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. 179-2975
BrandRS PRO
$67.78
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. 179-2925
BrandRS PRO
$87.74
Each
units
110 V ac 0.1 s → 300 h On-Delay Panel Mount, Plug-In Mount 1 2 - - - 2 x SPDT 5 A - - 110 V ac
RS Stock No. 179-2904
BrandRS PRO
$264.16
Each
units
12 → 48 V dc 999.9 s Power On Delay Plug-In Mount 1 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 178-5022
BrandRS PRO
$111.44
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-2979
BrandRS PRO
$64.79
Each
units
24 V dc 0.5 → 10 s On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 179-2907
BrandRS PRO
$264.16
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. 179-2976
BrandRS PRO
$67.78
Each
units
110 V ac 1 → 30 min On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2905
BrandRS PRO
$264.16
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. 179-2986
BrandRS PRO
$64.79
Each
units
24 V dc 1 → 30 min On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 178-5023
BrandRS PRO
$111.44
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-2926
BrandRS PRO
$87.74
Each
units
24 V dc 0.1 s → 300 h On-Delay Panel Mount, Plug-In Mount 1 2 - - - 2 x SPDT 5 A - - 24 V dc
RS Stock No. 161-7605
BrandRS PRO
$100.36
Each
units
10.5 → 265 V ac/dc 0.6 s → 60 min Off Pulse, ON Pulse with Control Switch, ON Pulse without Control Switch, On-Off Pulse DIN Rail Multi Function 1 - Minutes, Seconds External - 8 A Screw 10.5 V ac/dc 265 V ac/dc
RS Stock No. 179-2908
BrandRS PRO
$264.16
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. 179-2977
BrandRS PRO
$64.79
Each
units
24 V dc 0.1 → 1 s On-Delay Plug-In Mount 1 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 179-2927
BrandRS PRO
$57.82
Each
units
230 V ac 0.1 → 1 s On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 179-2936
BrandRS PRO
$60.79
Each
units
230 V ac 1 → 30 min On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 179-2912
BrandRS PRO
$264.16
Each
units
12 → 48 V dc 999.9 s Power On Delay Plug-In Mount 1 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2972
BrandRS PRO
$67.78
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. 179-2940
BrandRS PRO
$60.79
Each
units
110 V ac 1 → 30 s On-Delay Plug-In Mount 1 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 161-7612
BrandRS PRO
$96.95
Each
units
10.5 → 265 V ac/dc 0.6 s → 60 min Off Pulse, ON Pulse with Control Switch, ON Pulse without Control Switch, On-Off Pulse Plug In Multi Function 1 - Minutes, Seconds External - 8 A 11-Pin Connector 10.5 V ac/dc 265 V ac/dc
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