Electrical Full Forms, explained for real systems.
Search 147 essential abbreviations used in circuit protection, switching, motor control, automation, power distribution, solar, wiring, measurement, and standards.
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Ampere
The SI unit of electric current.
- Τυπική χρήση
- Current ratings, measurements, calculations, and equipment specifications.
Air-Break Switch
A switch that opens contacts in air to provide visible circuit interruption.
- Τυπική χρήση
- Manual switching and isolation in suitable distribution applications.
Εναλλασσόμενο ρεύμα
Electric current that periodically reverses direction.
- Τυπική χρήση
- Utility supplies, motors, transformers, and building distribution.
Διακόπτης Αέρα
A low-voltage circuit breaker that uses air as the arc-extinguishing medium.
- Τυπική χρήση
- Main incomers, large distribution boards, and industrial switchboards.
Alternating-Current Distribution Board
A board that distributes and protects alternating-current circuits.
- Τυπική χρήση
- Building, industrial, and renewable-energy AC distribution.
Arc-Fault Circuit Interrupter
A protective device intended to detect hazardous arcing patterns and interrupt the circuit.
- Τυπική χρήση
- Branch circuits where arc-fault protection is required by the applicable code.
Συσκευή Ανίχνευσης Σφάλματος Τόξου (Arc Fault Detection Device)
A device that detects characteristic electrical arcing and disconnects the affected circuit.
- Τυπική χρήση
- Final circuits where reducing the risk associated with electrical arcs is required.
Analog Input
A controller input that reads a continuously variable electrical signal.
- Τυπική χρήση
- Temperature, pressure, level, flow, and position measurement.
Ampere Interrupting Capacity
The maximum fault current a protective device is rated to interrupt under stated conditions.
- Τυπική χρήση
- Comparing protective-device capability with the available fault current.
Αμερικανικό Εθνικό Ινστιτούτο Προτύπων
A US organization that coordinates voluntary consensus standards and conformity-assessment activities.
- Τυπική χρήση
- North American engineering specifications and standards references.
Analog Output
A controller output that sends a continuously variable electrical signal.
- Τυπική χρήση
- Speed references, valve commands, and process-control setpoints.
Αυτόματος Ελεγκτής Συντελεστή Ισχύος
A controller that switches correction stages to maintain a target power factor.
- Τυπική χρήση
- Capacitor banks in commercial and industrial installations.
Αυτόματος διακόπτης μεταφοράς
A switching assembly that automatically transfers a load between available power sources.
- Τυπική χρήση
- Utility-generator, dual-supply, and backup-power systems.
American Wire Gauge
A standardized conductor-size system widely used in North America.
- Τυπική χρήση
- Cable selection, terminal compatibility, and conductor documentation.
Break Before Make
A contact sequence in which the existing connection opens before the new connection closes.
- Τυπική χρήση
- Changeover switches where sources or circuits must not overlap.
Σύστημα Αποθήκευσης Ενέργειας σε Μπαταρίες
An integrated system that stores electrical energy in batteries and returns it when required.
- Τυπική χρήση
- Solar self-consumption, peak management, backup power, and grid services.
Battery Electric Vehicle
A vehicle propelled only by electric motors using energy stored in a rechargeable battery.
- Τυπική χρήση
- AC and DC charging infrastructure and energy-management planning.
Brushless Direct-Current Motor
A permanent-magnet motor electronically commutated without mechanical brushes.
- Τυπική χρήση
- Fans, pumps, automation, and variable-speed equipment.
Battery Management System
An electronic system that monitors and manages battery operation and protection functions.
- Τυπική χρήση
- Battery packs, stationary storage, and electric vehicles.
Διακόπτης κυκλώματος
A switching device capable of making, carrying, and interrupting current under specified circuit conditions.
- Τυπική χρήση
- Circuit protection and controlled isolation in distribution systems.
Καλώδιο Αδένα
A fitting that secures and seals a cable where it enters an enclosure.
- Τυπική χρήση
- Panels, junction boxes, machinery, and outdoor equipment.
Κύκλωμα
A common abbreviation for an electrical circuit in drawings and schedules.
- Τυπική χρήση
- Panel schedules, schematics, single-line diagrams, and field notes.
Current-Limiting Fuse
A fuse designed to limit the magnitude and duration of fault current.
- Τυπική χρήση
- Protection where limiting let-through energy helps coordinate downstream equipment.
Circuit Protective Conductor
A protective conductor connecting exposed conductive parts to the earthing arrangement.
- Τυπική χρήση
- Fault-current paths and protective bonding in electrical installations.
Επιφάνεια Διατομής
The area of a conductor cross section, commonly expressed in square millimetres.
- Τυπική χρήση
- Conductor sizing, voltage-drop assessment, and terminal selection.
Μετασχηματιστής Ρεύματος
An instrument transformer that provides a scaled current for measurement or protection.
- Τυπική χρήση
- Meters, relays, monitoring systems, and protective schemes.
Πίνακας διανομής
An assembly that divides an incoming electrical supply into protected outgoing circuits.
- Τυπική χρήση
- Residential, commercial, and industrial final distribution.
Συνεχές ρεύμα
Electric current that flows with a consistent polarity.
- Τυπική χρήση
- Batteries, solar arrays, electronics, control circuits, and EV systems.
Direct-Current Miniature Circuit Breaker
A miniature circuit breaker designed and rated for direct-current circuit interruption.
- Τυπική χρήση
- Photovoltaic, battery, telecom, and other DC branch circuits.
Direct-Current Surge Protective Device
A surge protective device designed for direct-current system voltage and fault behavior.
- Τυπική χρήση
- PV strings, combiner boxes, battery systems, and DC distribution.
Direct-Current Distribution Board
A board that distributes and protects direct-current circuits.
- Τυπική χρήση
- Solar, battery, telecom, and industrial DC systems.
Distributed Control System
A process-control architecture distributing control functions across connected controllers.
- Τυπική χρήση
- Continuous and complex industrial processes.
Digital Input
A controller input that reads a discrete on-off state.
- Τυπική χρήση
- Limit switches, push buttons, alarms, and equipment status.
Deutsches Institut für Normung
The German Institute for Standardization; DIN is also commonly associated with standardized rail mounting.
- Τυπική χρήση
- DIN-rail components, dimensions, and German standards references.
Ψηφιακό Πολύμετρο
An electronic instrument used to measure quantities such as voltage, current, and resistance.
- Τυπική χρήση
- Installation testing, troubleshooting, commissioning, and maintenance.
Digital Output
A controller output that commands a discrete on-off state.
- Τυπική χρήση
- Relays, contactors, indicators, solenoids, and alarms.
Direct-On-Line Starter
A motor-starting method that applies the supply voltage directly to the motor terminals.
- Τυπική χρήση
- Motors where the starting current and mechanical impact are acceptable.
Double Pole, Double Throw
A switch arrangement controlling two poles between two output positions.
- Τυπική χρήση
- Polarity reversal, changeover, and paired-circuit selection.
Double Pole, Single Throw
A switch arrangement that opens or closes two poles together.
- Τυπική χρήση
- Simultaneous isolation of two conductors.
Earth Leakage Circuit Breaker
A legacy term for a device used to disconnect a circuit when earth-leakage conditions are detected.
- Τυπική χρήση
- Older installations and historical discussions of leakage protection.
Electromagnetic Compatibility
The ability of equipment to operate acceptably without causing or suffering unacceptable electromagnetic disturbance.
- Τυπική χρήση
- Panel design, cable routing, shielding, filtering, and compliance work.
Electromagnetic Interference
Unwanted electromagnetic energy that degrades the operation of equipment or signals.
- Τυπική χρήση
- Industrial controls, drives, communication wiring, and sensitive electronics.
Electromechanical Relay
A relay that uses an energized coil to move mechanical contacts.
- Τυπική χρήση
- Isolation, interlocking, signaling, and general control logic.
Electrical Metallic Tubing
A thin-wall metallic raceway used to route and protect electrical conductors.
- Τυπική χρήση
- Commercial and industrial wiring installations.
Electronic Overcurrent Relay
An electronic relay that monitors motor current and trips or signals under configured abnormal conditions.
- Τυπική χρήση
- Motor overload, phase-loss, and current-monitoring protection.
Energy Storage System
A system that stores energy for later electrical use.
- Τυπική χρήση
- Renewable integration, backup, load shifting, and grid support.
Electric Vehicle
A vehicle propelled partly or entirely by electrical energy.
- Τυπική χρήση
- Charging equipment, electrical infrastructure, and energy management.
Electric Vehicle Supply Equipment
Equipment that safely supplies electrical energy to an electric vehicle for charging.
- Τυπική χρήση
- Residential, commercial, fleet, and public charging installations.
Fuel Cell Electric Vehicle
An electric vehicle that generates electrical energy onboard using a fuel cell.
- Τυπική χρήση
- Hydrogen mobility and related charging or fueling infrastructure context.
Full-Load Amperes
The current drawn by equipment when operating at its stated full-load condition.
- Τυπική χρήση
- Motor, conductor, starter, and overload-device selection.
Flexible Metal Conduit
A flexible metallic raceway used to route conductors where movement or difficult geometry is present.
- Τυπική χρήση
- Machinery connections, equipment tails, and vibration-prone locations.
Flame Retardant Low Smoke
A cable-material designation indicating flame-retardant and reduced-smoke characteristics.
- Τυπική χρήση
- Buildings and enclosed areas subject to specified fire-performance requirements.
Ground-Fault Circuit Interrupter
A device that disconnects a circuit when current imbalance indicates leakage to ground.
- Τυπική χρήση
- North American shock-protection applications, particularly around wet locations.
Gas-Insulated Switchgear
Switchgear using insulating gas within an enclosed assembly.
- Τυπική χρήση
- Compact medium- and high-voltage substations; terminology is included for system context.
Highway Addressable Remote Transducer
A communication protocol that superimposes digital information on a conventional analog signal.
- Τυπική χρήση
- Smart process instruments and asset configuration.
Human-Machine Interface
A user interface for monitoring and controlling machines or processes.
- Τυπική χρήση
- Control panels, production lines, utilities, and building systems.
Hand-Off-Automatic
A three-position selector arrangement for manual, disabled, or automatic control.
- Τυπική χρήση
- Pump, fan, and motor-control panels.
High Rupturing Capacity
A fuse classification associated with safely interrupting high prospective fault currents.
- Τυπική χρήση
- Industrial feeders, distribution equipment, and coordinated fuse protection.
Hertz
The SI unit of frequency, equal to one cycle per second.
- Τυπική χρήση
- AC supply frequency, motor speed relationships, and signal measurement.
Input/Output
The signals and interfaces through which a controller receives information and issues commands.
- Τυπική χρήση
- PLCs, remote I/O stations, drives, and machine controllers.
Διεθνής Ηλεκτροτεχνική Επιτροπή
The international standards organization for electrical, electronic, and related technologies.
- Τυπική χρήση
- Electrotechnical terminology, product standards, testing, and system design.
Ινστιτούτο Ηλεκτρολόγων και Ηλεκτρονικών Μηχανικών
A global professional organization that develops standards and publishes technical research.
- Τυπική χρήση
- Power systems, electronics, communications, computing, and engineering practice.
Προστασία από εισβολή
A classification describing enclosure protection against access, solid objects, and water under the applicable standard.
- Τυπική χρήση
- Selecting enclosures, glands, switches, and equipment for the installation environment.
International Organization for Standardization
An independent international organization that develops consensus-based standards across industries.
- Τυπική χρήση
- Quality systems, management standards, terminology, and cross-industry specifications.
Κιβώτιο Συνδέσεων
An enclosure that contains and protects electrical connections.
- Τυπική χρήση
- Branching, terminating, and protecting wiring connections.
Kiloampere
A unit of electric current equal to one thousand amperes.
- Τυπική χρήση
- Fault-current levels and interrupting-capacity ratings.
Kirchhoff’s Current Law
The algebraic sum of currents at an electrical node is zero.
- Τυπική χρήση
- Circuit analysis, protection studies, and electrical calculations.
Kilovolt-Ampere
A unit of apparent power equal to one thousand volt-amperes.
- Τυπική χρήση
- Transformer, generator, UPS, and system-capacity ratings.
Kilovolt-Ampere Reactive
A unit of reactive power equal to one thousand volt-amperes reactive.
- Τυπική χρήση
- Capacitor-bank sizing and power-factor correction.
Kirchhoff’s Voltage Law
The algebraic sum of voltages around a closed electrical loop is zero.
- Τυπική χρήση
- Circuit analysis, voltage-drop calculations, and troubleshooting.
Κιλοβάτ
A unit of active power equal to one thousand watts.
- Τυπική χρήση
- Load demand, motor output, generation, and equipment ratings.
Kilowatt-Hour
A unit of energy equal to one kilowatt of power used for one hour.
- Τυπική χρήση
- Electricity billing, energy monitoring, and consumption analysis.
Διακόπτης φορτίου
A switch designed to make and break normal load current within its rating.
- Τυπική χρήση
- Feeder isolation and controlled load switching.
Light-Dependent Resistor
A resistive sensor whose resistance changes with incident light level.
- Τυπική χρήση
- Daylight sensing, lighting control, and optical detection.
Liquidtight Flexible Metal Conduit
A flexible metallic raceway with an outer covering intended to limit liquid ingress.
- Τυπική χρήση
- Outdoor, wet, and industrial equipment connections where permitted.
Locked-Rotor Amperes
The current drawn by a motor when the rotor is stationary and rated voltage is applied.
- Τυπική χρήση
- Starting-current assessment and protective-device coordination.
Low Smoke Zero Halogen
A cable-material designation intended to produce limited smoke and no halogen acid gas under specified fire conditions.
- Τυπική χρήση
- Transport, public buildings, data facilities, and confined spaces.
Make Before Break
A contact sequence in which the new connection closes before the existing connection opens.
- Τυπική χρήση
- Selected transfer or signal applications where brief continuity is required.
Μικροσκοπικός διακόπτης κυκλώματος
A compact resettable breaker that protects circuits against overload and short-circuit current.
- Τυπική χρήση
- Final and branch circuits in residential, commercial, and light-industrial distribution.
Κέντρο Ελέγχου Κινητήρα
An assembly containing coordinated motor-control and protection units.
- Τυπική χρήση
- Centralized control of multiple motors in industrial facilities.
Μορφοποιημένος διακόπτης κυκλώματος
A circuit breaker in a molded insulating case, generally used for higher-current distribution and adjustable protection.
- Τυπική χρήση
- Feeders, machinery, and commercial or industrial distribution systems.
Main Distribution Board
The principal low-voltage board distributing power to downstream boards and major loads.
- Τυπική χρήση
- Commercial buildings, industrial plants, and infrastructure.
Motor Protection Circuit Breaker
A circuit breaker designed around motor overload and short-circuit protection requirements.
- Τυπική χρήση
- Motor starters, pumps, fans, conveyors, and machinery.
Maximum Power Point Tracking
A control method that keeps a photovoltaic source operating near its maximum available power point.
- Τυπική χρήση
- Solar inverters, charge controllers, and PV conversion systems.
Main Switchboard
The main assembly containing incoming switching, protection, metering, and outgoing feeders.
- Τυπική χρήση
- Facility-level low-voltage power distribution.
Χειροκίνητος Διακόπτης Μεταφοράς
A manually operated device that transfers a load between power sources.
- Τυπική χρήση
- Backup-power systems where source transfer is performed by an operator.
Κανονικά Κλειστή
A contact state that is closed when the operating device is in its normal, unactuated condition.
- Τυπική χρήση
- Control circuits, interlocks, alarms, and fail-safe logic.
Εθνική Ένωση Κατασκευαστών Ηλεκτρικών Συσκευών
A North American industry association whose standards include enclosure-type classifications.
- Τυπική χρήση
- Equipment specifications, enclosure selection, and North American market context.
Κανονικά Ανοιχτή
A contact state that is open when the operating device is in its normal, unactuated condition.
- Τυπική χρήση
- Start commands, signaling, relay logic, and controlled switching.
Negative Temperature Coefficient
A thermistor characteristic in which resistance decreases as temperature rises.
- Τυπική χρήση
- Temperature sensing, compensation, and inrush-current limiting.
Overcurrent Protective Device
A general term for a device that opens a circuit when current exceeds a defined limit.
- Τυπική χρήση
- Circuit breakers, fuses, and coordinated overcurrent-protection schemes.
Open-Circuit Voltage
The voltage measured across a source when no load current is flowing.
- Τυπική χρήση
- PV string checks, battery assessment, and source characterization.
Ρελέ Υπερφόρτωσης
A relay that responds to sustained motor overcurrent and opens the control circuit.
- Τυπική χρήση
- Contactor-based motor starters and coordinated motor protection.
Point of Common Coupling
The electrical point where a customer system or multiple loads connect to a shared supply.
- Τυπική χρήση
- Power-quality assessment, distributed generation, and grid interconnection.
Power Conversion System
Bidirectional conversion equipment linking energy storage with AC or DC systems.
- Τυπική χρήση
- Battery storage, microgrids, and renewable-energy integration.
Power Distribution Board
A panel assembly used to distribute power among multiple circuits or loads.
- Τυπική χρήση
- Industrial panels, buildings, and equipment distribution.
Protective Earth
A conductor or terminal provided for protective earthing.
- Τυπική χρήση
- Electrical safety, bonding, and fault-current return paths.
Protective Earth and Neutral
A conductor combining protective-earth and neutral functions in a defined part of an earthing system.
- Τυπική χρήση
- Specific supply and earthing arrangements where permitted.
Συντελεστής Ισχύος
The ratio of active power to apparent power in an AC system.
- Τυπική χρήση
- Load assessment, capacitor-bank control, and power-quality management.
Proportional-Integral-Derivative
A feedback-control method combining proportional, integral, and derivative actions.
- Τυπική χρήση
- Temperature, pressure, flow, speed, and position control.
Passive Infrared
A sensing method that detects changes in infrared radiation from people or objects.
- Τυπική χρήση
- Occupancy detection, lighting control, and security systems.
Programmable Logic Controller
An industrial controller designed to execute logic and manage machine or process I/O.
- Τυπική χρήση
- Automation, sequencing, interlocking, and machine control.
Permanent-Magnet Synchronous Motor
A synchronous motor whose rotor magnetic field is produced by permanent magnets.
- Τυπική χρήση
- High-efficiency variable-speed drives and precision motion systems.
Potential Transformer
An instrument transformer that provides a scaled voltage for measurement or protection.
- Τυπική χρήση
- Meters, protection relays, synchronizing, and monitoring.
Positive Temperature Coefficient
A resistive characteristic in which resistance increases as temperature rises.
- Τυπική χρήση
- Temperature sensing and equipment protection.
Photovoltaic
The direct conversion of light into electrical energy using semiconductor devices.
- Τυπική χρήση
- Solar modules, arrays, inverters, and DC protection systems.
Polyvinyl Chloride
A thermoplastic material widely used for cable insulation, sheathing, conduit, and enclosures.
- Τυπική χρήση
- General electrical wiring and installation products.
Διακόπτης Υπολειπόμενου Ρεύματος
An informal or legacy expression for a breaker responding to residual current.
- Τυπική χρήση
- General discussions where the exact RCD, RCCB, or RCBO device type must be clarified.
Διακόπτης Υπολειπόμενου Ρεύματος με Προστασία από Υπερένταση
A protective device combining residual-current protection with overload and short-circuit protection.
- Τυπική χρήση
- Individual final circuits requiring combined protection in one device.
Διακόπτης Διαρροής Ρεύματος
A breaker that disconnects a circuit when residual current exceeds its operating threshold.
- Τυπική χρήση
- Earth-leakage and shock-protection applications; separate overcurrent protection may be required.
Συσκευή Ρεύματος Διαρροής
The umbrella term for devices that monitor current imbalance and disconnect a circuit when necessary.
- Τυπική χρήση
- Residual-current protection across residential, commercial, and industrial installations.
Reversing Direct-On-Line Starter
A starter arrangement that reverses motor direction by changing the phase sequence.
- Τυπική χρήση
- Conveyors, hoists, doors, and machinery requiring forward-reverse operation.
Rigid Metal Conduit
A heavy-wall metallic raceway providing mechanical protection for conductors.
- Τυπική χρήση
- Industrial, outdoor, and exposed wiring installations.
Root Mean Square
A method of expressing the effective magnitude of a varying electrical quantity.
- Τυπική χρήση
- AC voltage and current measurement and equipment ratings.
Μονάδα Δακτυλιοειδούς Δικτύου (Ring Main Unit)
A compact switchgear assembly used in ring-type medium-voltage distribution networks.
- Τυπική χρήση
- Utility and industrial distribution; included for broader system context.
Resistance Temperature Detector
A temperature sensor that uses the predictable resistance change of a metal element.
- Τυπική χρήση
- Industrial process and equipment temperature measurement.
Remote Terminal Unit
A field device that gathers data and communicates with a supervisory control system.
- Τυπική χρήση
- Utilities, substations, pipelines, and geographically distributed assets.
Supervisory Control and Data Acquisition
A system for supervisory monitoring, data collection, alarms, and remote control.
- Τυπική χρήση
- Industrial plants, utilities, water systems, and infrastructure.
Squirrel-Cage Induction Motor
An induction motor with rotor conductors arranged in a short-circuited cage structure.
- Τυπική χρήση
- Pumps, fans, compressors, conveyors, and general industrial drives.
Switch Fuse Unit
A switching unit combining load isolation with fuse protection.
- Τυπική χρήση
- Distribution feeders and equipment requiring manual isolation and fused protection.
State of Charge
An estimate of the energy remaining in a battery relative to its usable capacity.
- Τυπική χρήση
- Battery monitoring, storage dispatch, and electric vehicles.
Solid-State Motor Soft Starter
A controller that ramps motor voltage to reduce starting current and mechanical shock.
- Τυπική χρήση
- Pumps, fans, conveyors, and equipment that needs controlled acceleration.
State of Health
An estimate of a battery’s present condition relative to its initial performance.
- Τυπική χρήση
- Battery maintenance, warranty assessment, and lifecycle planning.
Συσκευή Προστασίας από Υπερτάσεις
A device that limits transient overvoltage and diverts surge current.
- Τυπική χρήση
- Distribution boards, control panels, solar systems, and sensitive equipment.
Single Pole, Double Throw
A switch arrangement connecting one common pole to either of two outputs.
- Τυπική χρήση
- Changeover control, selector circuits, and relay contacts.
Single Pole, Single Throw
A basic switch arrangement that opens or closes one circuit path.
- Τυπική χρήση
- Simple on-off control.
Slip-Ring Induction Motor
A wound-rotor induction motor using slip rings to connect external rotor circuitry.
- Τυπική χρήση
- High-starting-torque and controlled-acceleration applications.
Solid-State Relay
An electronic switching device with no moving power contacts.
- Τυπική χρήση
- High-cycle switching, temperature control, and silent operation.
Στατικός διακόπτης μεταφοράς
A solid-state switching system that transfers a load between compatible power sources.
- Τυπική χρήση
- Critical loads requiring rapid source transfer.
Steel Wire Armour
Steel-wire reinforcement used to provide mechanical protection around a cable.
- Τυπική χρήση
- Power cables installed underground, outdoors, or in demanding environments.
Ηλεκτρικός πίνακας (Switchboard)
An assembly of switching, protection, control, and metering equipment for power distribution.
- Τυπική χρήση
- Commercial and industrial low-voltage distribution.
Πίνακες διανομής
A collective term for switching, protection, control, and isolation equipment.
- Τυπική χρήση
- Power-system distribution and equipment protection.
Τελικός Φραγμός
A modular insulated component used to terminate and interconnect conductors.
- Τυπική χρήση
- Control panels, distribution boards, machinery, and field wiring.
Totally Enclosed Fan Cooled
A motor enclosure arrangement that limits free air exchange and uses an external fan for cooling.
- Τυπική χρήση
- Industrial environments where dust and moisture exposure must be considered.
Total Harmonic Distortion
A measure comparing harmonic content with the fundamental component of a waveform.
- Τυπική χρήση
- Power-quality analysis, drives, inverters, and nonlinear loads.
Three Pole and Neutral
A distribution arrangement with three phase conductors and a neutral conductor.
- Τυπική χρήση
- Three-phase boards, switches, and distribution systems.
Transient Voltage Suppressor
A component or device used to clamp short-duration voltage transients.
- Τυπική χρήση
- Electronic circuits, signal interfaces, and localized surge suppression.
Εργαστήρια Ασφαλιστών
A safety science organization associated with standards, testing, and certification services.
- Τυπική χρήση
- North American product requirements and conformity-assessment context.
Αδιάλειπτη Παροχή Ενέργειας
A power system that provides immediate temporary supply when the normal source is interrupted.
- Τυπική χρήση
- Controls, IT loads, telecom, safety systems, and other critical equipment.
Volt
The SI-derived unit of electric potential difference.
- Τυπική χρήση
- Voltage ratings, measurements, and electrical calculations.
Volt-Ampere
A unit of apparent power in an AC circuit.
- Τυπική χρήση
- Transformer, UPS, generator, and load-capacity ratings.
Volt-Ampere Reactive
A unit of reactive power in an AC system.
- Τυπική χρήση
- Power-factor studies and reactive-power compensation.
Μετατροπέας Μεταβλητής Συχνότητας
A power-electronic drive that controls AC motor speed and torque by varying supply frequency and voltage.
- Τυπική χρήση
- Pumps, fans, HVAC systems, conveyors, and process machinery.
Variable Speed Drive
A general term for a drive system that controls motor operating speed.
- Τυπική χρήση
- Motor-driven processes requiring adjustable speed or torque.
Variable Voltage Variable Frequency
A control method that varies both voltage and frequency for AC motor operation.
- Τυπική χρήση
- Elevators, HVAC, traction, and industrial motor drives.
Watt
The SI-derived unit of active power.
- Τυπική χρήση
- Equipment consumption, output, heat loss, and electrical calculations.
Cross-Linked Polyethylene
A thermoset insulation material produced by cross-linking polyethylene.
- Τυπική χρήση
- Power and control cables requiring defined thermal and electrical performance.
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Common protection acronyms at a glance
These terms are frequently searched together, but each describes a different protection function.
| Όρος | Κύρια λειτουργία | Typical position |
|---|---|---|
| MCB | Προστασία από υπερφόρτωση και βραχυκύκλωμα | Final and branch circuits |
| MCCB | Προστασία υπερέντασης υψηλότερης χωρητικότητας | Feeders and larger distribution circuits |
| RCCB | Προστασία διαρροής ρεύματος | Circuits requiring leakage protection |
| RCBO | Residual-current and overcurrent protection | Individual final circuits |
| Ειδικό Πιστοποιητικό Πρόσβασης (SPD) | Transient overvoltage limitation | Distribution panels and sensitive systems |
| AFDD | Ανίχνευση σφάλματος τόξου | Final circuits where arc-fault risk is addressed |
How VIOX handles electrical terminology
Many abbreviations have more than one meaning, and voltage classes or device names can vary by standard and market. This hub uses the meaning most relevant to low-voltage electrical engineering and clearly labels broader system terms.
Definitions are checked against established engineering usage and terminology resources such as the IEC Electropedia. Always confirm the applicable standard, product documentation, and local requirements before specification.
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