Circuit breaker
max. 100 A | SIRIUS 3RV Siemens Safety

SIRIUS 3RV motor starter protectors are compact, current-limiting circuit breakers up to 100 A for motor or starter protection. They guarantee safe disconnection in the event of a short circuit and protect loads and the system from overload. They are also suitable for normal switching duty with loads that have a small number of switching operations as well as for reliable isolation of the equipment from the supply system. We also offer: Circuit breakers in special versions, e.g. for plant protection - also according to UL/CSA, for transformer protection or overload relay functions.

The main circuit wiring can be significantly reduced by using different infeed possibilities, such as the associated SIRIUS 3RV infeed system, the three-phase busbar system, or the 8US busbar system.

There are special advantages when using circuit breakers of sizes S00 and S0 up to 40 A: For particularly flexible installation, the devices are available with screw-type, spring-loaded and ring cable lug connections. Thanks to the appropriate link modules, the circuit breakers of these sizes can be combined easily and quickly with SIRIUS switchgear: 3RT2 contactors, 3RF34 semiconductor switching devices or even 3RW30/40 soft starters. All circuit breakers of sizes S00 to S3 are uniformly equipped with rotary knob actuators which provide a clear distinction between the switch settings of OFF, ON and TRIPPED. In the 3RV2 motor starter protectors, the power losses are 5 to 10 % lower than for the previous models thanks to new bimetal technology. This plays an important role in reducing the temperature within the control cabinet.