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. 179-2917
BrandRS PRO
$121.70
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. 179-2953
BrandRS PRO
$61.35
Each
units
24 V dc 0.1 3 min On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2947
BrandRS PRO
$61.35
Each
units
24 V dc 0.1 1 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 24 V dc
RS Stock No. 179-2919
BrandRS PRO
$200.18
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. 896-6863
BrandRS PRO
$100.55
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. 179-2927
BrandRS PRO
$58.34
Each
units
230 V ac 0.1 1 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 230 V ac
RS Stock No. 896-6832
BrandRS PRO
$70.24
Each
units
240 415 V ac 3 120 s Star Delta DIN Rail Single 2 - Seconds External CO (Delta), CO (Star) 5 A Screw 240 V ac 415 V ac
RS Stock No. 179-2940
BrandRS PRO
$61.35
Each
units
110 V ac 1 30 s On-Delay Plug-In Mount Single 2 - - - DPDT 5 A - - 110 V ac
RS Stock No. 178-5021
BrandRS PRO
$101.63
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-2904
BrandRS PRO
$266.57
Each
units
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 Stock No. 179-2975
BrandRS PRO
$68.40
Each
units
110 V ac 0.5 10 min On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 179-2903
BrandRS PRO
$266.57
Each
units
12 48 V dc 99.99 s Power On Delay Plug-In Mount Single 1 - - External SPDT 5 A - 12 V dc 48 V dc
RS Stock No. 179-2973
BrandRS PRO
$68.40
Each
units
110 V ac 0.2 5 min On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 896-6826
BrandRS PRO
$74.78
Each
units
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 Stock No. 179-2972
BrandRS PRO
$68.40
Each
units
110 V ac 0.1 3 min On-Delay Plug-In Mount Single 4 - - - 4PDT 3 A - - 110 V ac
RS Stock No. 160-262
Mfr. Part No.E1ZMQ10 24-240V AC/DC
BrandTele
$77.20
Each
units
24 → 240 V ac/dc 50 ms → 100 h Flash Pause First, OFF Delay, ON Delay, One Shot Leading Edge Voltage Controlled DIN Rail Multi Function 1 E1ZMQ10 Hours, Milliseconds, Minutes, Seconds External SPDT 8 A - - 250 V ac
RS Stock No. 828-5158
Mfr. Part No.LMMT 12-230V AC/DC
$75.00
Each
units
12 → 230 V ac/dc 0.1 s → 100 h Delay Off (DN), Delay On (DO), Delay On (DOb), Interval (IN), Interval Leading (INb), Interval Trailing (INa), Symmetrical Recycler OFF/ON (RF) DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 8 A Screw 12 V ac/dc 265 V ac/dc
RS Stock No. 746-5176
Mfr. Part No.3RP1560-1SP30
BrandSiemens
$495.77
Each
units
24 V ac/dc, 200 → 240 V ac 1 → 20 s WYE Delta DIN Rail Single 3 - Seconds External 3PNO 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 828-5155
Mfr. Part No.LEDO 12-230V AC/DC
$69.60
Each
units
12 → 230 V ac/dc 0.1 s → 100 h ON Delay DIN Rail Single 1 - Hours, Minutes, Seconds External SPDT 8 A Screw 12 V ac/dc 265 V ac/dc
RS Stock No. 340-421
Mfr. Part No.H3Y-4 DC24 3M .
BrandOmron
$95.40
Each
units
24 V dc 0.1 → 3 min ON Delay DIN Rail, Surface Mount Single 4 H3Y-4 Minutes External - 5 A - - 250 V ac
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