Siemens offers new 3WL10 circuit breaker in compact size 0

22 November 2017

With the 3WL10, Siemens has developed a new air circuit breaker in the especially compact size 0 that can handle rated currents of up to 1,250 amperes (A). With this development, Siemens has closed the last gap in the portfolio and now offers circuit breakers for nearly every application, in four sizes and five performance classes from 630 to 6,300 A. The 3WL10 communication-capable circuit breakers reduce space requirements in the switchgear to a minimum. With two individual electronic trip units and various connection options, they can be installed in switchgear in accordance with IEC61439- and be integrated in energy management systems via communications modules and the internal metering function.

Circuit breakers are the heart of the electrical power distribution and reliably protect electrical installations against damage or fire as a result of short circuits, ground faults, or overload faults. 3WL air circuit breakers from Siemens act as incoming-feeder, distributor, coupler, and outgoing-feeder circuit breakers in electrical systems in industry, buildings, and infrastructure applications. They switch all operational and fault currents and protect motors, capacitors, generators, transformers, busbars, and cables. Thanks to this expansion of the 3WL portfolio, Siemens now covers the power range from 630 A to 6,300 A in four different sizes. The entire portfolio can be used worldwide up to 70°C (without derating up to 55°C) and complies with IEC-60947-2 and DIN VDE 0690 part 1. Furthermore, all circuit breakers with functions for communication and energy data acquisition can be configured via Profibus or Modbus.