Westinghouse HFB3070L Three-Phase Circuit Breaker

Westinghouse HFB3070L is a 70-amp, three-pole molded‑case circuit breaker designed for 600 V AC three‑phase systems. Cataloged as HFB3070L in Westinghouse’s Mark 75, Type HFB family, this 3P MCCB provides thermal‑magnetic protection with distinct long‑time and instantaneous trip functions and includes line and load lug terminals for straightforward wiring. It carries a 25 kA interrupting capacity at 480 V and supports bolt‑on mounting for secure installation in compatible panels, with an ambient temperature rating up to 40°C. The HFB designation reflects the Cutler Hammer/Westinghouse lineage, and this device is suited for protecting three‑phase circuits within 600 V class equipment in panel boards and distribution systems. This combination of a 70 A rating, 3P configuration, and robust thermal‑magnetic trip construction makes the HFB3070L a fit for legacy installations or new designs requiring reliable, code‑compliant protection for three‑phase feeders and branch circuits.