⎯⎯ Timer Relay

Timer Relay for DIN Rail Control and Automation

VIOX timer relay products cover the practical timing functions most often used in control panels, machine sequencing, motor auxiliary logic, lighting control, ventilation timing, pump changeover, and automation circuits. The FCT18 range includes on-delay, off-delay, pulse, interval, bistable, flashing, and multifunction time relay options in a compact DIN rail format.

FCT18

Core timer relay platform

12-240V

AC/DC supply coverage

16A

Standard output contact rating

0.5%

Timing accuracy reference

⎯⎯ Overview

What Is a Timer Relay?

A timer relay, also called a time relay or time delay relay, is a control relay that changes contact state after a preset time interval. It is used when a circuit needs delayed switching, controlled release, cyclic output, flashing signal logic, sequence timing, or repeat interval control instead of immediate contact action.

In practical panel work, timer relays are selected by timing function first, then by control voltage, contact rating, mounting format, and application logic. This is especially important in automation cabinets, motor control circuits, lighting sequences, pump and fan systems, and compact DIN rail installations where timing behavior needs to be predictable and repeatable.

The VIOX FCT18 timer relay range is built around the most frequently used timing modes in industrial control. The focus stays on timer relay functions such as on-delay, off-delay, interval, pulse, flashing, and sequence timing so model comparison remains clear and application matching is faster.

Core Timer Relay Specifications

Product Platform	FCT18 timer relay series
Supply Voltage	AC/DC 12V to 240V
Output Rating	Typical 16A control contact
Timing Accuracy	Approx. ±0.5% reference
Repeat Accuracy	Approx. ±0.1% reference
Installation	DIN rail modular format

⎯⎯ Product Range

Core FCT18 Timer Relay Models

These timer relay models cover practical timing functions used in control panels, machine sequences, motor auxiliary logic, lighting, ventilation, and general automation applications.

Single Function

FCT18-Q Single Function Time Relay

Compact time relay for straightforward delay control when one stable timing function is preferred.

Pulse Delayed

FCT18-AR Pulse Delayed Timer Relay

Useful for controlled output after a pulse event where simple delay logic is required in automation sequences.

Interval

FCT18-BR Single Interval Timer Relay

Designed for one timed output interval in control circuits where a clean timed switching window is needed.

Off-Delay

FCT18-Bta Off-Delay Timer Relay

Suitable when output must remain active for a preset period after the control signal is removed.

Asymmetrical Delay

FCT18-WgR On-Delay and Off-Delay Timer Relay

Combines delay-on and delay-off behavior in one module for more flexible sequence timing logic.

Bistable

FCT18-CR Bistable Timer Relay

Applied where changeover logic with timing and controlled latching behavior is required in compact relay control.

Flashing

FCT18-BcR Asymmetrical Flashing Timer Relay

Used for warning signal, pulse lamp, and alternating flashing control where unequal on and off periods are needed.

Double Interval

FCT18-BD Double Interval Timer Relay

Designed for two-stage interval timing where a control process needs more than one defined timing block.

⎯⎯ Function Matrix

Timer Relay Function Coverage

Different timing functions are suited to different control tasks. This matrix makes it easier to compare the main timer relay function groups before confirming the exact model.

Series	Primary Timing Function	Best Fit
FCT18-A/At	General on-delay and pulse-delayed timing logic	Basic sequence delay, controlled start, and standard automation timing
FCT18-B/Bt	Off-delay and interval timing logic	Controlled stop timing, delayed release, and timed output windows
FCT18-M / N / X	Extended multifunction timing families	Applications that need broader timing mode choice in one DIN rail relay platform
FCT18-2T / S / P	Cycle, pulse, and specialized sequence timing	Repetitive control logic, periodic switching, and machine timing sequences
FCT18-RL / ST	Star-delta and application-specific timing modes	Motor auxiliary control and structured control sequence switching
AgR / AdR / AKR / AR / Ata	Pulse-delayed and control-signal-based timing	Projects needing trigger-based timing response and controlled actuation delay
WgR / Xd	Asymmetrical on-delay and off-delay timing	Systems requiring non-symmetrical timing behavior between energizing and release
BR / BgF / BD / CR / BcR / AcR	Interval, flashing, double interval, and bistable timing	Warning systems, cyclic signals, staged timing, and specialized panel control logic

⎯⎯ Selection Factors

Key Points for Timer Relay Selection

Timer relay selection usually comes down to a few practical points: timing function, supply voltage, output contact capability, and the way the control signal needs to behave in the circuit.

Timing Function Comes First

Timer relay selection normally begins with function type: on-delay, off-delay, interval, pulse, flashing, bistable, or multifunction timing.

Supply Voltage Must Match the Control Circuit

Wide AC/DC 12V-240V support helps the FCT18 platform fit common industrial control voltages and retrofit scenarios.

Output and Interface Should Fit the Load

Output contact rating, control signal type, and sequence logic should be checked against the actual switching task before confirming the model.

⎯⎯ Timing Logic

On-Delay, Off-Delay and Interval Timer Relay Functions

Function selection comes before voltage or dimensions. The three most frequently confused modes respond differently to power and control signals.

On-Delay Timer Relay

Timing starts when supply or the specified trigger is applied. The output changes state only after the preset time has elapsed.

INPUT ON -> WAIT T -> OUTPUT ON

Off-Delay Timer Relay

The output is active with the control signal. Removing the signal starts the delay; the output releases after the preset time.

SIGNAL OFF -> HOLD T -> OUTPUT OFF

Interval Timer Relay

The output activates when the timing cycle starts, remains active for the selected interval, then returns to its normal state.

TRIGGER -> OUTPUT ON FOR T -> OUTPUT OFF

Pulse / One-Shot

A trigger produces a defined output pulse. Confirm whether the selected model responds to a rising edge, falling edge or maintained control signal.

TRIGGER EDGE -> TIMED OUTPUT PULSE

Flashing / Cycle

The output alternates between ON and OFF periods. Symmetrical functions use equal periods; asymmetrical functions allow separate T1 and T2 settings.

ON T1 -> OFF T2 -> REPEAT

Multifunction Time Relay

One relay provides several selectable timing modes. Verify function code, timing chart and trigger behavior before replacing a single-function relay.

SELECT MODE + RANGE + TIME VALUE

⎯⎯ Applications

Where Timer Relays Are Used

Timer relay and time relay products are typically selected for control tasks where delay, interval, repeat timing, or sequence logic is required in a compact modular format.

Industrial Control Panels

Used for machine start sequencing, auxiliary relay timing, interlock delay, and signal transfer inside DIN rail control cabinets.

Motor and Fan Control

Useful in start-stop logic, controlled shutdown, star-delta timing, cooling fan run-on timing, and staged motor sequence control.

Lighting and Signaling

Applied when flashing, delayed light-off, pulse indication, or interval warning outputs are required in buildings or industrial installations.

⎯⎯ Connection Guide

Timer Relay Wiring and Terminal Identification

Use the wiring diagram printed on the exact relay or supplied datasheet. Terminal assignments vary by function, output count and NPN/PNP control option.

Terminal	Description
A1	Supply line or DC positive, according to model
A2	Supply neutral or DC negative, according to model
S / B1	External control or trigger input on applicable models
15	Common contact for one changeover output
16	Normally closed contact
18	Normally open contact

Connection Sequence

Confirm the nameplate.Check supply voltage, AC/DC type, timing function and output configuration before wiring.
Connect the supply.Wire A1 and A2 using the terminal diagram for the selected article number.
Connect the trigger when required.Control-signal models may use S or B1 and may require a defined NPN or PNP input arrangement.
Wire the output contact.Use COM, NO and NC contacts to switch the contactor coil, PLC input, indicator or other control load.
Set and test the function.Select the mode, range and time value, then verify operation under the actual control sequence.

Important: A timer relay output is normally used in a control circuit. Do not connect a motor or other power load directly unless the exact contact utilization category and load rating permit it. Use an appropriately rated contactor or interface relay where required.

⎯⎯ Specification Matrix

FCT18 Timer Relay Selection Parameters

The table organizes the information required for model selection. Final values must be confirmed against the datasheet for the exact article number.

Model / Family	Primary Function	Control Input	Supply Options	Output	Typical Selection Use
FCT18-Q	Single-function timing	Model dependent	Confirm article number	Confirm contact arrangement	Simple control sequence requiring one defined timing mode
FCT18-AR	Pulse-delayed timing	Control signal	Confirm article number	Confirm contact arrangement	Trigger-based automation and pulse timing
FCT18-BR	Single interval family	NPN/PNP options by article	12-240V AC/DC options	1 or 2 changeover options	Timed output window after a defined trigger event
FCT18-Bta	Off-delay with summation/control	Control signal	Confirm article number	Confirm contact arrangement	Fan run-on, delayed release and controlled stop logic
FCT18-WgR	Asymmetrical on/off delay	Control signal	Confirm article number	Confirm contact arrangement	Independent energizing and release timing
FCT18-BD	Double interval	Control signal	Confirm article number	Confirm contact arrangement	Two-stage interval and sequenced timing
FCT18-M / N / X	Multifunction timing	Depends on selected mode	Confirm article number	Confirm contact arrangement	Panels that need several selectable timing functions

Available voltage, timing range, accuracy, contact rating, terminal numbering and conformity documents are model-specific. Confirm the complete ordering code before purchasing or substituting a relay.

⎯⎯ Selection

How to Choose the Right Time Relay

The timer relay range can be reviewed by function family, related relay type, or application requirement, depending on how the control circuit is structured.

Project Details That Matter Most

Required timing function: on-delay, off-delay, interval, pulse, flashing, bistable, or multifunction
Control voltage and whether AC, DC, or both are needed
Output load type and approximate current
Control signal method and sequence logic
DIN rail space and cabinet environment
Quantity and repeat order expectation

Why This Matters for Faster RFQ

Reduces back-and-forth over function mismatch
Helps separate timer relay products from other relay categories
Improves model confirmation for export panel projects
Makes time relay quotation more accurate from the first reply
Supports product substitution when a like-for-like function match is needed

⎯⎯ Resources

Useful Paths Around the Timer Relay Range

The timer relay range can be reviewed by function family, related relay type, or application requirement, depending on how the control circuit is structured.

Extended Timer Relay Range

Selected where lightning current exposure is relevant and the SPD is positioned at the upstream side of the protection concept.

Related Relay Categories

Projects that need more than one relay type often review timer relay products together with these related control relay categories.

Control Panel Use Notes

Timer relays are most often selected for circuits that need compact DIN rail installation, stable timing behavior, and straightforward coordination with contactors, PLC outputs, and auxiliary relay logic.

⎯⎯ FAQ

Frequently Asked Questions About Timer Relay

What is the difference between a timer relay and a time relay?

In practice, timer relay and time relay are often used to mean the same product category. Both describe a relay that changes contact state after a preset timing function such as delay-on, delay-off, interval, or pulse timing.

What timer relay functions are most common in the VIOX range?

The most common functions include single-function time relay, on-delay, off-delay, interval, pulse-delayed, asymmetrical flashing, bistable, and asymmetrical on-delay and off-delay timing. The FCT18 range is organized around these practical control logic types.

What voltage range is available for VIOX timer relay products?

VIOX timer relay products support wide AC/DC control voltage coverage from 12V to 240V, which helps the same product family fit different control panel standards and retrofit requirements.

How do I choose the right timer relay model?

Start with the actual timing function, then confirm supply voltage, output contact rating, control signal method, timing range, and application environment. This narrows the model faster than starting from dimensions or general category names.

What details should I send for a timer relay quotation?

Send the preferred timer relay function, control voltage, contact rating, installation format, application, and quantity. If you already know a target model such as FCT18-Q, FCT18-Bta, or FCT18-WgR, include it in the RFQ to speed up confirmation.

⎯⎯ Request Quote

Discuss the Right Timer Relay Configuration

Share the timing function, supply voltage, contact rating, application, and quantity. VIOX can help match the right timer relay or time relay model across the FCT18 range for panel building, automation, signaling, and motor auxiliary timing projects.

Required timer relay function
Supply voltage and control method
Output contact load and current
Preferred model or equivalent reference
Installation environment and panel format
Trial quantity and repeat order expectation