Siemens SHJD6A400LSI Molded Case Circuit Breaker

The 400A rated current is a selection point for coordinating the breaker with the circuit load and conductor ampacity. Evaluate it together with the protection settings and applicable installation requirements.

The rated voltage is 600VAC. Select the breaker for an AC circuit whose voltage does not exceed that rating, and check the interrupting rating at the circuit's operating voltage.

The interrupting rating is 65kAIC at 480V and 35kAIC at 600V. Compare the available fault current at the installation point with the rating for that voltage; it must not exceed the applicable interrupting rating.

This three-phase breaker has three poles, allowing the three phase conductors to be interrupted together. Use the pole count when planning the circuit's conductor arrangement.

Both the mounting and terminal connections are bolt-on. Plan for bolted mechanical attachment and bolted electrical connections, with proper tightening procedures for each.

The adjustable electronic trip includes long-time, short-time and instantaneous functions. Long-time protection addresses sustained overcurrent, short-time protection introduces a delay for coordination, and instantaneous protection responds without intentional delay. Select settings to coordinate conductor protection and circuit operation.

UL approval is relevant when the project requires UL-approved electrical equipment. Include that approval in the selection review alongside the breaker's electrical ratings and protection functions.

RoHS and REACh address restricted substances and chemical compliance. They are relevant when project requirements include material restrictions in addition to electrical performance.