Siemens BL B320 Three Phase Bolt On Circuit Breaker

Siemens B320 is a three-pole, 20-amp, 240-volt bolt-on molded‑case circuit breaker (Type BL) designed for panelboard mounting in three‑phase distribution. It features common‑trip operation with a thermal‑magnetic trip mechanism and carries a 10 kA short‑circuit interrupting rating at 240 V AC, with UL 489 listing and HACR suitability for HVAC loads in commercial/industrial panels. Built for Siemens BL panelboards, the B320 provides reliable protection across all three phases of a 240 V circuit and is part of Siemens’ molded‑case breaker family, compatible with panelboard mounting provisions and BL frame accessories for bolt‑on installation.