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. 746-5173
Mfr. Part No.3RP1555-1AP30
BrandSiemens
MYR1,032.01
Each
units
24 V ac/dc, 200 → 240 V ac 0.5 → 10 s Clock Pulse DIN Rail Single 1 - Seconds External SPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 746-5148
Mfr. Part No.3RP1525-1BQ30
BrandSiemens
MYR616.54
Each
units
24 V dc, 100 → 127 V ac 1.5 → 30 s ON Delay DIN Rail Single 2 - Seconds External DPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 834-7509
Mfr. Part No.3RP1540-1BN31
BrandSiemens
MYR1,076.64
Each
units
200 → 240 V 0.05 → 600 s OFF Delay DIN Rail Single 2 - Seconds External DPDT 1 A Screw - -
RS Stock No. 392-7239
Mfr. Part No.3RP1505-1AP30
BrandSiemens
MYR804.13
Each
units
24 V ac, 24 V dc, 200 → 240 V ac 0.5 → 10 s - - Multi Function - - Seconds External SPDT - Screw - -
RS Stock No. 746-5117
Mfr. Part No.3RP1505-1AQ30
BrandSiemens
MYR804.13
Each
units
100 → 127 V ac, 24 V dc 0.15 → 3 s - DIN Rail Multi Function 1 - Seconds External SPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 831-6031
Mfr. Part No.3RP2525-1AW30
BrandSiemens
MYR363.64
Each
units
12 → 240 V ac/dc 0.05 s → 100 h ON Delay - Single 1 - Hours, Seconds - SPDT - Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 392-7188
Mfr. Part No.3RP1574-1NP30
BrandSiemens
MYR549.47
Each
units
200 → 240 V 1 → 20 s WYE Delta - Single 2 - Seconds External SPDT - Screw - -
RS Stock No. 834-7518
Mfr. Part No.7PV1512-1AP30
BrandSiemens
MYR165.00
Each
units
200 → 240 V 0.5 → 10 s ON Delay DIN Rail Single 1 - Seconds External SPDT 1 (dc) A, 3 (ac) A Screw - -
RS Stock No. 834-7515
Mfr. Part No.3RP2005-1BW30
BrandSiemens
MYR719.26
Each
units
24 → 240 V 0.05 s → 100 h Additive ON Delay With Control Signal, OFF Delay with Control Signal, OFF Delay/Instantaneous With Control Signal, ON Delay, ON Delay/Instantaneous Contact, ON Delay/OFF Delay/Instantaneous With Control Signal, Passing Break Contact With Control Signal, Passing Break Contact/Instantaneous With Control Signal, Passing Make Contact, Passing Make Contact/Instantaneous Contact, Pulse-Shaping /Instantaneous With Control Signal DIN Rail Multi Function 2 - Hours, Minutes, Seconds External DPDT 1 A Screw - -
RS Stock No. 831-6013
Mfr. Part No.3RP2511-2AW30
BrandSiemens
MYR291.39
Each
units
12 → 240 V ac/dc 0.5 → 10 s ON Delay - Single 1 - Seconds - SPDT - Cage Clamp 12 V ac/dc 240 V ac/dc
RS Stock No. 124-9405
Mfr. Part No.3RP2525-1BB30
BrandSiemens
MYR414.33
Each
units
Maximum of 24 V ac/dc 0.05 s → 100 h ON-Delay DIN Rail Single 2 3RP25 Hours, Seconds External DPDT 3 A Screw - 24 V ac/dc
RS Stock No. 746-5123
Mfr. Part No.3RP1505-1BT20
BrandSiemens
MYR973.91
Each
units
400 → 440 V ac 1.5 → 30 min - DIN Rail Multi Function 2 - Minutes External DPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 746-5136
Mfr. Part No.3RP1525-1AQ30
BrandSiemens
MYR549.47
Each
units
24 V dc, 100 → 127 V ac 0.05 → 1 s ON Delay DIN Rail Single 1 - Seconds External SPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 834-7495
Mfr. Part No.3RP1540-1AJ31
BrandSiemens
MYR929.23
Each
units
100 → 127 V 0.05 → 600 s OFF Delay DIN Rail Single 1 - Seconds External SPDT 1 A Screw - -
RS Stock No. 746-5110
Mfr. Part No.3RP1505-1AW30
BrandSiemens
MYR902.47
Each
units
24 → 240 V ac/dc 1.5 → 30 s - DIN Rail Multi Function 1 - Seconds External SPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 746-5189
Mfr. Part No.3RP1576-1NP30
BrandSiemens
MYR549.47
Each
units
24 V ac/dc, 200 → 240 V ac 3 → 60 s WYE Delta DIN Rail Single 2 - Seconds External SPNO 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 124-9410
Mfr. Part No.3RP2540-1AB30
BrandSiemens
MYR603.13
Each
units
Maximum of 24 V ac/dc 0.05 → 600 s, 1 → 20 s Off-Delay DIN Rail Single 1 3RP25 Seconds External SPDT 3 A Screw - 24 V ac/dc
RS Stock No. 392-7223
Mfr. Part No.3RP1505-1BP30
BrandSiemens
MYR800.85
Each
units
200 → 240 V ac, 24 V ac, 24 V dc 0.5 → 10 s - - Multi Function - - Seconds External DPDT - Screw - -
RS Stock No. 746-5145
Mfr. Part No.3RP1525-1BP30
BrandSiemens
MYR616.54
Each
units
24 V ac/dc, 200 → 240 V ac 0.05 → 1 min ON Delay DIN Rail Single 2 - Minutes External DPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 746-5114
Mfr. Part No.3RP1505-1BQ30
BrandSiemens
MYR915.81
Each
units
24 V dc, 100 → 127 V ac 5 → 100 s - DIN Rail Multi Function 2 - Seconds External DPDT 1 (dc) A, 3 (ac) A Screw 24 V ac/dc 250 V dc, 400 V ac