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. 106-6242
Mfr. Part No.H3DT-HBS
BrandOmron
$146.05
Each
units
24 → 48 V ac/dc 1 → 120 s Power OFF Delay DIN Rail Single 2 H3DT Seconds External SPDT 5 A Screw - 30 V dc, 250 V ac
RS Stock No. 834-7477
Mfr. Part No.3RP1512-1AQ30
BrandSiemens
$149.26
Each
units
100 → 127 V 1.5 → 30 s ON Delay DIN Rail Single 1 - Seconds External SPDT 1 A Screw - -
RS Stock No. 687-6096
Mfr. Part No.H5CX-A11-N
BrandOmron
$385.80
Each
units
100 → 240 V ac 0.001 s → 9999 h Cumulative, Interval, ON/OFF Duty Adjustable Flicker, Power ON Delay I, Power ON Delay II Repeat Cycle I, Repeat Cycle II, Signal OFF Delay, Signal ON Delay I, Signal ON Delay II, Stopwatch Panel Mount Multi Function 1 H5CX Hours, Seconds External - - 11-Pin Connector - -
RS Stock No. 177-0078
Mfr. Part No.H3DK-S1A DC12
BrandOmron
$73.49
Each
units
12 V dc 0.1 s → 100 h One Shot DIN Rail Multi Function 2 H3DK Hours, Minutes, Seconds External SPDT 5 A Screw - 12 V dc
RS Stock No. 106-6241
Mfr. Part No.H3DT-G
BrandOmron
$106.43
Each
units
24 → 240 V ac/dc 1 → 120 s Star-Delta DIN Rail Single 2 H3DT Seconds External SPDT 5 A Screw - 30 V dc, 250 V ac
RS Stock No. 872-5814
Mfr. Part No.RE22R2MJU
$356.31
Each
units
12 V ac/dc 0.1 s → 100 h Multi Function DIN Rail Multi Function 4 RE22 R2 Hours, Minutes, Seconds External DPDT 8 A Screw - -
RS Stock No. 897-6744
Mfr. Part No.RE22R2QEMT
$343.20
Each
units
380 → 415 V ac 0.3 → 30 s Star Delta DIN Rail Single 2 RE22 R2 Seconds External DPDT 8 A Screw 380 V ac 415 V ac
RS Stock No. 905-3463
Mfr. Part No.TMP
BrandLovato
$110.29
Each
units
24 → 240 V ac, 24 → 48 V dc 0.1 s → 10 days ON Delay Time Relay DIN Rail Single 2 - Days, Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 221-109
Mfr. Part No.80.21.0.240.0000
BrandFinder
$82.04
Each
units
24 → 240 V ac/dc 0.1 → 20 s, 0.1 → 20 min, 0.1 → 24 h Interval DIN Rail Single 1 80 Series Hours, Minutes, Seconds External SPDT 16 A Screw 16.8 V ac/dc 265 V ac/dc
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