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. 798-3444
BrandRS PRO
TWD1,411.00
Each
units
230 V ac - Interval Clamp Single 1 - Hours, Minutes, Seconds External NC, SPNO - - - 230 V ac
RS Stock No. 102-6127
BrandRS PRO
TWD1,422.00
Each
units
12 230 V ac/dc - - DIN Rail - - - - - SPDT - Screw - -
RS Stock No. 102-6128
BrandRS PRO
TWD1,165.00
Each
units
12 → 230 V ac/dc - - DIN Rail Multi Function - - - - SPDT - Screw - -
RS Stock No. 179-2970
BrandRS PRO
TWD1,181.00
Each
units
110 V ac 1 30 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 102-6129
BrandRS PRO
TWD1,109.00
Each
units
12 230 V ac/dc - - DIN Rail Multi Function - - - - SPDT - Screw - -
RS Stock No. 179-2933
BrandRS PRO
TWD1,007.00
Each
units
230 V ac 0.1 3 min On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 178-5026
BrandRS PRO
TWD2,114.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-2926
BrandRS PRO
TWD1,529.00
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. 179-2971
BrandRS PRO
TWD1,181.00
Each
units
110 V ac 2 60 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2912
BrandRS PRO
TWD3,570.00
Each
units
12 48 V dc 999.9 s Power On Delay Plug-In Mount Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2929
BrandRS PRO
TWD1,007.00
Each
units
230 V ac 0.5 10 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 178-5024
BrandRS PRO
TWD2,043.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 808-6623
BrandRS PRO
TWD2,510.00
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. 896-6866
BrandRS PRO
TWD819.00
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. 179-2913
BrandRS PRO
TWD4,604.00
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. 179-2982
BrandRS PRO
TWD1,129.00
Each
units
24 V dc 2 60 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 179-2965
BrandRS PRO
TWD1,181.00
Each
units
230 V ac 1 30 min On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 230 V ac
RS Stock No. 179-2957
BrandRS PRO
TWD1,129.00
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. 178-5025
BrandRS PRO
TWD2,114.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 896-6872
BrandRS PRO
TWD2,208.00
Each
units
110 → 240 V ac 01.s → 999 days Multi Function Panel Mount Multi Function 2 - Days, Hours, Minutes, Seconds External - 5 A PCB Pin 110 V ac 240 V ac