The Cutler Hammer CHB330 is a 30A, 3-phase circuit breaker suitable for interior use. It features a plug-in/bolt-on mounting style with a maximum amperage of 30A. This main breaker from the trusted brand Cutler-Hammer offers overload and short circuit protection, making it ideal for branch circuit applications. With a voltage of 201-250V and an on/off operation method, this circuit breaker is a reliable and efficient choice for electrical systems requiring a high level of current.