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. 179-2931
BrandRS PRO
MYR137.41
Each
units
230 V ac 1 → 30 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 896-6872
BrandRS PRO
MYR307.14
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
RS Stock No. 179-2944
BrandRS PRO
MYR160.62
Each
units
110 V ac 0.5 → 10 min On-Delay Plug In Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2904
BrandRS PRO
MYR689.69
Each
units
12 → 48 V dc 999.9 s Power On Delay Plug In Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2922
BrandRS PRO
MYR260.68
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 Multi Function 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 124-1078
BrandRS PRO
MYR489.86
Each
units
24 V ac/dc - Multi function Panel Mount Multi Function - - Seconds - - - Screw - -
RS Stock No. 179-2971
BrandRS PRO
MYR179.03
Each
units
110 V ac 2 → 60 s On-Delay Plug In Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2901
BrandRS PRO
MYR487.11
Each
units
100 → 240 V ac 99 h 59 min Power On Delay Plug In Single 1 - - External SPDT 5 A - 100 V ac 240 V ac
RS Stock No. 179-2909
BrandRS PRO
MYR541.23
Each
units
100 → 240 V ac 99.9 ms Power On-Delay Plug In - 8 - - - SPDT 5 A - 100 V ac 240 V ac
RS Stock No. 896-6844
BrandRS PRO
MYR254.69
Each
units
24 → 240 V ac/dc 0.6 → 600 s True Off Delay DIN Rail Single 2 - Seconds External DPDT 5 A Screw 24 V ac/dc 240 V ac/dc
RS Stock No. 179-2925
BrandRS PRO
MYR231.73
Each
units
110 V ac 0.1 s → 300 h On-Delay Panel Mount, Plug-In Single 2 - - - 2 x SPDT 5 A - - 110 V ac
RS Stock No. 179-2920
BrandRS PRO
MYR234.61
Each
units
220 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 Multi Function 2 - - - DPDT 5 A - - 220 V ac
RS Stock No. 179-2963
BrandRS PRO
MYR179.03
Each
units
230 V ac 0.2 → 5 min On-Delay Plug In Single 4 - - - 4PDT 3 A - - 230 V ac
RS Stock No. 179-2934
BrandRS PRO
MYR170.70
Each
units
230 V ac 0.2 → 5 min On-Delay Plug In Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 179-2973
BrandRS PRO
MYR180.91
Each
units
110 V ac 0.2 → 5 min On-Delay Plug In Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 896-6838
BrandRS PRO
MYR142.52
Each
units
240 V ac 3 → 120 s Star Delta DIN Rail Single 2 - Seconds External SPNO 5 A Screw - 24 V ac/dc, 240 V ac
RS Stock No. 179-2964
BrandRS PRO
MYR180.91
Each
units
230 V ac 0.5 → 10 min On-Delay Plug In Single 4 - - - 4PDT 3 A - - 230 V ac
RS Stock No. 179-2900
BrandRS PRO
MYR541.23
Each
units
100 → 240 V ac 99 min 59 s Power On Delay Plug In Single 1 - - External SPDT 5 A - 100 V ac 240 V ac
RS Stock No. 179-2927
BrandRS PRO
MYR137.41
Each
units
230 V ac 0.1 → 1 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 179-2960
BrandRS PRO
MYR154.04
Each
units
230 V ac 1 → 30 s On-Delay Plug In Single 4 - - - 4PDT 3 A - - 230 V ac