Timer Relays

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Timer Relays are a type of Control Relay with a time delay built in.


Timer Relay or Electromechanical Relay?


The difference between the timer relay and electromechanical relay is that when the output contacts open or close. On a conventional Control Relay, the contacts are opened or closed when a voltage is applied and removed from the coil - for timer relays, however, the contacts will open or close before or after an intentional time period. When choosing the right Timer Relay it is important to consider the right kind of delay required for your application.


What are the types of Timer Relays that I can choose from?


The most common timing function of Time Delay Relay are:


  • On Delay (Time delay starts on the application of voltage)

  • Off Delay (When a voltage is applied the relay is ready to accept a trigger)

  • Single Shot (One-shot)

  • Interval On (Interval) and Flasher (On First / Off First)

  • Repeat Cycle (When a voltage is applied the relay contacts change state and the timer starts)

When designing your application it is important to understand the difference between the particular types of the timer relays. That means to consider what should initiate the delay and whether the timing should start at the same time as the application as well as when the voltage is released.


Timer Relays are triggered/initiated by either:


  • Voltage being applied or

  • The closing or opening of a trigger signal

Trigger signals are either:


  • Control Switch ( Dry Contact) such as a limit switch, float switch or push button or

  • Voltage ( Power Trigger)

Where can I use Timer Relay?


Time Delay Relays are typically used in industrial applications and OEM equipment play an important role for many industrial processes such as small panel or sub-panels requirements.


  • Lighting circuits

  • Motor start control

  • Sensitive equipment

  • Safety control

  • Conveyor belt sequence delay
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Description Price Supply Voltage Time Range Mode of Operation Mounting Type Number of Timer Functions Number of Contacts Series Time Increment Power Supply Contact Configuration Current Maximum Terminal Type Minimum Voltage Maximum Voltage
RS Stock No. 684-3689
Mfr. Part No.2917463
TWD1,467.00
Each
units
19.2 30 V dc 3 300 s OFF Delay with Control Contact DIN Rail Single 1 ETD-BL-1T-OFF-CC-300S Seconds External - 6.3 A Screw - -
RS Stock No. 877-8105
Mfr. Part No.2901484
TWD1,542.00
Each
units
- 3 → 300 min Switch ON Delay DIN Rail Single 2 ETD-BL-1T-ON-CC-300MIN-PT Minutes External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 877-8091
Mfr. Part No.2901481
TWD1,560.00
Each
units
- 3 → 300 s Switch ON Delay DIN Rail Single 2 ETD-BL-1T-ON-CC-300S-PT Seconds External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 877-8095
Mfr. Part No.2901483
TWD1,619.00
Each
units
- 0.3 → 30 min Switch ON Delay DIN Rail Single 2 ETD-BL-1T-ON-CC- 30MIN-PT Minutes External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 684-3686
Mfr. Part No.2917489
TWD1,399.00
Each
units
19.2 30 V dc 3 300 min OFF Delay with Control Contact DIN Rail Single 1 ETD-BL-1T-OFF-CC-300MIN Minutes External - 6.3 A Screw - -
RS Stock No. 684-3670
Mfr. Part No.2917450
TWD1,467.00
Each
units
19.2 30 V dc 0.1 10 s OFF Delay with Control Contact DIN Rail Single 1 - Minutes External - 6.3 A Screw - -
RS Stock No. 684-3673
Mfr. Part No.2917434
TWD1,399.00
Each
units
19.2 30 V dc 0.3 30 min ON Delay with Control Contact DIN Rail Single 1 ETD-BL-1T-ON-CC- 30MIN Minutes External - 6.3 A Screw - -
RS Stock No. 877-8098
Mfr. Part No.2901480
TWD1,559.00
Each
units
- 0.1 → 10 s Switch ON Delay DIN Rail Single 2 ETD-BL-1T-ON-CC- 10S-PT Seconds External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 189-2322
Mfr. Part No.2910140
TWD2,345.00
Each
units
19.2 30 V dc 0.1 s 300 min Flashing Beginning with Pulse, Release Delay and Control Contact, Switch-On Delay, Switch-On Delay and Control Contact DIN Rail - 1 PLC-TR-1T-MUL-300M Minutes, Seconds - SPDT 6 A Screw 19.2 V dc 30 V dc
RS Stock No. 684-3651
Mfr. Part No.2917379
TWD1,467.00
Each
units
19.2 30 V dc 0.1 10 s ON Delay DIN Rail Single 1 ETD-BL-1T-ON- 10S Seconds External - 6.3 A Spring Clamp - -
RS Stock No. 684-3660
Mfr. Part No.2917418
TWD1,399.00
Each
units
19.2 30 V dc 0.1 10 s ON Delay with Control Contact DIN Rail Single 1 ETD-BL-1T-ON-CC- 10S Seconds External - 6.3 A Spring Clamp - -
RS Stock No. 877-8089
Mfr. Part No.2901479
TWD1,638.00
Each
units
- 3 → 300 min Switch ON Delay DIN Rail Single 2 ETD-BL-1T-ON-300MIN-PT Minutes External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 684-3654
Mfr. Part No.2917382
TWD1,399.00
Each
units
19.2 30 V dc 3 300 s ON Delay DIN Rail Single 1 ETD-BL-1T-ON-300S Seconds External - 6.3 A Screw - -
RS Stock No. 877-8133
Mfr. Part No.2905813
TWD2,012.00
Each
units
- 50 ms → 1 h One Shot with Control Contact, Release Delay with Control Contact, Switch ON Delay, Switch ON Delay with Control Contact DIN Rail Multi Function 2 - Hours, Milliseconds External SPDT - Screw 24 V ac/dc 240 V ac/dc
RS Stock No. 877-8127
Mfr. Part No.2901490
TWD1,619.00
Each
units
- 3 → 300 s Flasher DIN Rail Single 2 ETD-BL Seconds External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 877-8114
Mfr. Part No.2901488
TWD1,619.00
Each
units
- 3 → 300 min Switch OFF Delay DIN Rail Single 2 ETD-BL-1T-OFF-CC-300MIN-PT Minutes External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 877-8102
Mfr. Part No.2901486
TWD1,559.00
Each
units
- 3 → 300 s Switch OFF Delay DIN Rail Single 2 ETD-BL-1T-OFF-CC-300S-PT Seconds External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 877-8073
Mfr. Part No.2901476
TWD1,159.00
Each
units
- 0.1 → 10 s Switch ON Delay DIN Rail Single 2 ETD-BL-1T-ON- 10S-PT Seconds External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 684-3682
Mfr. Part No.2917467
TWD1,449.00
Each
units
19.2 30 V dc 0.3 30 min OFF Delay with Control Contact DIN Rail Single 1 ETD-BL-1T-OFF-CC- 30MIN Minutes External - 6.3 A Screw - -
RS Stock No. 189-2323
Mfr. Part No.2910141
TWD2,345.00
Each
units
19.2 30 V dc 0.1 s 300 min Flashing Beginning with Pulse, Release Delay and Control Contact, Switch-On Delay, Switch-On Delay and Control Contact DIN Rail - 1 PLC-TR-1T-MUL-300M-PT Minutes, Seconds - SPDT 6 A Push-In 19.2 V dc 30 V dc