3VL4731-3SE36-0AA0 SIEMENS

The 3VL4731-3SE36-0AA0 is a robust 3-pole circuit breaker from Siemens, designed for line protection in electrical systems. As part of the VL400L series, it boasts a very high breaking capacity, with an ultimate short-circuit breaking capacity (Icu) of 100kA at 415V AC. This circuit breaker is equipped with an Electronic Trip Unit ETU20, offering advanced protection and control features. The ETU20 includes LSI functions, providing adjustable Long-time (overload) protection (IR), Short-time protection (ISD), and Instantaneous (short-circuit) protection (II). The rated current (In) is 315A, with an adjustable overload protection range (IR) from 128A to 315A. The short-time protection (ISD) can be set from 1.5 to 10 times the IR value, allowing for customized protection settings. The instantaneous short-circuit protection (II) is fixed at 11 times the rated current (In). This model does not include an auxiliary release or auxiliary/alarm switch, focusing on core circuit protection functionalities. It is suitable for applications requiring reliable and high-performance circuit protection against overloads and short circuits.