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. 340-421
Mfr. Part No.H3Y-4 DC24 3M .
BrandOmron
$97.81
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
$174.26
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. 328-358
Mfr. Part No.H3CR-A8 AC100-240/DC100-125
BrandOmron
$160.97
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. 340-392
Mfr. Part No.H3Y-4 DC24 10S
BrandOmron
$94.45
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. 365-6987
Mfr. Part No.H3DS-ML AC/DC
BrandOmron
$98.83
Each
units
24 → 230 V ac, 24 → 48 V dc 0.1 s → 120 h Flicker OFF Start, Flicker ON Start, Interval, ON Delay, One Shot, Signal OFF Delay, Signal ON/OFF Delay DIN Rail Multi Function 1 EF7616. Hours, Seconds External - 5 A Screw - 30 V dc, 250 V ac
RS Stock No. 328-364
Mfr. Part No.H3CR-A8 AC24-48/DC12-48
BrandOmron
$174.26
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. 825-4558
Mfr. Part No.H3BA-NAC220V
BrandOmron
$157.42
Each
units
220 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. 733-4956
Mfr. Part No.H3DK-M1 AC/DC24-240
BrandOmron
$144.88
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 - SPDT 5 A Screw 24 V 30 V dc, 250 V ac
RS Stock No. 349-1279
Mfr. Part No.H3CR-H8L AC100-120 M
BrandOmron
$182.86
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. 733-4962
Mfr. Part No.H3DK-S2 AC/DC24-240
BrandOmron
$135.72
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
RS Stock No. 733-4934
Mfr. Part No.H3DKHBLACDC2448
BrandOmron
$208.86
Each
units
24 → 48 V ac/dc 1 → 12 s, 10 → 120 s OFF Delay DIN Rail Single - H3DK Seconds - - 5 A - - 30 V dc, 250 V ac
RS Stock No. 236-1183
Mfr. Part No.H3RN11DC12
BrandOmron
$97.77
Each
units
12 V dc 0 → 60 min Flicker OFF Start, Flicker ON Start Selectable by DIP Switch, Interval, ON Delay Panel Mount Multi Function 1 H3RN Minutes, Seconds External - 3 A Socket - 250 V ac
RS Stock No. 106-6268
Mfr. Part No.H3YN-41-B DC24
BrandOmron
$113.91
Each
units
24 V dc 0.1 min → 10 h Delay ON, Flicker OFF Start, Flicker ON Start Panel Mount Multi Function 8 H3YN Hours, Minutes External 4NO/4NC 3 A Push In - 250 V ac
RS Stock No. 825-4634
Mfr. Part No.H5CN-XCN AC100-240
BrandOmron
$514.01
Each
units
100 → 240 V ac, 12 → 48 V dc 1 s → 99.59 min ON Delay Flush Mount, Surface Mount Single 1 H5CN Minutes, Seconds External SPDT 3 A PCB Pin 12 V dc, 100 V ac 48 V dc, 240 V ac
RS Stock No. 733-4953
Mfr. Part No.H3DK-S1 AC/DC24-240
BrandOmron
$69.29
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. 188-4578
Mfr. Part No.H3CR-F8 AC/DC24
BrandOmron
$227.55
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. 106-6257
Mfr. Part No.H3YN-21-B DC12
BrandOmron
$113.91
Each
units
12 V dc 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. 106-6271
Mfr. Part No.H3RN-1-B DC12
BrandOmron
$98.09
Each
units
12 V dc 0.1 s → 10 min Delay ON, Flicker OFF Start, Flicker ON Start, Interval Panel Mount Multi Function 2 H3RN Minutes, Seconds External SPDT 3 A Plug In - 250 V ac
RS Stock No. 106-6256
Mfr. Part No.H3YN-21-B AC24
BrandOmron
$82.66
Each
units
24 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. 106-6258
Mfr. Part No.H3YN-21-B DC24
BrandOmron
$68.59
Each
units
24 V dc 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