Discount Siemens HF3B040 – 40A 3 Pole Molded Case Circuit Breaker

Engineered for commercial applications, the Siemens HF3B040 is a 3-pole, 40A molded case circuit breaker. As part of the legacy F-Frame family, it provides reliable thermal-magnetic protection for heavy-duty systems. This bolt-on MCCB installs into Siemens Sentron, P1, P2, and P3 panelboards, as well as compatible switchboards. For modern upgrades, it is replaced by the HHED63B040. Featuring a 65kAIC rating at 480VAC, it ensures robust fault clearing and includes load side lugs.