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Timer Relays

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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Part Details Brand 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 Depth Width Length Time Delay Switch Configuration Contact Material Maximum Operating Temperature Minimum Operating Temperature
Asymmetrical Recycling Timer, DPDT Broyce Control - - - - - - - - - - - - - - - - - - - - - -
Multi Attempt to Start Timer Broyce Control - - - - - - - - - - - - - - - - - - - - - -
NFC Timer Broyce Control - - - - - - - - - - - - - - - - - - - - - -
Omron One Shot Multi Function Time Delay Relay, Screw, 0.1 s → 100 h, SPDT, 2 Contacts, SPDT, 12 V dc Omron 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 100mm 79mm 22.5mm - SPDT - +55°C -20°C
Omron Flicker ON Start Multi Function Timer Relay, Crimp, 0.05 s → 300 h, DPDT, 2 Contacts, DPDT, 100 →
  • RS Stock No. 177-0095
  • Brand Omron
  • Mfr. Part No. H3CR-F8N 100-240VAC/100-125VDC
Omron 100 → 125 V dc, 100 → 240 V ac 0.05 s → 300 h Flicker ON Start DIN Rail Multi Function 2 H3CR Hours, Minutes, Seconds External DPDT 5 A Crimp 100 V ac/dc 125 V dc, 240 V ac 84mm 48mm 48mm - DPDT - +55°C -10°C
Tele Interval, Single Shot 7 Time Delay Relay, Screw, 500 ms → 100 h, NO, 1 Contacts, 24 → 240 V ac/dc
  • RS Stock No. 181-9089
  • Brand Tele
  • Mfr. Part No. E1ZMWt10 24-240VAC/DC
Tele 24 → 240 V ac/dc 500 ms → 100 h Interval, Single Shot DIN Rail 7 1 ENYA Hours, Milliseconds, Minutes, Seconds External NO 8 A Screw 24 V ac/dc 240 V ac/dc 87mm 65mm 17.5mm 10 s - - +55°C -25°C
Omron ON Delay Multi Function Time Delay Relay, Screw, 0.1 s → 120 h, SPDT, 2 Contacts, SPDT, 24 → 230 V Omron 24 → 230 V ac, 24 → 48 V dc 0.1 s → 120 h ON Delay DIN Rail Multi Function 2 H3DS Hours, Minutes, Seconds Internal SPDT 5 A Screw 24 V ac/dc 48 V dc, 230 V ac 74mm 80mm 17.5mm - SPDT - +55°C -10°C
Omron ON Delay Multi Function Timer Relay, Crimp, 0.05 s → 300 h, DPDT, 2 Contacts, DPDT, 100 → 125 V dc,
  • RS Stock No. 177-0098
  • Brand Omron
  • Mfr. Part No. H3CR-AP 100-240VAC/100-125VDC
Omron 100 → 125 V dc, 100 → 240 V ac 0.05 s → 300 h ON Delay DIN Rail Multi Function 2 H3CR Hours, Minutes, Seconds Internal DPDT 5 A Crimp 100 V ac/dc 125 V dc, 240 V ac 81.6mm 48mm 48mm - DPDT - +55°C -10°C
Omron Flicker ON Start Multi Function Timer Relay, Crimp, 0.05 s → 300 h, DPDT, 2 Contacts, DPDT, 12 → 48
  • RS Stock No. 177-0097
  • Brand Omron
  • Mfr. Part No. H3CR-FN AC24-48/DC12-48
Omron 12 → 48 V dc, 24 → 48 V ac 0.05 s → 300 h Flicker ON Start DIN Rail Multi Function 2 H3CR Hours, Minutes, Seconds External DPDT 5 A Crimp 12 V dc, 24 V ac 48 V ac/dc 84mm 48mm 48mm - DPDT - +55°C -10°C
Lovato OFF/ON Multi Function Time Delay Relay, Screw, 0.1 s → 999 h, SPDT, 2 Contacts, SPDT, 12 → 240 V Lovato 12 → 240 V ac/dc 0.1 s → 999 h OFF/ON DIN Rail Multi Function 2 - Seconds External SPDT - Screw 12 V ac/dc 240 V ac/dc 90mm 64.9mm 17.5mm - SPDT - +60°C -20°C
Omron ON Delay Multi Function Timer Relay, Crimp, 0.05 s → 300 h, DPDT, 2 Contacts, DPDT, 12 → 48 V dc,
  • RS Stock No. 177-0086
  • Brand Omron
  • Mfr. Part No. H3CR-AP AC24-48/DC12-48
Omron 12 → 48 V dc, 24 → 48 V ac 0.05 s → 300 h ON Delay DIN Rail Multi Function 2 H3CR Hours, Minutes, Seconds Internal DPDT 5 A Crimp 12 V dc, 24 V ac 48 V ac/dc 81.6mm 48mm 48mm - DPDT - +55°C -10°C
Omron ON Delay Time Delay Relay, Plug-In, 0.04 s → 3 h, DPDT, 2 Contacts, DPDT, 200 → 230 V ac
  • RS Stock No. 177-0107
  • Brand Omron
  • Mfr. Part No. H3Y-2 AC200-230 30S
Omron 200 → 230 V ac 0.04 s → 3 h ON Delay DIN Rail - 2 H3Y-2 Hours, Minutes, Seconds External DPDT 5 A Plug-In 200 V ac 230 V ac 56.6mm 28mm 21.5mm - DPDT - +50°C -10°C
Omron ON/OFF Delay Multi Function Time Delay Relay, Screw, 0.1 s → 100 h, SPDT, 2 Contacts, SPDT, 12 V dc Omron 12 V dc 0.1 s → 100 h ON/OFF Delay DIN Rail Multi Function 2 H3DK Hours, Minutes, Seconds External SPDT 5 A Screw - 12 V dc 100mm 79mm 22.5mm - SPDT - +55°C -20°C
Omron ON Delay Multi Function Time Delay Relay, Plug-In, 0.1 s → 10 min, DPDT, 2 Contacts, DPDT, 12 → 125 Omron 12 → 125 V dc, 24 → 230 V ac 0.1 s → 10 min ON Delay DIN Rail Multi Function 2 H3YN-2 Minutes, Seconds External DPDT 5 A Plug-In 12 V dc, 24 V ac 125 V dc, 230 V ac 56.6mm 28mm 21.5mm - DPDT - +50°C -10°C
Omron ON Delay Multi Function Time Delay Relay, Screw, 0.1 s → 120 h, 24 → 230 V ac/dc Omron 24 → 230 V ac/dc 0.1 s → 120 h ON Delay DIN Rail Multi Function - H3DS Hours, Minutes, Seconds Internal - 0.7 A Screw 24 V ac/dc 230 V ac/dc 74mm 80mm 17.5mm - - - +55°C -10°C
Omron ON Delay Time Delay Relay, Plug-In, 0.04 s → 3 h, DPDT, 2 Contacts, DPDT, 24 V dc Omron 24 V dc 0.04 s → 3 h ON Delay DIN Rail - 2 H3Y-2 Hours, Minutes, Seconds External DPDT 5 A Plug-In - 24 V dc 56.6mm 28mm 21.5mm - DPDT - +50°C -10°C
Omron Star-Delta Timer Multi Function Timer Relay, Crimp, 0.5 → 120 s, SPST, 1 Contacts, SPST, 200 → 240
  • RS Stock No. 177-0088
  • Brand Omron
  • Mfr. Part No. H3CR-G8EL AC200-240
Omron 200 → 240 V ac 0.5 → 120 s Star-Delta Timer DIN Rail Multi Function 1 H3CR Seconds External SPST 5 A Crimp 200 V ac 240 V ac 93mm 48mm 48mm - SPST - +55°C -10°C
Omron OFF Delay Multi Function Time Delay Relay, Screw, 1 → 120 s, SPDT, 2 Contacts, SPDT, 100 → 120 V ac
  • RS Stock No. 177-0082
  • Brand Omron
  • Mfr. Part No. H3DK-HCL 100-120VAC
Omron 100 → 120 V ac 1 → 120 s OFF Delay DIN Rail Multi Function 2 H3DK Seconds External SPDT 5 A Screw 100 V ac 120 V ac 100mm 79mm 22.5mm - SPDT - +55°C -20°C
Omron OFF Delay Multi Function Timer Relay, Crimp, 0.05 → 12 s, DPDT, 2 Contacts, DPDT, 200 → 240 V ac
  • RS Stock No. 177-0091
  • Brand Omron
  • Mfr. Part No. H3CR-HRL AC200-240 M
Omron 200 → 240 V ac 0.05 → 12 s OFF Delay DIN Rail Multi Function 2 H3CR Minutes, Seconds External DPDT 5 A Crimp 200 V ac 240 V ac 93mm 48mm 48mm - DPDT - +55°C -10°C
Omron ON Delay 8 Timer Relay, Screw, 0.1 s → 100 h, SPDT, 2 Contacts, SPDT, 12 → 240 V dc, 24 → Omron 12 → 240 V dc, 24 → 240 V ac 0.1 s → 100 h ON Delay DIN Rail 8 2 H3CA Hours, Minutes, Seconds External SPDT 3 A Screw 12 V dc, 24 V ac 240 V ac/dc 89mm 48mm 48mm - SPDT - +55°C -10°C
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