Timing relays

Electronic timing relays are used in control, starting, and protective circuits for all switching operations involving time delays. Thanks to their compact design, the 3RP20/25 timing relays are the ideal timer modules for industrial manufacturers of control cabinets, switchgear and control systems. Due to the narrow design, the 7PV15 timing relays are ideal in particular for use in heating, ventilation and air-conditioning systems and in compressors.

Technical specification for timing relays

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Timing relays portfolio


Industrial enclosure

Multifunctional timing relays for standard rail mounting - worldwide

The SIRIUS 3RP25 timing relays is a compact multifunctional timing relay for all common applications worldwide. Versions are available in standard width of 22.5 mm or space-saving widt of 17.5 mm. Up to 27 functions are integrated in the multifunctional timing relay - with a uniform wide voltage range of 12 to 240 V AC/DC.


Contactor design

Compact timing relays for installation on standard mounting rails

The use of SIRIUS 3RP20 timing relays is recommended in areas with low distances between mounting rails and/or low mounting depth, e.g. in switchboxes, due to their reduced height and mounting depth.


Installation design

Narrow timing relays for standard rail mounting in control cabinets and distribution boards

The SIRIUS 7PV15 timing relays in 17.5 mm enclosure are suitable for all standard applications and comply with the EMC requirements for residential areas. The changeover delay for wye-delta is adjustable from 50 ms to 1 s to ensure optimum adaptation to the respective application.

Function modules

For mounting on contactors

3RA28 function modules for assembling starters and contactor combinations for direct and wye-delta starting

They comprise all important control functions required for the respective feeder – e.g. timing and electric interlocking function. The function modules, which act as timing relays, can be rapidly and easily mounted on SIRIUS contactors and support both ON-delay and OFF-delay switching of contactors.

Time-delay auxiliary switches

For mounting on contactors

Solid-state time-delay 3RA28 auxiliary switches for contactor coil voltages

The solid-state time-delay auxiliary switches are designed for contactor coil voltages within the range of 24 to 240 V AC/DC (wide voltage range). Auxiliary switches for control and status signals are employed especially for switching very small signals for electronic applications.

They for example serve pump or fan over-travel similar to OFF delay timing relays or the delayed switch-on of a gate drive. Both the electrical and mechanical connection are realized by simply snapping the device on and locking it.

A varistor is integrated in the time-delay auxiliary switch to attenuate switching overvoltages in the contactor coil.

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