Siemens | QJ23B125HA02 | Circuit Breaker | 125A | 3-Pole | 240V | Bolt-On

Siemens QJ23B125HA02 is a 125A, 3-pole circuit breaker designed for 240V three‑phase systems. Built for maintenance, retrofit, and replacement projects where exact specification matching matters, this bolt‑on unit delivers secure, dependable protection in compatible panels.

• Bolt‑on mounting for a solid, vibration‑resistant connection in panels designed for bolt‑on breakers.
• 125A overload protection to safeguard feeders and interconnected equipment in 240V, three‑phase circuits.
• Three‑pole configuration provides coordinated protection across all three phases, helping prevent uneven loading and equipment damage.
• Precise compatibility with Siemens bolt‑on panels that accept QJ breakers; the part number QJ23B125HA02 is the best reference for matching your enclosure.
• Maintenance‑friendly replacement minimizes downtime when replacing worn or tripped devices in active electrical systems.

This breaker is ideal for:

• Maintenance or retrofit projects in commercial or industrial panels that require Siemens QJ bolt‑on devices.
• New installations needing reliable protection for 125A, 3‑phase, 240V circuits.
• Replacing existing breakers with exact ratings to maintain panel integrity and trip coordination.

Important compatibility notes: Confirm fit and ratings before ordering. The part number is the best reference for compatibility, so use QJ23B125HA02 to verify against your panel’s requirements.

Practical installation tips: Power down the system and follow all panel manufacturer guidelines when seating the breaker. Keep a spare on hand for quick maintenance or unexpected replacements, and ensure the panel is rated for bolt‑on Siemens QJ devices to maintain optimal protection and reliability.