3WL air circuit breakers switch and protect motors, capacitors, generators, transformers, busbars, and cables. The modular design and uniform accessories make it possible to flexibly adapt the circuit breakers to different applications. Versions in accordance with UL 489 are available for international use. The electronic trip unit of the air circuit breakers is available in different versions. Protection, measuring, and communications functions are easy to implement, even in existing installations. A rating plug that is fast and easy to replace, for example, makes it possible to adjust the rated current without the time-consuming process of exchanging the converter. Expandable locking devices or mechanisms prevent accidental switching.
3WL air circuit breakers can be optionally equipped with a communications module and integrated into higher-level energy management systems. Auxiliary, signaling, and position switches report condition and fault diagnostics to higher-level control systems, even remotely.