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. 179-2983
BrandRS PRO
TWD1,255.00
Each
units
24V dc 0.1 → 3min - Plug In Single 4 - - - 4PDT 3A - - 24V dc
RS Stock No. 825-4549
Mfr. Part No.H3BA-N8H 110 VAC
BrandOmron
TWD3,175.00
Each
units
110V ac 0.05 s → 300h - - Single 1 H3BA Hours, Minutes, Seconds External SPDT 5A PCB Pin 100V ac 240V ac
RS Stock No. 459-4329
Mfr. Part No.CT2-E30 / L
BrandReleco
TWD2,855.00
Each
units
20 → 65V ac/dc 0.2 → 30 min, 0.2 → 30s - Plug In Single - - Minutes, Seconds External - - - 20V ac/dc 65V ac/dc
New
RS Stock No. 220-2588
Mfr. Part No.700-HNC44AA24
TWD1,970.00
Each
units
24V ac - - - Multi Function - - - - - - - - -
RS Stock No. 896-8670
Mfr. Part No.RE22R1HMR
TWD2,491.00
Each
units
24 → 240V ac/dc 0.05 → 1 s, 0.3 → 3 s, 1 → 10 s, 3 → 30 h, 3 → 30 min, 3 → 30 s, 10 → 100 s, 30 → 300 h, 30 → 300 min, 30 → 300s - DIN Rail Single 1 RE22 R1 Hours, Minutes, Seconds External SPDT 8A Screw 24V ac/dc 240V ac/dc
RS Stock No. 465-0609
Mfr. Part No.IK7817N.81/200 AC/DC12-240V 0.02s-300h
BrandDold
TWD5,010.00
Each
units
12 → 240V ac/dc 0.03 → 300 min, 0.06 → 30 s, 3 → 300h - DIN Rail Multi Function 1 IK7817N Hours, Minutes, Seconds External SPDT 4A - 12V ac/dc 240V ac/dc
RS Stock No. 123-2801
Mfr. Part No.84.02.0.230.0000
BrandFinder
TWD4,386.00
Each
units
110 → 240V ac/dc 0.1 s → 9999h - DIN Rail Multi Function 2 84 Series Hours, Minutes, Seconds External DPDT 16A Screw 110V ac/dc 240V ac/dc
New
RS Stock No. 220-2641
Mfr. Part No.700-HT12DU24
TWD3,263.00
Each
units
24V ac - - - Single - - - - - - - - -
RS Stock No. 489-7173
Mfr. Part No.1SVR500110R0000 CT-AHD.12
BrandABB
TWD2,232.00
Each
units
24 → 240 V ac, 24 → 48V dc 0.05 s → 100h - DIN Rail Single 1 - Hours, Seconds External SPDT 6A Screw 12V 250V
RS Stock No. 340-522
Mfr. Part No.H3Y-4 AC24 30M
BrandOmron
TWD1,877.00
Each
units
24V ac 1 → 30min - DIN Rail, Surface Mount Single 4 H3Y-4 Minutes External - 5A - - 250V ac
RS Stock No. 106-6249
Mfr. Part No.H3YN-2-B AC200-230
BrandOmron
TWD1,714.00
Each
units
200 → 230V ac 0.1 s → 10min - Panel Mount Multi Function 4 H3YN Minutes, Seconds External DPDT 5A Push In - 250V ac
RS Stock No. 106-6256
Mfr. Part No.H3YN-21-B AC24
BrandOmron
TWD2,438.00
Each
units
24V ac 0.1 min → 10h - Panel Mount Multi Function 4 H3YN Hours, Minutes External DPDT 5A Push In - 250V ac
RS Stock No. 857-7132
Mfr. Part No.DCB51CM24
TWD4,905.00
Each
units
24 V dc, 24 → 240V ac 0.1 s → 100h - DIN Rail Multi Function 2 - Hours, Minutes, Seconds External SPDT 5A Screw - -
RS Stock No. 746-7019
Mfr. Part No.1SVR730120R3100 CT-ARS.11S
BrandABB
TWD4,376.00
Each
units
24 → 240V ac/dc 0.05 s → 10min - DIN Rail Single 1 - Minutes, Seconds External SPDT 4A Screw 12V 300V ac
New
RS Stock No. 210-4288
Mfr. Part No.1SVR508020R1100 CT-MFC.21
BrandABB
TWD2,605.00
Each
units
12 - 240V ac 0.05 s - 100h - - Multi Function 2 CT-C - Internal - - - - -
RS Stock No. 124-9392
Mfr. Part No.3RP2576-1NM20
BrandSiemens
TWD3,731.00
Each
units
200 → 240 V ac, 380 → 440V ac 3 → 60s - DIN Rail Single 2 3RP25 Seconds External DPNO 3A Screw 200 V ac, 380V ac 240 V ac, 440V ac
RS Stock No. 106-6252
Mfr. Part No.H3YN-2-B DC24
BrandOmron
TWD1,714.00
Each
units
24V dc 0.1 s → 10min - Panel Mount Multi Function 4 H3YN Minutes, Seconds External DPDT 5A Push In - 250V ac
RS Stock No. 791-2758
Mfr. Part No.RE17RMXMU
TWD1,622.00
Each
units
24 V dc, 24 → 240V ac 1 s → 100h - DIN Rail Multi Function 2 RE17 Hours, Minutes, Seconds - SPDT 8A Screw 24V ac 24 V dc, 240V ac
RS Stock No. 159-537
Mfr. Part No.85.04.0.048.0000
BrandFinder
TWD2,133.00
Each
units
48V ac/dc 0.05 → 100 s, 3 → 100 min, 5 → 100h - Plug In Multi Function 4 85 Series Hours, Minutes, Seconds External 4PDT 7A - - 52.8V ac/dc
RS Stock No. 179-2906
BrandRS PRO
TWD3,649.00
Each
units
12 → 48V dc 99 h 59min - Plug In Single 1 - - External SPDT 5A - 12V dc 48V dc