Siemens QJ23B150 - 150 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens QJ23B150 — a 150 A, 240 V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Built to endure the demands of residential, commercial, and light industrial environments, this breaker combines solid mechanical mounting with precise protection behavior you can trust.

Why the Siemens QJ23B150 stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, reducing the risk of loose contacts in busy panels and equipment rooms.
• Thermal-magnetic trip unit provides stable, repeatable protection by responding to both overload (thermal) and short-circuit (magnetic) conditions, helping to limit damage and downtime.
• OEM-compatible design ensures seamless integration with matching Siemens load centers and panelboards for reliable performance and straightforward replacement.
• Three-pole configuration suited for three-phase distribution, offering coordinated protection across all phases in commercial or light-industrial setups.
• 150 A, 240 V rating makes it well-suited for feeder protection and large branch circuits without compromising selectivity or speed of disconnection.

Technical snapshot

• Manufacturer: Siemens
• Part Number: QJ23B150
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 150 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical applications

This 3-pole bolt-on breaker is a practical choice for panelboards and load centers where robust protection and durable mounting matter. Use it to safeguard multi-wire branch circuits in residential basements with subpanels, or as a main feeder/protection device in commercial and light industrial electrical closets. Its OEM compatibility and secure bolt-on installation help ensure consistent performance in environments subject to vibration, temperature swings, or routine maintenance.

Installation and compatibility tips

• Pair with matching Siemens load centers or panelboards to maintain guaranteed fit and protection characteristics.
• Ensure proper torque on the bolt-on mounting to maximize bus connection integrity and minimize contact resistance over time.
• Confirm that 240 V and three-phase configurations align with your service requirements and panel specifications before installation.
• Follow applicable electrical codes and manufacturer's guidelines for safe handling, wiring, and testing after installation.

Why choose the Siemens QJ23B150

Designed for longevity and predictable performance, the Siemens QJ23B150 combines a rugged bolt-on chassis with a precise thermal-magnetic protection scheme. It’s the practical choice for installers and facility owners who demand reliable branch-circuit protection, straightforward compatibility with OEM panels, and a protection solution that performs consistently across varied load profiles and operating conditions.