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. 179-2906
BrandRS PRO
PHP7,743.00
Each
units
12 → 48 V dc 99 h 59 min Power On Delay Plug-In Mount 1 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2975
BrandRS PRO
PHP1,987.00
Each
units
110 V ac 0.5 → 10 min On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2972
BrandRS PRO
PHP1,987.00
Each
units
110 V ac 0.1 → 3 min On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2913
BrandRS PRO
PHP7,743.00
Each
units
12 → 48 V dc 99 min 59 s Power On Delay Plug-In Mount 1 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2954
BrandRS PRO
PHP1,899.00
Each
units
24 V dc 0.2 → 5 min On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 178-5029
BrandRS PRO
PHP2,952.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-1078
BrandRS PRO
PHP3,658.25
Each
units
24 V ac/dc - Multi function Panel Mount - - - Seconds - - - Screw - -
RS Stock No. 179-2950
BrandRS PRO
PHP1,782.00
Each
units
24 V dc 1 → 30 s On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2983
BrandRS PRO
PHP1,899.00
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. 179-2971
BrandRS PRO
PHP1,987.00
Each
units
110 V ac 2 → 60 s On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2957
BrandRS PRO
PHP1,899.00
Each
units
230 V ac 0.1 → 1 s On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 230 V ac
RS Stock No. 179-2932
BrandRS PRO
PHP1,695.00
Each
units
230 V ac 2 → 60 s On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 230 V ac
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 1 1 - - External SPDT 5 A - 100 V ac 240 V ac
RS Stock No. 179-2985
BrandRS PRO
PHP1,899.00
Each
units
24 V dc 0.5 → 10 min On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 179-2938
BrandRS PRO
PHP1,782.00
Each
units
110 V ac 0.2 → 5 s On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2935
BrandRS PRO
PHP1,695.00
Each
units
230 V ac 0.5 → 10 min On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 179-2959
BrandRS PRO
PHP1,899.00
Each
units
230 V ac 0.5 → 10 s On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 230 V ac
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. 179-2907
BrandRS PRO
PHP7,743.00
Each
units
100 → 240 V ac 99.9 s Power On-Delay Plug In - 8 - - - SPDT 5 A - 100 V ac 240 V ac
RS Stock No. 179-2910
BrandRS PRO
PHP7,743.00
Each
units
100 → 240 V ac 99.59 h Power On-Delay Plug In - 8 - - - SPDT 5 A - 100 V ac 240 V ac
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