3VL3720-1NF46-0AA0 SIEMENS

The 3VL3720-1NF46-0AA0 is a robust 4-pole circuit breaker from Siemens, designed for reliable line protection in electrical systems. It is part of the VL250N series, known for its standard breaking capacity. This circuit breaker offers an Icu of 55kA at 415V AC, ensuring effective protection against short circuits and overloads. Equipped with an Electronic Trip Unit (ETU20), it provides precise and adjustable protection characteristics. The ETU20 features LSI functions, including overload protection (L), short-circuit protection with adjustable delay (S), and instantaneous short-circuit protection (I). The rated current (In) is 200A, with an adjustable overload protection range (IR) from 80A to 200A. The short-circuit protection (ISD) can be set from 1.5 to 10 times the IR value, while the instantaneous short-circuit protection (II) is fixed at 11 times the In value. This model includes N-conductor protection, enhancing safety and preventing neutral imbalances. It does not include an auxiliary release but is communication-capable, allowing for integration into monitoring and control systems. Auxiliary and alarm switches are not included in this configuration.