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. 536-2555
BrandRS PRO
$86.06
Each
units
250 V ac 0 30 min - Panel Mount - - - - External - - - - -
RS Stock No. 914-8221
Mfr. Part No.RE17RMMWS
$126.55
Each
units
12 240 V ac/dc 1 s 100 h OFF Delay DIN Rail Multi Function 1 RE17 Hours, Minutes, Seconds External SPDT 8 A Cage Clamp 12 V ac/dc 240 V ac/dc
RS Stock No. 733-4962
Mfr. Part No.H3DK-S2 AC/DC24-240
BrandOmron
$145.11
Each
units
24 → 240 V ac/dc 0.1 → 1.2 s, 1 → 12 h, 1 → 12 min, 1 → 12 s, 10 → 120 h, 10 → 120 min, 10 → 120 s, 100 → 1200 h Flicker ON Start, Interval, ON Delay, One Shot Output DIN Rail Multi Function - H3DK Hours, Minutes, Seconds - - 5 A - - 30 V dc, 250 V ac
RS Stock No. 467-6869
Mfr. Part No.88886016
BrandCrouzet
$188.76
Each
units
12 240 V dc, 24 240 V ac 0.02 300 h, 0.02 300 min, 0.02 300 s A, AC, B, BW, C, G, W Plug In Multi Function 2 - Hours, Minutes, Seconds External DPDT 5 A 11-Pin Connector 12 V dc, 24 V ac 240 V ac/dc
RS Stock No. 236-1357
Mfr. Part No.H3YN-21 AC200-230
BrandOmron
$147.79
Each
units
200 → 230 V ac 0.1 min → 10 h Flicker OFF Start, Flicker ON Start, Interval, ON Delay DIN Rail, Flush Mount Multi Function 2 H3YN Hours, Minutes External - 5 A Socket - 250 V ac
RS Stock No. 896-8682
Mfr. Part No.RE22R1DMR
$131.09
Each
units
24 240 V ac/dc 0.05 1 s, 0.3 3 s, 1 10 s, 3 30 h, 3 30 min, 3 30 s, 10 100 s, 30 300 h, 30 300 min, 30 300 s Symmetrical DIN Rail Single 1 RE22 R1 Hours, Minutes, Seconds External SPDT 8 A Screw 24 V ac/dc 240 V ac/dc
RS Stock No. 746-5154
Mfr. Part No.3RP1532-1AP30
BrandSiemens
$249.76
Each
units
24 V ac/dc, 200 240 V ac 1.5 30 s OFF Delay DIN Rail Single 1 - Seconds External SPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 442-9382
Mfr. Part No.1SVR550167R1100
BrandABB
$97.77
Each
units
24 V ac/dc, 200 240 V ac 0.1 10 s Flash DIN Rail Single 1 - Seconds External SPDT - - - -
RS Stock No. 362-4081
Mfr. Part No.M1ESDO 24-230VAC/DC
$68.13
Each
units
24 230 V ac/dc 1 10 min ON Delay DIN Rail Single - MK7850N Minutes External - 500 mA Connector 24 V ac/dc 230 V ac/dc
RS Stock No. 877-8082
Mfr. Part No.2901477
$79.68
Each
units
- 3 → 300 s Switch ON Delay DIN Rail Single 2 ETD-BL-1T-ON-300S-PT Seconds External SPDT - Screw 19.2 V dc 30 V dc
RS Stock No. 791-2705
Mfr. Part No.RE17LHBM
$101.55
Each
units
24 240 V ac 0.1 s 100 h ON Delay DIN Rail Single - RE17 Hours, Minutes, Seconds - - 0.7 A Screw 24 V ac 240 V ac
RS Stock No. 897-6725
Mfr. Part No.RE22R2MYMR
$244.10
Each
units
24 240 V ac/dc 0.05 1 s, 0.3 3 s, 1 10 s, 3 30 h, 3 30 min, 3 30 s, 10 100 s, 30 300 h, 30 300 min, 30 300 s OFF Delay, ON Delay DIN Rail Multi Function 2 RE22 R2 Hours, Minutes, Seconds External DPDT 8 A Screw 24 V ac/dc 240 V ac/dc
RS Stock No. 859-3402
Mfr. Part No.PCB01DM24
$375.72
Each
units
24 240 V ac/dc 0.1 s 100 h Asymmetrical Recycler with Pulse Start Plug In Multi Function 2 - Hours, Minutes, Seconds External SPDT 8 A Plug In - -
RS Stock No. 791-2733
Mfr. Part No.RE17RMEMU
$150.93
Each
units
24 240 V ac, 24 V dc 0.1 s 10 h - DIN Rail Multi Function 2 RE17 Hours, Minutes, Seconds - SPDT 8 A Screw 24 V ac 24 V dc, 240 V ac
RS Stock No. 774-0332
Mfr. Part No.88827185
BrandCrouzet
$136.33
Each
units
24 240 V ac, 24 V dc 0.1 s 100 h Flip Flop, Impulse Counter, ON Delay, Safe Guard, Timed Impulse Relay DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 834-7470
Mfr. Part No.3RP1511-2AP30
BrandSiemens
$148.02
Each
units
200 240 V 0.5 10 s ON Delay DIN Rail Multi Function 1 - Seconds External SPDT 1 A Cage Clamp - -
RS Stock No. 666-7946
Mfr. Part No.38.21.0.024.0060
BrandFinder
$79.79
Each
units
24 V ac/dc 0.1 s → 6 h ON Delay, ON Pulse DIN Rail Multi Function - 38 Series Hours, Seconds External - 10 A Screw 250 V ac 400 V ac
RS Stock No. 831-6075
Mfr. Part No.3RP2576-1NW30
BrandSiemens
$126.60
Each
units
12 240 V ac/dc 3 60 s Star Delta - Single 2 - Seconds - DPNO - Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 774-0323
Mfr. Part No.88827155
BrandCrouzet
$142.75
Each
units
24 240 V ac, 24 V dc 0.1 s 100 h Asymmetrical DIN Rail Single 1 - Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 433-3966
Mfr. Part No.88901372
BrandCrouzet
$124.62
Each
units
24 V dc 0.5 → 10 min ON Delay Panel Mount Single - - Minutes External - 200 mA Screw - -
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