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. 905-3485
Mfr. Part No.TMSTA440
BrandLovato
HK$558.48
Each
units
380 → 440 V 0.1 s → 10 m Star Delta Time Relay DIN Rail Single 2 - Minutes, Seconds External DPNO 8 A Screw - -
RS Stock No. 905-3479
Mfr. Part No.TMPL
BrandLovato
HK$717.10
Each
units
12 → 240 V ac/dc 0.1 s → 100 days Flasher OFF, Flasher ON, Programmable Asymmetrical Recycle Time Relay DIN Rail Multi Function 2 - Days, Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 905-3463
Mfr. Part No.TMP
BrandLovato
HK$411.44
Each
units
24 → 240 V ac, 24 → 48 V dc 0.1 s → 10 days ON Delay Time Relay DIN Rail Single 2 - Days, Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 905-3488
Mfr. Part No.TMLS
BrandLovato
HK$427.92
Each
units
220 → 240 V ac 0.5 → 20 min Staircase Time Relay DIN Rail Single 1 - Minutes External SPNO 16 A Screw - -
RS Stock No. 905-3476
Mfr. Part No.TMST
BrandLovato
HK$558.48
Each
units
24 → 240 V ac, 24 → 48 V dc 0.1 s → 10 m Star Delta Time Relay DIN Rail Single 2 - Minutes, Seconds External DPNO 8 A Screw - -
RS Stock No. 176-9804
Mfr. Part No.TMM1NFC
BrandLovato
HK$727.34
Each
units
12 → 240 V ac/dc 0.1 s → 999 h OFF/ON DIN Rail Multi Function 2 - Seconds External SPDT - Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 905-3466
Mfr. Part No.TMM1
BrandLovato
HK$571.71
Each
units
12 → 240 V ac/dc 0.1 s → 10 days Flash Start with OFF, Flash Start with ON, OFF Delay, ON Delay, Pulse ON Relay DIN Rail Multi Function 2 - Days, Hours, Minutes, Seconds External SPDT 8 A Screw - -
RS Stock No. 905-3460
Mfr. Part No.TMM2
BrandLovato
HK$724.38
Each
units
12 → 240 V ac/dc 0.1 s → 10 days Flash Start with OFF, Flash Start with ON, OFF Delay, ON Delay, Pulse ON Relay DIN Rail Multi Function 3 - - External NO/CO 8 A Screw - -
RS Stock No. 905-3472
Mfr. Part No.TMD
BrandLovato
HK$884.01
Each
units
24 → 240 V ac/dc 0.06 → 180 s Delay ON, OFF Delay, True OFF Delay DIN Rail Multi Function 2 - Seconds External SPDT 5 A Screw - -