Timer Relays

A timer relay is a control element that counts a set time when the supply or trigger signal is applied or removed and picks up or drops out the output contact with a delay. It is used in control panels to determine the changeover time in star-delta starting, to switch fans and pumps on and off with a delay, and to sequence steps in machines. The subgroups are divided by function: besides single- and multi-function models, there are off-delay, flasher, star-delta, left-right and programmable timer relays. Directly in this category, relays coded Siemens 3RP25 and 7PV15, ABB CT and Schneider Electric RE22 are listed; the subgroups mostly contain Tense models. Choose the timer relay first according to the function the circuit requires (on-delay, off-delay, flasher or star-delta), then according to the setting range, supply voltage, number and current of contacts, and mounting type. For off-delay operation, some models require a continuous supply and a separate trigger input; verify the wiring diagram from the product data.

Products

How to choose Timer Relays

A timer relay is a control element that counts a set time when the supply or trigger signal is applied or removed and picks up or drops out the output contact with a delay. It is used in control panels to determine the changeover time in star-delta starting, to switch fans and pumps on and off with a delay, and to sequence steps in machines.

  • Separate sensing, motion control, logic processing and operator interface requirements.
  • Select signal type, supply voltage, communication protocol and I/O count for the machine network.
  • Verify housing size, sensing distance and PNP/NPN output polarity against the PLC input card.

Frequently asked questions

What is Timer Relays and where is it used?

A timer relay is a control element that counts a set time when the supply or trigger signal is applied or removed and picks up or drops out the output contact with a delay. It is used in control panels to determine the changeover time in star-delta starting, to switch fans and pumps on and off with a delay, and to sequence steps in machines.

What should I compare when choosing Timer Relays?

Choose the timer relay first according to the function the circuit requires (on-delay, off-delay, flasher or star-delta), then according to the setting range, supply voltage, number and current of contacts, and mounting type.

Which product groups are available under Timer Relays?

The current subcategories include Dishwasher Timer Relays, Flasher Timer Relays, Forward-Reverse Timer Relays, Multi-Function Timer Relays, Off-Delay Timer Relays, Precision Adjustable Timer Relays. Open a subcategory to compare its products and technical details.

Timer Relays Selection Guide