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. 896-6848
BrandRS PRO
PHP2,450.97
Each
units
24 → 240 V ac/dc 0.1 s → 10 h ON Delay DIN Rail Multi Function 2 - Seconds External DPDT 5 A Screw 24 V ac/dc 240 V ac/dc
RS Stock No. 179-2922
BrandRS PRO
PHP3,041.16
Each
units
24 V dc 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 - - 24 V dc
RS Stock No. 179-2913
BrandRS PRO
PHP8,142.18
Each
units
12 48 V dc 99 min 59 s Power On Delay Plug-In Mount Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2957
BrandRS PRO
PHP1,996.83
Each
units
230 V ac 0.1 1 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 230 V ac
RS Stock No. 179-2903
BrandRS PRO
PHP8,142.18
Each
units
12 48 V dc 99.99 s Power On Delay Plug-In Mount Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2977
BrandRS PRO
PHP1,996.83
Each
units
24 V dc 0.1 1 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 896-6866
BrandRS PRO
PHP2,671.42
Each
units
24 240 V ac/dc 01. s 999 h Multi Function DIN Rail Multi Function 2 - Hours, Minutes, Seconds External DPNO 8 A - 24 V ac/dc 240 V ac/dc
RS Stock No. 179-2955
BrandRS PRO
PHP1,996.83
Each
units
24 V dc 0.5 10 min On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2900
BrandRS PRO
PHP7,743.00
Each
units
100 240 V ac 99 min 59 s Power On Delay Plug-In Mount Single 1 - - External SPDT 5 A - 100 V ac 240 V ac
RS Stock No. 179-2926
BrandRS PRO
PHP2,703.43
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. 179-2917
BrandRS PRO
PHP3,716.63
Each
units
100 125 V dc, 100 240 V ac 0.1 s 300 h A: ON-Delay, B2: Flicker ON Start, E: Interval, J: One-Shot Panel Mount, Plug-In Mount - 2 - - - DPDT 5 A - 100 V ac/dc 125 V dc, 240 V ac
RS Stock No. 179-2978
BrandRS PRO
PHP1,996.83
Each
units
24 V dc 0.2 5 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 161-7606
BrandRS PRO
PHP3,336.07
Each
units
10.5 265 V ac/dc 0.6 s 60 min Asymmetrical Recycler with Pause Start, Asymmetrical Recycler with Pulse Start, Delay Pulse, OFF Pulse, ON Delay, ON Pulse, ON Pulse with Control Switch, One Shot Asymmetrical with Control Switch, One Shot Asymmetrical without Control Switch, Release Delay, Release True OFF Delay, Symmetrical Recycler with Pause Start, Symmetrical Recycler with Pulse Start DIN Rail Multi Function 1 - Minutes, Seconds External - 8 A Screw 10.5 V ac/dc 265 V ac/dc
RS Stock No. 179-2918
BrandRS PRO
PHP3,716.63
Each
units
12 48 V dc, 24 48 V ac 0.1 s 300 h A: ON-Delay, B2: Flicker ON Start, E: Interval, J: One-Shot Panel Mount, Plug-In Mount - 2 - - - DPDT 5 A - 12 V dc, 24 V ac 48 V ac/dc
RS Stock No. 179-2928
BrandRS PRO
PHP1,781.27
Each
units
230 V ac 0.2 5 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 896-6832
BrandRS PRO
PHP2,105.78
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. 179-2950
BrandRS PRO
PHP1,873.88
Each
units
24 V dc 1 30 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2937
BrandRS PRO
PHP1,873.88
Each
units
110 V ac 0.1 1 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2939
BrandRS PRO
PHP1,873.88
Each
units
110 V ac 0.5 10 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2979
BrandRS PRO
PHP1,996.83
Each
units
24 V dc 0.5 10 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 24 V dc
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