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. 160-262
Mfr. Part No.E1ZMQ10 24-240V AC/DC
BrandTele
$76.51
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
$74.33
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
$491.30
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. 896-6813
BrandRS PRO
$67.18
Each
units
12 240 V ac/dc 0.1 s 100 h Multi Function DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 6 A Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 536-2779
BrandRS PRO
$79.08
Each
units
250 V ac 0 → 120 min - Panel Mount - - - - External - - - - -
RS Stock No. 828-5155
Mfr. Part No.LEDO 12-230V AC/DC
$68.97
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
RS Stock No. 113-8134
Mfr. Part No.H3CR-A AC100-240/DC100-125
BrandOmron
$188.80
Each
units
100 → 125 V dc, 100 → 240 V ac 0.05 s → 300 h Flicker OFF Start, Flicker ON Start, Interval, ON Delay, One Shot, Signal OFF Delay, Signal ON/OFF Delay DIN Rail, Flush Mount, Surface Mount Multi Function 2 H3CR Hours, Seconds External - 5 A 11-Pin Connector - 125 V dc, 250 V ac
RS Stock No. 774-0317
Mfr. Part No.88827125
BrandCrouzet
$119.07
Each
units
24 240 V ac, 24 V dc 0.1 s 100 h ON Pulse Timer DIN Rail Single 1 - Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 774-0308
Mfr. Part No.88827115
BrandCrouzet
$106.10
Each
units
24 240 V ac, 24 V dc 0.1 s 100 h ON Delay DIN Rail Single 1 - Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 791-2723
Mfr. Part No.RE17RCMU
$119.30
Each
units
24 240 V ac, 24 V dc 0.1 s 100 h OFF Delay DIN Rail Single 2 RE17 Hours, Minutes, Seconds - SPDT 8 A Screw 24 V ac 24 V dc, 240 V ac
RS Stock No. 774-0304
Mfr. Part No.88827105
BrandCrouzet
$134.84
Each
units
24 240 V ac, 24 V dc 0.1 s 100 h Asymmetrical, Interval, OFF Delay, ON Delay, ON Pulse, Symmetrical DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 328-358
Mfr. Part No.H3CR-A8 AC100-240/DC100-125
BrandOmron
$170.56
Each
units
100 → 125 V dc, 100 → 240 V ac 0.05 s → 300 h Flicker ON Start, Interval, ON Delay, One Shot DIN Rail, Flush Mount, Surface Mount Multi Function 2 H3CR Hours, Seconds External - 5 A 8-Pin Connector - 125 V dc, 250 V ac
RS Stock No. 791-2711
Mfr. Part No.RE17RAMU
$73.19
Each
units
24 240 V ac, 24 V dc 0.1 s 100 h ON Delay 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. 896-6879
BrandRS PRO
$160.01
Each
units
110 240 V ac 0.1 s 999 Days Multi Function Panel Mount Multi Function 2 - Days, Hours, Minutes, Seconds External DPDT 5 A PCB Pin 110 V ac 240 V ac
RS Stock No. 896-6872
BrandRS PRO
$169.76
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. 914-4597
Mfr. Part No.LEDO/2 12-230V AC/DC
$52.66
Each
units
12 → 230 V ac/dc 0.1 s → 100 h ON Delay DIN Rail - 2 - Hours, Minutes, Seconds External DPDT 8 A Screw 12 V ac/dc 230 V ac/dc
RS Stock No. 818-4563
Mfr. Part No.1CMDT0
BrandGIC
$75.18
Each
units
12 → 240 V ac/dc 0.1 s → 100 h Accumulative Delay On Signal, Cyclic OFF/ON, Cyclic ON/OFF, Impulse ON/OFF, Leading Edge Bi-stable, Leading Edge Impulse, Signal OFF/ON, Signal ON/OFF Delay, Trailing Edge Impulse DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 6 A Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 340-392
Mfr. Part No.H3Y-4 DC24 10S
BrandOmron
$167.61
Each
units
24 V dc 0.5 → 10 s ON Delay DIN Rail, Surface Mount Single 4 H3Y-4 Seconds External - 5 A - - 250 V ac
RS Stock No. 746-6993
Mfr. Part No.1SVR730040R3300
BrandABB
$165.07
Each
units
24 240 V ac, 24 48 V dc 0.05 s 300 h Adjustable Impulse with Fixed Time Relay, Fixed Impulse with Adjustable Time Relay, Flash Start with OFF, Flash Start with ON, Impulse ON, ON Delay DIN Rail Multi Function 2 - Hours, Seconds External DPDT 4 A Screw 12 V 300 V ac
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