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. 328-358
Mfr. Part No.H3CR-A8 AC100-240/DC100-125
BrandOmron
HK$566.50
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. 328-364
Mfr. Part No.H3CR-A8 AC24-48/DC12-48
BrandOmron
HK$548.72
Each
units
12 → 48 V dc, 24 → 48 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. 687-6109
Mfr. Part No.H5CX-L8-N
BrandOmron
HK$1,447.60
Each
units
100 → 240 V ac 0.001 s → 9999 h Flicker OFF Start 1, Flicker OFF Start 2, Flicker ON Start 1, Flicker ON Start 2 Panel Mount Multi Function 1 H5CX Hours, Seconds External - - 8-Pin Connector - -
RS Stock No. 188-4578
Mfr. Part No.H3CR-F8 AC/DC24
BrandOmron
HK$832.35
Each
units
24 V ac/dc 0.05 s → 30 h Flicker OFF DIN Rail, Flush Mount, Surface Mount Single 2 H3CR Hours, Seconds External - 5 A 8-Pin Connector - 30 V dc, 250 V ac
RS Stock No. 349-1279
Mfr. Part No.H3CR-H8L AC100-120 M
BrandOmron
HK$771.35
Each
units
100 → 120 V ac 0.05 → 12 min OFF Delay DIN Rail, Flush Mount, Surface Mount Single 2 H3CR Minutes, Seconds External - 5 A 8-Pin Connector - 30 V dc, 250 V ac
RS Stock No. 106-6255
Mfr. Part No.H3YN-21-B AC200-230
BrandOmron
HK$359.67
Each
units
200 → 230 V ac 0.1 min → 10 h Delay ON, Flicker OFF Start, Flicker ON Start Panel Mount Multi Function 4 H3YN Hours, Minutes External DPDT 5 A Push In - 250 V ac
RS Stock No. 188-4584
Mfr. Part No.H3CR-F8 AC100-240
BrandOmron
HK$832.35
Each
units
100 → 240 V ac 0.05 s → 30 h Flicker OFF DIN Rail, Flush Mount, Surface Mount Single 2 H3CR Hours, Seconds External - 5 A 8-Pin Connector - 30 V dc, 250 V ac
RS Stock No. 733-4953
Mfr. Part No.H3DK-S1 AC/DC24-240
BrandOmron
HK$312.29
Each
units
24 → 240 V ac/dc 0.1 s → 1200 h Flicker ON Start, Interval, ON Delay, One Shot Output DIN Rail Multi Function - H3DK Hours, Minutes, Seconds - SPDT 5 A Screw 24 V 30 V dc, 250 V ac
RS Stock No. 733-4937
Mfr. Part No.H3DKHBSACDC2448
BrandOmron
HK$616.55
Each
units
24 → 48 V ac/dc 0.1 → 1.2 s, 1 → 12 s OFF Delay DIN Rail Single - H3DK Seconds - - 5 A - - 30 V dc, 250 V ac
RS Stock No. 825-4577
Mfr. Part No.H3CR-F AC100-240/DC100-125
BrandOmron
HK$1,040.60
Each
units
100 → 125 V dc, 100 → 240 V ac 0.05 s → 300 h Flicker OFF Start DIN Rail, Flush Mount, Plug In Single 2 H3CR Hours, Minutes, Seconds External DPDT 5 A PCB Pin 100 V ac, 100 V dc 125 V dc, 240 V ac
RS Stock No. 236-1329
Mfr. Part No.H3YN-21 DC12
BrandOmron
HK$454.60
Each
units
12 V dc 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. 236-1458
Mfr. Part No.H3YN-41 AC200-230
BrandOmron
HK$408.54
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 4 H3YN Hours, Minutes External - 3 A Socket - 250 V ac
RS Stock No. 340-392
Mfr. Part No.H3Y-4 DC24 10S
BrandOmron
HK$487.66
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. 825-4545
Mfr. Part No.H3BA-N 110 VAC
BrandOmron
HK$869.11
Each
units
110 V ac 0.05 s → 300 h Flicker OFF Start, Flicker ON Start, Interval, ON Delay, Signal OFF Delay, Signal ON/OFF Delay Flush Mount, Panel Mount Multi Function 2 H3BA Hours, Minutes, Seconds External DPDT 5 A PCB Pin 100 V ac 240 V ac
RS Stock No. 825-4549
Mfr. Part No.H3BA-N8H 110 VAC
BrandOmron
HK$825.65
Each
units
110 V ac 0.05 s → 300 h ON Delay Flush Mount, Panel Mount Single 1 H3BA Hours, Minutes, Seconds External SPDT 5 A PCB Pin 100 V ac 240 V ac
RS Stock No. 733-4959
Mfr. Part No.H3DK-M2 AC/DC24-240
BrandOmron
HK$636.28
Each
units
24 → 240 V ac/dc 0.1 s → 1200 h Flicker OFF Start, Flicker ON Start, Interval, OFF Delay, ON Delay, ON/OFF Delay, One Shot Output DIN Rail Multi Function - H3DK Hours, Minutes, Seconds - - 5 A - - 30 V dc, 250 V ac
RS Stock No. 340-601
Mfr. Part No.H3Y-4 AC200-230 10S
BrandOmron
HK$408.50
Each
units
200 → 230 V ac 0.5 → 10 s ON Delay DIN Rail, Surface Mount Single 4 H3Y-4 Seconds External - 5 A - - 250 V ac
RS Stock No. 106-6240
Mfr. Part No.H3DT-F
BrandOmron
HK$618.20
Each
units
24 → 240 V ac/dc 0.1 s → 100 h Flicker OFF Start/Flicker ON Start DIN Rail Single 2 H3DT Hours, Minutes, Seconds External SPDT 5 A Screw - 30 V dc, 250 V ac
RS Stock No. 113-8134
Mfr. Part No.H3CR-A AC100-240/DC100-125
BrandOmron
HK$556.44
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. 733-4962
Mfr. Part No.H3DK-S2 AC/DC24-240
BrandOmron
HK$452.54
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