3VA5440-0MU31-0AA0 SIEMENS

The 3VA5440-0MU31-0AA0 is a robust 3-pole molded case circuit breaker from Siemens' 3VA5 UL series, designed for motor starter protection. This circuit breaker has a frame size of 600 and a rated current (In) of 400A, making it suitable for demanding industrial applications. It features a TM120M trip unit, specifically configured for motor protection. The AM trip unit provides short-circuit protection with an instantaneous tripping current (Ii) adjustable from 3 to 6 times the rated current (In). This allows for precise coordination with motor starting characteristics, preventing nuisance tripping while ensuring effective fault protection. The breaker is designed without overload protection, focusing solely on short-circuit events. This configuration is ideal for applications where separate overload relays handle thermal protection. The 3VA5440-0MU31-0AA0 does not include connection terminals, offering flexibility in choosing the appropriate connection method for the specific installation. This circuit breaker provides reliable and fast protection against short circuits, enhancing the safety and longevity of motor-driven equipment. Its UL certification ensures compliance with North American safety standards. The absence of overload protection allows for tailored protection schemes in motor starter applications.