Siemens | HQJ23B125H00S01 | Circuit Breaker | 125A | 3-Pole | 240V | Bolt-On

Siemens HQJ23B125H00S01 is a 125-amp, 3-pole, 240-volt bolt-on circuit breaker designed for reliable overcurrent protection in demanding electrical environments. Built for maintenance, retrofit, and replacement projects, this breaker delivers precise performance where exact specifications matter most.

Key specifications

• Amperage: 125A
• Poles: 3-Pole
• Voltage: 240V
• Mounting: Bolt-On
• Part number: HQJ23B125H00S01

Why this matters

When upgrading or repairing a Siemens electrical system, compatibility is essential. This bolt-on 125A three-pole breaker is engineered to fit precise panel configurations and deliver dependable protection for three-phase circuits at 240V. Using the exact part number HQJ23B125H00S01 helps ensure you’re sourcing a component that aligns with the original design, reducing the risk of misfits and trips in critical applications.

Ideal use cases

• New installations in commercial or light industrial panels that require three-phase protection at 240V.
• Retrofits to replace aging breakers without altering enclosure hardware.
• Maintenance and spare parts planning for Siemens-based electrical systems that run on 240V three-phase power.

Installation and compatibility

Before ordering, confirm fit and ratings to match the specific Siemens panel or distribution board. The part number HQJ23B125H00S01 is the best reference for compatibility. Follow standard lockout/tagout procedures, ensure power is fully isolated, and use appropriate torque and mounting methods for bolt-on connections as outlined in your panel’s installation guide.

Care and best practices

• Keep spare breakers organized with their corresponding panel locations to simplify future maintenance.
• Inspect for signs of wear, overheating, or corrosion during routine checks; replace if integrity is compromised.
• Label circuits clearly after installation to support safe operation and future servicing.

Designed to deliver consistent protection in Siemens systems, this 125A 3-Pole 240V bolt-on circuit breaker offers a precise, durable solution for upgraded panels, reliable retrofits, and long-term replacement strategy.