Siemens QJ23B125 - 125 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens QJ23B125 — a sturdy 125A, 240V, 3-pole bolt-on molded case circuit breaker crafted for dependable branch circuit protection in panelboards and loadcenters. Built to stand up to real-world electrical demand, it delivers consistent protection when it matters most.

Why this breaker stands out

• Secure bolt-on mounting creates a rigid, vibration-resistant connection to the bus, reducing movement and helping maintain reliable protection in challenging environments.
• Thermal-magnetic trip unit combines steady overload protection with fast magnetic response for short circuits, delivering stable, repeatable performance across a range of temperatures and loads.
• OEM-compatible design is engineered to work with matching Siemens load centers and panelboards, simplifying installation and reducing compatibility worries during replacements or upgrades.
• Ideal for residential, commercial, and light industrial applications where space is at a premium and dependable protection is non-negotiable.

Key specifications

• Manufacturer: Siemens
• Part Number: QJ23B125
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use and installation insights

This breaker excels in panelboards and loadcenters where a robust, OEM-aligned protection device is required. Its bolt-on design streamlines installation and offers a reliable, vibration-tolerant connection, making it a solid choice for retrofit projects and new builds alike.

Who should consider the Siemens QJ23B125? electrical professionals, facility managers, and maintenance teams seeking a proven, compatible solution for 3-phase or single-phase branch circuits that demand precise protection at the 125A level.

Tips for optimal results

• Verify panelboard compatibility with Siemens OEM load centers to ensure seamless integration.
• Use for circuits requiring 125A protection at 240V, particularly where three poles are needed for full coverage.
• Match with existing Siemens trip characteristics and mounting style to maintain consistent protection behavior across your electrical system.