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. 831-6003
Mfr. Part No.3RP2505-1BW30
BrandSiemens
HK$1,072.13
Each
units
12 → 240 V ac/dc 1 s → 100 h Multi Function - Multi Function 2 - Hours, Minutes, Seconds - DPDT - Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 746-5189
Mfr. Part No.3RP1576-1NP30
BrandSiemens
HK$673.78
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. 746-5145
Mfr. Part No.3RP1525-1BP30
BrandSiemens
HK$863.98
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. 470-7913
Mfr. Part No.3RP2005-1AP30
BrandSiemens
HK$819.00
Each
units
24 V ac/dc, 110 → 240 V ac 0.05 → 100 h, 0.05 → 100 min, 0.05 → 100 s Additive ON Delay with Auxiliary Voltage, Flash Start with Interval, OFF Delay with Auxiliary Voltage, ON Delay, ON Delay & OFF Delay with Auxiliary Voltage, Passing Break Contact with Auxiliary Voltage, Passing Make Contact, Pulse Former with Auxiliary Voltage DIN Rail Multi Function 1 - Hours, Minutes, Seconds External SPDT 1 (dc) A, 3 (ac) A Screw - 250 V ac/dc
RS Stock No. 392-7188
Mfr. Part No.3RP1574-1NP30
BrandSiemens
HK$673.78
Each
units
200 → 240 V 1 → 20 s WYE Delta - Single 2 - Seconds External SPDT - Screw - -
RS Stock No. 746-5136
Mfr. Part No.3RP1525-1AQ30
BrandSiemens
HK$673.78
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. 831-6007
Mfr. Part No.3RP2505-2AW30
BrandSiemens
HK$1,254.55
Each
units
12 → 240 V ac/dc 1 s → 100 h Multi Function - Multi Function 1 - Hours, Minutes, Seconds - SPDT - Cage Clamp 12 V ac/dc 240 V ac/dc
RS Stock No. 831-6025
Mfr. Part No.3RP2512-2AW30
BrandSiemens
HK$433.08
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. 746-5139
Mfr. Part No.3RP1505-2AW30
BrandSiemens
HK$1,225.36
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 Cage Clamp 24 V ac/dc 250 V dc, 400 V ac
RS Stock No. 746-5126
Mfr. Part No.3RP1505-1BW30
BrandSiemens
HK$1,428.78
Each
units
24 → 240 V ac/dc 0.5 → 10 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. 746-5120
Mfr. Part No.3RP1505-1RW30
BrandSiemens
HK$1,717.18
Each
units
24 → 240 V ac/dc 0.05 → 1 h - 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
RS Stock No. 834-7509
Mfr. Part No.3RP1540-1BN31
BrandSiemens
HK$1,394.64
Each
units
200 → 240 V 0.05 → 600 s OFF Delay DIN Rail Single 2 - Seconds External DPDT 1 A Screw - -
RS Stock No. 746-5151
Mfr. Part No.3RP1531-1AP30
BrandSiemens
HK$892.37
Each
units
24 V ac/dc, 200 → 240 V ac 0.5 → 10 s OFF 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. 171-8297
Mfr. Part No.3RP2505-2RW30
BrandSiemens
HK$1,699.08
Each
units
240 V ac/dc 0.05 → 100 h Multi Function DIN Rail 13 2 3RP25 Seconds External DPDT 3 A Push In 24 V ac/dc 240 V ac/dc
RS Stock No. 124-9393
Mfr. Part No.3RP2576-2NM20
BrandSiemens
HK$699.71
Each
units
200 → 240 V ac, 380 → 440 V ac 3 → 60 s Star Delta DIN Rail Single 2 3RP25 Seconds External DPNO 3 A Push In 200 V ac, 380 V ac 240 V ac, 440 V ac
RS Stock No. 831-6053
Mfr. Part No.3RP2540-1AW30
BrandSiemens
HK$1,114.93
Each
units
12 → 240 V ac/dc 0.05 → 600 s OFF Delay - Single 1 - Seconds - SPDT - Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 831-6057
Mfr. Part No.3RP2540-1BW30
BrandSiemens
HK$1,295.31
Each
units
12 → 240 V ac/dc 0.05 → 600 s OFF Delay - Single 2 - Seconds - DPDT - Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 171-8298
Mfr. Part No.7PV1508-1BW30
BrandSiemens
HK$510.37
Each
units
12 → 240 V ac/dc 0.05 → 360000 s OFF-Delay, ON-Delay, Pulse-Shaping DIN Rail 7 2 - Seconds External 2CO 3 A Screw 12 V ac/dc 240 V ac/dc
RS Stock No. 124-9410
Mfr. Part No.3RP2540-1AB30
BrandSiemens
HK$997.70
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. 124-9406
Mfr. Part No.3RP2525-2BB30
BrandSiemens
HK$692.71
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 Push In - 24 V ac/dc