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. 179-2970
BrandRS PRO
SGD60.68
Each
units
110 V ac 1 → 30 s On-Delay Plug In Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2934
BrandRS PRO
SGD45.87
Each
units
230 V ac 0.2 → 5 min On-Delay Plug In Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 179-2976
BrandRS PRO
SGD53.78
Each
units
110 V ac 1 → 30 min On-Delay Plug In Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2932
BrandRS PRO
SGD45.87
Each
units
230 V ac 2 → 60 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 179-2921
BrandRS PRO
SGD78.31
Each
units
110 V ac 0.1 s → 300 h B: ON-Delay, C: Signal ON/OFF Delay, D: Signal OFF Delay, E: Interval, F: Flicker ON Start, R: Flicker OFF Start Panel Mount, Plug-In Mount Multi Function 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2908
BrandRS PRO
SGD162.60
Each
units
100 → 240 V ac 999.9 s Power On-Delay Plug In - 8 - - - SPDT 5 A - 100 V ac 240 V ac
RS Stock No. 179-2939
BrandRS PRO
SGD43.42
Each
units
110 V ac 0.5 → 10 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2938
BrandRS PRO
SGD48.25
Each
units
110 V ac 0.2 → 5 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2951
BrandRS PRO
SGD48.25
Each
units
24 V dc 2 → 60 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2948
BrandRS PRO
SGD48.25
Each
units
24 V dc 0.2 → 5 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2926
BrandRS PRO
SGD69.62
Each
units
24 V dc 0.1 s → 300 h On-Delay Panel Mount, Plug-In Mount Single 2 - - - 2 x SPDT 5 A - - 24 V dc
RS Stock No. 179-2984
BrandRS PRO
SGD51.42
Each
units
24 V dc 0.2 → 5 min On-Delay Plug In Single 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 896-6832
BrandRS PRO
SGD54.23
Each
units
240 → 415 V ac 3 → 120 s Star Delta DIN Rail Single 2 - Seconds External CO (Delta), CO (Star) 5 A Screw 240 V ac 415 V ac
RS Stock No. 179-2913
BrandRS PRO
SGD209.67
Each
units
12 → 48 V dc 99 min 59 s Power On Delay Plug In Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2949
BrandRS PRO
SGD48.25
Each
units
24 V dc 0.5 → 10 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2916
BrandRS PRO
SGD104.42
Each
units
12 → 48 V dc, 24 → 48 V ac 0.1 s → 300 h B: ON-Delay, C: Signal ON/OFF Delay, D: Signal OFF Delay, E: Interval, F: Flicker ON Start, R: Flicker OFF Start Panel Mount, Plug-In Mount Multi Function 2 - - - DPDT 5 A - 12 V dc, 24 V ac 48 V ac/dc
RS Stock No. 179-2937
BrandRS PRO
SGD54.42
Each
units
110 V ac 0.1 → 1 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2973
BrandRS PRO
SGD60.68
Each
units
110 V ac 0.2 → 5 min On-Delay Plug In Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 178-5024
BrandRS PRO
SGD85.88
Each
units
12 → 240 V ac/dc 0.1 s → 10 min Star Delta Delay Plug In 1 - - Minutes, Seconds External 2 x SPDT 8 A 11-Pin Connector 12 V ac/dc -
RS Stock No. 896-6854
BrandRS PRO
SGD40.03
Each
units
24 → 240 V ac/dc 01. s → 999 h Multi Function DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 8 A - 24 V ac/dc 240 V ac/dc