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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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. 188-4578
Mfr. Part No.H3CR-F8 AC/DC24
BrandOmron
£86.30
Each
Units
24V ac/dc 0.05 s → 30h - - Single 2 H3CR Hours, Seconds External - 5A - - 30 V dc, 250V ac
RS Stock No. 113-8134
Mfr. Part No.H3CR-A AC100-240/DC100-125
BrandOmron
£57.70
Each
Units
100 → 125 V dc, 100 → 240V ac 0.05 s → 300h - - Multi Function 2 H3CR Hours, Seconds External - 5A 11-Pin Connector - 125 V dc, 250V ac
RS Stock No. 733-4953
Mfr. Part No.H3DK-S1 AC/DC24-240
BrandOmron
£31.06
Each
Units
24 → 240V ac/dc 0.1 s → 1200h - DIN Rail Multi Function - H3DK Hours, Minutes, Seconds - SPDT 5A Screw 24V 30 V dc, 250V ac
RS Stock No. 328-358
Mfr. Part No.H3CR-A8 AC100-240/DC100-125
BrandOmron
£57.70
Each
Units
100 → 125 V dc, 100 → 240V ac 0.05 s → 300h - - Multi Function 2 H3CR Hours, Seconds External - 5A - - 125 V dc, 250V ac
RS Stock No. 113-8128
Mfr. Part No.H3CR-A AC24-48/DC12-48
BrandOmron
£57.70
Each
Units
12 → 48 V dc, 24 → 48V ac 0.05 s → 300h - - Multi Function 2 H3CR Hours, Seconds External - 5A 11-Pin Connector - 125 V dc, 250V ac
RS Stock No. 328-364
Mfr. Part No.H3CR-A8 AC24-48/DC12-48
BrandOmron
£57.70
Each
Units
12 → 48 V dc, 24 → 48V ac 0.05 s → 300h - - Multi Function 2 H3CR Hours, Seconds External - 5A - - 125 V dc, 250V ac
RS Stock No. 365-6987
Mfr. Part No.H3DS-ML AC/DC
BrandOmron
£41.77
Each
Units
24 → 230 V ac, 24 → 48V dc 0.1 s → 120h - DIN Rail Multi Function 1 EF7616. Hours, Seconds External - 5A Screw - 30 V dc, 250V ac
RS Stock No. 733-4956
Mfr. Part No.H3DK-M1 AC/DC24-240
BrandOmron
£45.00
Each
Units
24 → 240V ac/dc 0.1 s → 1200h - DIN Rail Multi Function - H3DK Hours, Minutes, Seconds - SPDT 5A Screw 24V 30 V dc, 250V ac
RS Stock No. 188-4584
Mfr. Part No.H3CR-F8 AC100-240
BrandOmron
£86.30
Each
Units
100 → 240V ac 0.05 s → 30h - - Single 2 H3CR Hours, Seconds External - 5A - - 30 V dc, 250V ac
RS Stock No. 188-4613
Mfr. Part No.H3CR-H8L AC/DC24 M
BrandOmron
£76.80
Each
Units
24V ac/dc 0.05 → 12min - - Single 2 H3CR Minutes, Seconds External - 5A - - 30 V dc, 250V ac
RS Stock No. 348-1963
Mfr. Part No.H7ET-NFV-B
BrandOmron
£86.55
Each
Units
24 → 240V ac/dc - - - - - H7E - - - - - - -
RS Stock No. 687-6092
Mfr. Part No.H5CX-A-N
BrandOmron
£163.10
Each
Units
100 → 240V ac 0.001 s → 9999h - Panel Mount Multi Function 1 H5CX Hours, Seconds External - - Screw - -
RS Stock No. 328-386
Mfr. Part No.H3CR-A8E AC/DC24-48
BrandOmron
£66.10
Each
Units
24 → 48V ac/dc 0.05 s → 300h - - Multi Function 2 H3CR Hours, Seconds External - 5A - - 125 V dc, 250V ac
RS Stock No. 365-7003
Mfr. Part No.H3DS-AL AC/DC
BrandOmron
£30.52
Each
Units
24 → 230 V ac, 24 → 48V dc 0.1 s → 120h - DIN Rail Single 1 H3DS Hours, Seconds External - 5A Screw - 30 V dc, 250V ac
RS Stock No. 188-4629
Mfr. Part No.H3CRH8LAC200240M
BrandOmron
£76.80
Each
Units
200 → 240V ac 0.05 → 12min - - Single 2 H3CR Minutes, Seconds External - 5A - - 30 V dc, 250V ac
RS Stock No. 733-4928
Mfr. Part No.H3DK-F AC/DC24-240
BrandOmron
£65.20
Each
Units
24 → 240V 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 → 1200h - DIN Rail Multi Function - H3DK Hours, Minutes, Seconds - - 5A - - 24 V dc, 250V ac
RS Stock No. 687-6106
Mfr. Part No.H5CX-AD-N
BrandOmron
£163.10
Each
Units
12 → 24V ac/dc 0.001 s → 9999h - Panel Mount Multi Function 1 H5CX Hours, Seconds External - - Screw - -
RS Stock No. 340-392
Mfr. Part No.H3Y-4 DC24 10S
BrandOmron
£42.34
Each
Units
24V dc 0.5 → 10s - DIN Rail, Surface Mount Single 4 H3Y-4 Seconds External - 5A - - 250V ac
RS Stock No. 349-1279
Mfr. Part No.H3CR-H8L AC100-120 M
BrandOmron
£76.80
Each
Units
100 → 120V ac 0.05 → 12min - - Single 2 H3CR Minutes, Seconds External - 5A - - 30 V dc, 250V ac
RS Stock No. 236-1385
Mfr. Part No.H3YN-4 DC24
BrandOmron
£40.63
Each
Units
24V dc 0.1 s → 10min - - Multi Function 4 H3YN Minutes, Seconds External - 3A Socket - 250V ac