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. 177-0080
Mfr. Part No.H3DK-M2A DC12
BrandOmron
$181.41
Each
units
12 V dc 0.1 s → 100 h ON Delay DIN Rail Multi Function 2 H3DK Hours, Minutes, Seconds External DPDT 5 A Screw - 12 V dc
RS Stock No. 160-256
Mfr. Part No.G2ZS20 24-240V AC/DC
BrandTele
$162.60
Each
units
24 → 240 V ac/dc 40 ms → 3 min Star Delta Start Up DIN Rail Single 2 G2ZS20 Milliseconds, Minutes, Seconds External DPDT 5 A - - 250 V ac
RS Stock No. 177-0088
Mfr. Part No.H3CR-G8EL AC200-240
BrandOmron
$187.63
Each
units
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
RS Stock No. 897-6734
Mfr. Part No.RE22R2QGMR
$166.20
Each
units
24 → 240 V ac/dc 0.05 → 1 s, 0.3 → 3 s, 1 → 10 s, 10 → 100 s, 3 → 30 h, 3 → 30 min, 3 → 30 s, 30 → 300 h, 30 → 300 min, 30 → 300 s Star Delta DIN Rail Single 2 RE22 R2 Hours, Minutes, Seconds External DPDT 8 A Screw 24 V ac/dc 240 V ac/dc
RS Stock No. 831-6025
Mfr. Part No.3RP2512-2AW30
BrandSiemens
$98.21
Each
units
12 → 240 V ac/dc 1.5 → 30 s ON Delay - Single 1 - Seconds - SPDT - Cage Clamp 12 V ac/dc 240 V ac/dc
RS Stock No. 177-0100
Mfr. Part No.H3AM-NS-A-300 100-240VAC
BrandOmron
$526.25
Each
units
100 → 240 V ac 0.5 s → 30 h ON Delay Panel Mount Dual Function 2 H3AM Hours, Minutes, Seconds External DPDT 5 A Screw 100 V ac 240 V ac
RS Stock No. 746-6987
Mfr. Part No.1SVR730020R3300
BrandABB
$228.86
Each
units
24 → 240 V ac, 24 → 48 V dc 0.05 s → 300 h Accumulative ON Delay, Flash Start with OFF, Flash Start with ON, Impulse OFF with Auxiliary Voltage, Impulse ON, OFF Delay with Auxiliary Voltage, ON Delay, Pulse Former, Star Delta Changeover with Impulse, Symmetrical OFF Delay, Symmetrical ON Delay DIN Rail, Snap Multi Function 2 - Hours, Seconds External DPDT 4 A Screw 12 V 300 V ac
RS Stock No. 825-4549
Mfr. Part No.H3BA-N8H 110 VAC
BrandOmron
$184.47
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. 825-4545
Mfr. Part No.H3BA-N 110 VAC
BrandOmron
$172.40
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. 177-1030
Mfr. Part No.5TT3185
BrandSiemens
$215.17
Each
units
230 V ac - - - Multi Function - - - - SPDT 4 A Screw 12 V ac/dc 230 V ac/dc
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