Zinsco HQB243015 Three-Pole Bolt-On Circuit Breaker

The Zinsco HQB24 / QB / HQB243015 is a three‑pole, 15‑amp bolt‑on molded‑case circuit breaker that provides overcurrent protection for 240 VAC circuits in industrial and commercial electrical distribution systems. It is typically installed in Zinsco bolt‑on panelboards and switchgear to protect three‑phase loads and equipment, and is used as a feeder or branch breaker for small motors, control circuits, and machinery in motor control systems. Key specifications include 3‑pole construction, 15 A rating, 240 VAC voltage rating, bolt‑on mounting, and a thermal‑magnetic trip for protection against overcurrents and short circuits; the unit is obsolete/discontinued. Common replacements include GE THQL32015 3‑Pole 15A Circuit Breaker.