Introduction to the FCV18-01/02 Single-Phase Voltage Relay

The FCV18-01/02 is a high-performance single-phase voltage relay designed to provide reliable protection against overvoltage and undervoltage conditions in electrical systems. Available in two models—FCV18-01 with manual resetting and FCV18-02 with auto resetting—this versatile relay offers comprehensive monitoring capabilities for a wide range of applications across industrial, commercial, and residential settings.

With its advanced monitoring features and robust construction, the FCV18-01/02 single-phase voltage relay ensures optimal protection for valuable electrical equipment, preventing damage caused by voltage fluctuations and improving overall system reliability.

Key Features of the FCV18-01/02 Single-Phase Voltage Relay

Comprehensive Voltage Monitoring: Continuous monitoring for both overvoltage and undervoltage conditions
Versatile Power Supply: Wide operating range from 12V to 240V AC/DC
User-Friendly Installation: Easy setup with clear wiring diagrams printed on the product
Enhanced Protection: Strong anti-interference capability ensuring reliable operation in noisy electrical environments
Two Model Options:
- FCV18-01: Manual resetting functionality
- FCV18-02: Auto resetting functionality with adjustable hysteresis
Visual Status Indicators: Green LED for supply indication and red LED for relay status
Precision Control: Adjustable time delay and voltage thresholds with high accuracy
Compact Design: Space-saving dimensions of 90mm×18mm×64mm, perfect for DIN rail mounting

Technical Specifications of the FCV18-01/02 Single-Phase Voltage Relay

Specifications
Input Terminal	A1-A2
Voltage Range	AC 230V / DC24V / AC/DC 12-240V
Power Consumption	AC 3.5VA/ DC 2.0W
Voltage Tolerance	-15% ~ +10%
Supply Indication	Green LED
Relay Indication	Red LED
Time Range	0.1s-20s
Setting Method	Button
Setting Deviation	0.1%
Measurement Accuracy	≤1% / ±1V
Temperature Coefficient	0.05%/°C, at=20°C (0.05%/°F, =68°F)
Output Contact	1×SPDT
Rated Current	1×16A
Mechanical Life	1×10⁷
Electrical Life	1×10⁵
Ambient Temperature	-20 … +60 °C / -40 … +85 °C
Mounting	DIN rail EN/IEC 60715
IP Rating	IP20
Stripping Length	7mm (0.28in)
Installed Altitude	≤2200m
Pollution Level	2
Max Cable Size	AWG13-20 0.4N·m
Dimensions	90mm×18mm×64mm
Weight	About 90g
Standards	GB/T 14048.5, IEC60947-5-1, EN6812-1

FCV18-01/02 Voltage Relay Models: Understanding the Differences

FCV18-01: Manual Resetting Single-Phase Voltage Relay

The FCV18-01 model provides manual resetting functionality, making it ideal for applications where human intervention is preferred or required after a voltage event. This model offers precise control over voltage thresholds with adjustable Umax and Umin settings, along with a configurable time delay (Tt) for response customization.

When the monitored voltage exceeds the set Umax or falls below the set Umin threshold for longer than the defined time delay, the relay changes state. To resume normal operation after a trip, manual resetting is required, ensuring that the system is not automatically restarted without proper verification.

FCV18-02: Auto Resetting Single-Phase Voltage Relay with Hysteresis

The FCV18-02 model offers auto resetting functionality with adjustable hysteresis (H), providing enhanced protection for systems that require automatic recovery. This model is particularly valuable in remote locations or applications where immediate recovery is preferred after voltage conditions return to normal.

The auto-resetting feature includes programmable hysteresis, creating separate recovery thresholds (Umax*(1-H)% for overvoltage and Umin*(1+H)% for undervoltage) that prevent rapid cycling of the relay when voltage fluctuates near the threshold values. It’s important to ensure that Umax > Umax*(1-H)% > Umin*(1+H)% > Umin for proper operation.

VIOX FCV18-01_02 Single-Phase Voltage Relay front

Voltage Setting Options for FCV18-01/02 Single-Phase Voltage Relays

The FCV18-01/02 single-phase voltage relay offers flexible voltage setting options to accommodate various electrical systems:

Voltage Settings
Code	Setting Voltage	Monitoring Voltage
A48	AC20-80V	AC15-100V
A220	AC165-260V	AC140-270V
A240	AC65-260V	AC50-270V
D12	DC9-18V	DC7-25V
D48	DC20-80V	DC15-100V
D240	DC65-260V	DC50-270V

When ordering, use the model code format FCV18-XX-YZZ, where:

XX: Function type (01 for manual resetting, 02 for auto resetting)
Y: Supply voltage (A for AC, D for DC, W for AC/DC)
ZZ: Voltage range (48, 220, 240, 12, etc.)

For example, FCV18-01-A240 indicates a manual resetting model with AC65-260V setting range.

Function Chart: Understanding Operational Behavior

VIOX FCV18-01_02 Single-Phase Voltage Relay function chart

FCV18-01 (Manual Resetting) Operation

The function chart for the FCV18-01 model illustrates how the relay responds to voltage fluctuations:

When input voltage (Un) exceeds Umax or falls below Umin for a period longer than the time delay (Tt), the relay changes state
The relay maintains this state until manually reset, even if voltage returns to the normal range
Time delay (Tt) provides protection against momentary voltage fluctuations

FCV18-02 (Auto Resetting) Operation

The function chart for the FCV18-02 model demonstrates its auto-resetting behavior with hysteresis:

When input voltage (Un) exceeds Umax or falls below Umin for a period longer than the time delay (Tt), the relay changes state
The relay automatically resets when voltage returns to Umax*(1-H)% (for overvoltage) or Umin*(1+H)% (for undervoltage)
Hysteresis (H) setting prevents relay chatter when voltage fluctuates near threshold values
Important: Always ensure Umax > Umax*(1-H)% > Umin*(1+H)% > Umin

Wiring and Installation Guidelines

Proper wiring is essential for the reliable operation of the FCV18-01/02 single-phase voltage relay:

VIOX FCV18-01_02 Single-Phase Voltage Relay wiring

Power Connection: Connect power supply to terminals A1 and A2
Output Connection: Connect controlled device to terminals 14 (normally open), 11 (common), and 12 (normally closed)
DIN Rail Mounting: Install the relay on a standard DIN rail EN/IEC 60715
Environmental Considerations: Ensure installation location meets the specified ambient temperature range (-20 to +60°C for operation)
Cable Selection: Use appropriate cable size (AWG13-20) with proper stripping length (7mm)

Applications of the FCV18-01/02 Single-Phase Voltage Relay

The FCV18-01/02 single-phase voltage relay is suitable for a wide range of applications across various industries:

Industrial Applications

Protection of sensitive manufacturing equipment
Motor protection against voltage fluctuations
Control systems for industrial processes
Automation equipment protection
Industrial power distribution systems

Commercial Applications

HVAC system protection
Commercial refrigeration equipment
Office equipment protection
Building management systems
Elevator and escalator control systems

Residential Applications

Home appliance protection
Residential power systems
Smart home systems
Solar power installations
Backup power systems

Specialized Applications

Telecommunications equipment protection
Medical equipment safeguarding
Laboratory instruments
Agriculture and irrigation systems
Remote monitoring stations

Benefits of Using the FCV18-01/02 Single-Phase Voltage Relay

Equipment Protection

The primary benefit of implementing the FCV18-01/02 single-phase voltage relay is the protection of valuable electrical equipment from damage caused by voltage fluctuations. By monitoring for both overvoltage and undervoltage conditions, the relay can prevent costly equipment failures and extend the operational lifespan of connected devices.

System Reliability

With its precise voltage monitoring and quick response time, the FCV18-01/02 significantly improves system reliability by preventing unexpected shutdowns and equipment malfunctions. The adjustable time delay feature allows for customization based on specific application requirements, filtering out momentary fluctuations while responding appropriately to sustained voltage issues.

Cost Savings

By protecting equipment from voltage-related damage, the FCV18-01/02 single-phase voltage relay helps reduce maintenance costs, prevent production downtime, and extend equipment lifespan. This translates to significant cost savings over time, making it a wise investment for any electrical system.

Easy Setup and Operation

The user-friendly design of the FCV18-01/02, with its clear wiring diagrams and simple adjustment mechanisms, ensures easy installation and operation. This reduces setup time and minimizes the possibility of installation errors, allowing for quick implementation in various applications.

Comparison: FCV18-01 vs. FCV18-02 Single-Phase Voltage Relays

Feature	FCV18-01	FCV18-02
Resetting Method	Manual	Automatic
Hysteresis	Fixed	Adjustable (H setting)
Best For	Applications requiring human verification before restart	Remote locations and systems needing automatic recovery
Recovery Thresholds	N/A (manual reset required)	Umax(1-H)% and Umin(1+H)%
Adjustment Controls	Umax, Umin, Tt	Umax, Umin, Tt, H

Maintenance and Troubleshooting

The FCV18-01/02 single-phase voltage relay requires minimal maintenance due to its robust design and high-quality components. However, periodic checks are recommended to ensure optimal performance:

Routine Maintenance

Visually inspect the relay for any signs of damage or overheating
Check connection terminals for tightness
Verify LED indicators are functioning properly
Test relay operation periodically in systems where infrequent activation occurs

Troubleshooting Common Issues

Relay Not Activating: Check power supply connections and verify voltage is within operating range
Frequent Tripping: Adjust time delay (Tt) or hysteresis (H) settings for less sensitivity to brief fluctuations
No LED Indicators: Verify power connection and check for internal fuse issues
Unexpected Auto-Reset: For FCV18-02, check hysteresis settings and ensure proper threshold hierarchy

Ordering Information

To order the FCV18-01/02 single-phase voltage relay, use the following model code format:

FCV18-XX-YZZ

Where:

XX: Function type
- 01 = Manual resetting
- 02 = Auto resetting
Y: Supply voltage
- A = AC voltage
- D = DC voltage
- W = AC/DC voltage
ZZ: Voltage range
- 48 = 20-80V range
- 220 = 165-260V range
- 240 = 65-260V range
- 12 = 9-18V range (DC only)

Example: FCV18-01-A240 W indicates a manual resetting relay with AC/DC 12-240V wide range power supply.

Conclusion

The FCV18-01/02 single-phase voltage relay represents a reliable and versatile solution for voltage protection across diverse applications. With its comprehensive monitoring capabilities, flexible configuration options, and robust design, this relay offers exceptional value for protecting electrical systems and equipment from voltage-related damage.

Whether you choose the manual resetting FCV18-01 model for applications requiring human verification or the auto-resetting FCV18-02 model with hysteresis for automatic recovery, you’ll benefit from precise voltage monitoring, easy installation, and long-term reliability.

By integrating the FCV18-01/02 single-phase voltage relay into your electrical systems, you can significantly reduce the risk of equipment damage, minimize downtime, and enhance overall system reliability—making it an essential component for any comprehensive electrical protection strategy.

Note: The above information is subject to change without further notice. Always refer to the latest product documentation for the most up-to-date specifications.

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