Siemens | QJ3B125HA01 | Circuit Breaker | 125A | 3-Pole | 240V | Bolt-On

Siemens QJ3B125HA01 circuit breaker delivers dependable protection for three‑phase 240V systems with a 125 A rating. This 3‑pole bolt‑on device is designed for maintenance, retrofit, and replacement projects where exact specifications and a seamless fit matter. If your panel requires a QJ bolt‑on breaker, this part number is the most reliable reference for compatibility.

Why this Siemens breaker stands out

Built for secure, durable performance in panels that accept QJ bolt‑on breakers, the QJ3B125HA01 combines robust mounting with clear electrical protection. The 3‑pole configuration ensures balanced protection across all three phases, helping protect connected equipment and maintain system integrity in 3‑phase installations.

Key specifications

• Amperage: 125 A
• Poles: 3‑Pole
• Voltage: 240 V
• Mounting method: Bolt‑On
• Part number: QJ3B125HA01

Ideal use cases

• Maintenance or retrofit projects in commercial or industrial panels distributing 3‑phase 240V loads
• Replacement for aging or incompatible breakers where exact 125 A, 3‑pole, bolt‑on specs are required
• Panel upgrades that demand precise compatibility with Siemens QJ bolt‑on breakers

Compatibility notes

Before ordering, confirm fit and ratings for your specific panel. The QJ3B125HA01 part number is the best reference for compatibility with Siemens panels designed to accept QJ bolt‑on breakers. If your equipment calls for a QJ bolt‑on device, this breaker provides a direct, reliable replacement path.

Practical installation tips

• Verify panel labeling and documentation to ensure the breaker's specifications align with your system requirements
• Follow your panel’s installation guide for proper bolt torque and lugs to ensure a secure, electrical‑safe connection
• Handle the breaker with care to preserve the trip mechanism and contact integrity for long‑term reliability