Overview
The Gould QJ3-B150 is a thermal-magnetic molded case circuit breaker manufactured by ITE (now part of Siemens). This 150-amp, 3-pole, 240VAC unit is built for dependable overcurrent protection in industrial control panels, machinery disconnects, and main service applications. The QJ3-B150 features bolt-on mounting, manual reset operation, and non-interchangeable trip elements for safety and system integrity.
Key Features
- 150-amp rated current with 10 kA standard interrupting capacity at 240VAC
- 3-pole configuration for three-phase or multi-circuit protection
- Thermal-magnetic trip mechanism with long-time and instantaneous functions
- Bolt-on mounting style for standard panelboard installation
- Manual reset operation with load-side lug terminals
- Non-interchangeable trip unit enhances system safety
Technical Specifications
- Model Number: QJ3-B150 (also listed as QJ3B150)
- Manufacturer: ITE Gould / Siemens
- Rated Current: 150A
- Voltage Rating: 240VAC
- Number of Poles: 3
- Interrupting Capacity: 10 kA @ 240VAC
- Trip Type: Thermal-Magnetic (LI)
- Mounting: Bolt-On
- Operation: Manual Reset On/Off
- Terminal Type: Screw / Load-Side Lugs
- Ambient Operating Temp: Up to 40°C (104°F)
- Series: QJ Type
- Current Type: AC
Typical Applications
The Gould QJ3-B150 is commonly used as a main service breaker or branch overcurrent protection device in:
- Industrial machinery and equipment control panels
- Motor disconnect and branch protection circuits
- Three-phase power distribution systems
- Facility electrical service upgrades and retrofits
- Legacy control system replacements and maintenance
Compatibility & Replacements
Compatible With
- Standard industrial panelboards rated for 240VAC, 150A main service
- ITE/Gould/Siemens QJ-series enclosures and switchgear
- Three-phase 240VAC distribution systems
- Legacy electrical systems using bolt-on circuit breaker mounting
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The QJ3-B150 may replace other obsolete ITE molded case breakers of the same voltage and amperage rating, but direct interchangeability should be confirmed with the original equipment documentation or an authorized distributor.
Works With
- Standard industrial panelboard bus bars and rails
- Thermal-magnetic trip coordination software and selective coordination studies
- Legacy Gould/ITE control systems and electrical infrastructure
- Manual or motorized main disconnect switches
