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. 179-2948
BrandRS PRO
$62.27
Each
units
24 V dc 0.2 → 5 s On-Delay Plug In Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 896-6863
BrandRS PRO
$102.06
Each
units
24 → 240 V ac/dc 01. s → 999 h Multi Function DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 8 A - 24 V ac/dc 240 V ac/dc
RS Stock No. 179-2921
BrandRS PRO
$98.69
Each
units
110 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 Mount Multi Function 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 179-2944
BrandRS PRO
$60.80
Each
units
110 V ac 0.5 → 10 min On-Delay Plug In Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 161-7611
BrandRS PRO
$89.51
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 Plug In Multi Function 1 - Minutes, Seconds External - 8 A 11-Pin Connector 10.5 V ac/dc 265 V ac/dc
RS Stock No. 178-5021
BrandRS PRO
$100.72
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-2901
BrandRS PRO
$264.17
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. 179-2911
BrandRS PRO
$264.17
Each
units
12 → 48 V dc 99.99 s Power On Delay Plug In Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2982
BrandRS PRO
$64.79
Each
units
24 V dc 2 → 60 s On-Delay Plug In Single 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 896-6835
BrandRS PRO
$62.10
Each
units
115 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. 179-2917
BrandRS PRO
$123.53
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. 179-2967
BrandRS PRO
$67.78
Each
units
110 V ac 0.2 → 5 s On-Delay Plug In Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 102-6124
BrandRS PRO
$65.07
Each
units
12 → 230 V ac/dc - ON Delay DIN Rail Multi Function - - - - SPDT - Screw - -
RS Stock No. 179-2985
BrandRS PRO
$64.79
Each
units
24 V dc 0.5 → 10 min On-Delay Plug In Single 4 - - - 4PDT 3 A - - 24 V dc
RS Stock No. 179-2973
BrandRS PRO
$67.78
Each
units
110 V ac 0.2 → 5 min On-Delay Plug In Single 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 Single 2 - - - 2 x SPDT 5 A - - 110 V ac
RS Stock No. 179-2919
BrandRS PRO
$198.37
Each
units
100 → 125 V dc, 100 → 240 V ac 0.1 s → 300 h On-Delay Panel Mount, Plug-In Mount Single 1 - - - SPDT, SPDT (Instantaneous) 5 A - 100 V ac/dc 125 V dc, 240 V ac
RS Stock No. 179-2959
BrandRS PRO
$64.79
Each
units
230 V ac 0.5 → 10 s On-Delay Plug In Single 4 - - - 4PDT 3 A - - 230 V ac
RS Stock No. 179-2903
BrandRS PRO
$264.17
Each
units
12 → 48 V dc 99.99 s Power On Delay Plug In Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 178-5028
BrandRS PRO
$127.95
Each
units
24 V ac/dc, 110 V ac, 230 V ac 0.1 s → 30 min Off Delay Plug In 1 - - Minutes, Seconds External DPDT 8 A 11-Pin Connector 24 V ac/dc -
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