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Siemens Electrical Contactors – Suitable Protection for Every Application

Whether as single devices, as modules for load feeders or for installation in low-voltage distribution boards/switchboards – Siemens offers suitable contactors for every application as well as fully assembled contactor assemblies. What makes our SIRIUS devices unique: Their high contact reliability, extremely long service life and the possibility of using them even in the most extreme ambient conditions.
With a wide range of power contactors for switching motors, we can cover many different applications up to 250 kW. In sizes S00 to S12, in addition to standard 3 and 4-pole contactors, there are also vacuum contactors, coupling relays for optimal interfacing with the outputs of controllers, and various different 4-pole power relays and miniature contactors for the performance range up to 4 kW.

Midland Electric Supply offers the full line of Siemens electrical control products, so just give us a call if the component you are looking for is not presented on our website.

The new 3RT2 contactors in sizes S00 and S0 are particularly flexible. Apart from screw-type connections, the devices are also available throughout with spring-loaded and ring cable lug connections. The auxiliary switches for S00, S0 and S2 can be installed for any sizes. An AC/DC version can be controlled using either AC or DC voltage and simultaneously features much lower holding power of the coils. Two auxiliary switches are already integrated in the contactors of size S0 and S2 which offer even higher contact reliability.
A special highlight: Contactors in size S00, S0 and S2 can be used to configure star-delta (wye-delta) starters simply by plugging in function modules. These can also be equipped with an AS-i or IO-Link interface as an option, which significantly reduces the control circuit wiring. The 3RT2 series also offer some new safety features: Using the Safety connector, safety related solutions can be configured to PLe according to ISO13949-1 or SIL3 according to IEC62061 – simply plug the Safety connector into the contactors and a redundant contactor assembly is instantly wired.