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. 102-6128
BrandRS PRO
R 471.47
Each
units
12 → 230 V ac/dc - - DIN Rail - - - - - SPDT - Screw - -
RS stock no. 808-6623
BrandRS PRO
R 1,100.38
Each
units
24 V ac/dc - One Shot Panel Mount Single 1 - Hours, Minutes, Seconds External SPDT 50 mA - - 24 V ac/dc
RS stock no. 896-6810
BrandRS PRO
R 356.44
Each
units
24 V ac/dc, 240 V ac 0.3 s → 30 h ON Delay DIN Rail Single 1 - Seconds External SPDT 5 A Screw - 24 V ac/dc, 240 V ac
RS stock no. 896-6813
BrandRS PRO
R 476.62
Each
units
12 → 240 V ac/dc 0.1 s → 100 h Multi Function DIN Rail 10 1 - Hours, Minutes, Seconds External SPDT 6 A Screw 12 V ac/dc 240 V ac/dc
RS stock no. 536-2555
BrandRS PRO
R 413.91
Each
units
250 V ac 0 → 30 min - Panel Mount - - - - External - - - - -
RS stock no. 808-6620
BrandRS PRO
R 1,007.53
Each
units
230 V ac - One Shot Panel Mount Single 1 - Minutes, Seconds External SPDT 50 mA - - 230 V ac
RS stock no. 896-6838
BrandRS PRO
R 460.35
Each
units
240 V ac 3 → 120 s Star Delta DIN Rail Single 2 - Seconds External SPNO 5 A Screw - 24 V ac/dc, 240 V ac
RS stock no. 896-6816
BrandRS PRO
R 358.15
Each
units
24 V ac/dc, 110 V ac 0.3 s → 30 h ON Delay DIN Rail Single 1 - Seconds External SPDT 5 A Screw - 24 V ac/dc, 110 V ac
RS stock no. 896-6829
BrandRS PRO
R 388.23
Each
units
24 V ac/dc, 110 V ac 0.3 s → 30 h OFF Delay DIN Rail Single 1 - Seconds External SPDT 5 A Screw - 24 V ac/dc, 110 V ac
RS stock no. 896-6822
BrandRS PRO
R 388.36
Each
units
24 V ac/dc, 240 V ac 0.3 s → 30 h OFF Delay DIN Rail Single 1 - Seconds External SPDT 5 A Screw - 24 V ac/dc, 240 V ac
RS stock no. 102-6122
BrandRS PRO
R 483.12
Each
units
12 → 230 V ac/dc - - DIN Rail Multi Function - - - - SPDT - Screw - -
RS stock no. 896-6826
BrandRS PRO
R 592.15
Each
units
12 → 240 V ac/dc 0.1 s → 100 h Asymmetric OFF/ON, Asymmetric ON/OFF DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 8 A Screw 12 V ac/dc 240 V ac/dc
RS stock no. 102-6124
BrandRS PRO
R 435.87
Each
units
12 → 230 V ac/dc - - DIN Rail - - - - - SPDT - Screw - -
RS stock no. 179-2981
BrandRS PRO
R 511.27
Each
units
24 V dc 1 → 30 s On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS stock no. 179-2982
BrandRS PRO
R 511.27
Each
units
24 V dc 2 → 60 s On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS stock no. 179-2983
BrandRS PRO
R 511.33
Each
units
24 V dc 0.1 → 3 min On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS stock no. 178-5024
BrandRS PRO
R 806.57
Each
units
- - - - - - - - - - - - - -
RS stock no. 179-2919
BrandRS PRO
R 1,572.18
Each
units
100 → 125 V dc, 100 → 240 V ac 0.1 s → 300 h On-Delay Panel Mount, Plug-In Mount 1 1 - - - SPDT, SPDT (Instantaneous) 5 A - 100 V ac/dc 125 V dc, 240 V ac
RS stock no. 179-2984
BrandRS PRO
R 511.20
Each
units
24 V dc 0.2 → 5 min On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS stock no. 536-2779
BrandRS PRO
R 444.30
Each
units
250 V ac 0 → 120 min - Panel Mount - - - - External - - - - -