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庫存編號 808-6623
BrandRS PRO
HK$668.78
單位
24 V ac/dc - One Shot Panel Mount Single 1 - Hours, Minutes, Seconds External SPDT 50 mA - - 24 V ac/dc
RS庫存編號 536-2779
BrandRS PRO
HK$264.04
單位
250 V ac 0 → 120 min - Panel Mount - - - - External - - - - -
RS庫存編號 808-6620
BrandRS PRO
HK$611.93
單位
230 V ac - One Shot Panel Mount Single 1 - Minutes, Seconds External SPDT 50 mA - - 230 V ac
RS庫存編號 102-6122
BrandRS PRO
HK$318.72
單位
12 → 230 V ac/dc - - DIN Rail Multi Function - - - - SPDT - Screw - -
RS庫存編號 536-2555
BrandRS PRO
HK$245.39
單位
250 V ac 0 30 min - Panel Mount - - - - External - - - - -
RS庫存編號 896-6826
BrandRS PRO
HK$305.49
單位
12 240 V ac/dc 0.1 s 100 h Asymmetric OFF/ON, Asymmetric ON/OFF DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 8 A Screw 12 V ac/dc 240 V ac/dc
RS庫存編號 896-6822
BrandRS PRO
HK$211.74
單位
24 V ac/dc, 240 V ac 0.3 s → 30 h OFF Delay DIN Rail Single 1 - Seconds External SPDT 5 A Screw - 24 V ac/dc, 240 V ac
RS庫存編號 179-2984
BrandRS PRO
HK$309.72
單位
24 V dc 0.2 5 min On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 24 V dc
RS庫存編號 161-7607
BrandRS PRO
HK$512.37
單位
10.5 265 V ac/dc 0.6 s 60 min Asymmetrical Recycler with Pause Start, Asymmetrical Recycler with Pulse Start DIN Rail Multi Function 1 - Minutes, Seconds External - 8 A Screw 10.5 V ac/dc 265 V ac/dc
RS庫存編號 179-2985
BrandRS PRO
HK$309.72
單位
24 V dc 0.5 10 min On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 24 V dc
RS庫存編號 178-3459
BrandRS PRO
HK$349.61
單位
12 240 V ac/dc 0.1 s 100 h Accumulative Delay on Signal, Cyclic OFF/ON, Cyclic ON/OFF, Impulse ON/OFF, Interval, Leading Edge Bi-stable, Leading Edge Impulse, On Delay, Signal OFF Delay, Signal OFF/ON, Signal ON Delay, Trailing Edge Impulse DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 16 A Screw 12 V ac/dc 240 V ac/dc
RS庫存編號 179-2928
BrandRS PRO
HK$276.40
單位
230 V ac 0.2 5 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 230 V ac
RS庫存編號 179-2936
BrandRS PRO
HK$290.65
單位
230 V ac 1 30 min On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 230 V ac
RS庫存編號 179-2904
BrandRS PRO
HK$1,262.88
單位
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庫存編號 179-2971
BrandRS PRO
HK$324.08
單位
110 V ac 2 60 s On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 110 V ac
RS庫存編號 179-2906
BrandRS PRO
HK$1,262.88
單位
12 48 V dc 99 h 59 min Power On Delay Plug-In Mount Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS庫存編號 179-2929
BrandRS PRO
HK$276.40
單位
230 V ac 0.5 10 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 230 V ac
RS庫存編號 896-6835
BrandRS PRO
HK$278.11
單位
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庫存編號 179-2951
BrandRS PRO
HK$290.65
單位
24 V dc 2 60 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 24 V dc
RS庫存編號 179-2986
BrandRS PRO
HK$309.72
單位
24 V dc 1 30 min On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 24 V dc