Siemens | QJ3B110A02 | Circuit Breaker | 110A | 3-Pole | 240V | Bolt-On

Protect and power your three‑phase system with the Siemens QJ3B110A02 Circuit Breaker. Designed for reliability in 3‑pole, 240V configurations, this bolt‑on device is speak-direct compatible with Siemens panels that require the QJ bolt‑on family, making it an ideal choice for maintenance, retrofit, or replacement projects where exact specs matter.

Key specifications

• Amperage: 110 A
• Pole configuration: 3‑Pole
• Voltage rating: 240 V
• Mounting: Bolt‑On

Why choose the QJ3B110A02 for your panel

This Siemens breaker is purpose‑built for seamless integration with the QJ bolt‑on series, delivering precise compatibility through its part number being the best reference for fit. The 110 A rating provides robust protection for feeders and conductors in commercial and light industrial environments, while the 3‑pole design supports balanced, three‑phase circuits at 240V. The bolt‑on connection delivers a secure, vibration‑resistant termination that helps minimize nuisance tripping and connection loosening in demanding service conditions.

What problems it solves

• Reliable overload and short‑circuit protection for 3‑phase equipment in 240V systems.
• Efficient retrofit or replacement by matching the exact Siemens part number to your existing panel.
• Quicker service windows with a bolt‑on mounting that simplifies installation and reduces downtime.

Ideal use cases

Use this breaker when you need a precise Siemens replacement for a bolt‑on, 3‑pole, 240V application. It’s well suited for main feeders or branch circuits in Siemens panels that require the QJ style, enabling a straightforward upgrade path or component replacement without modifying the panel architecture.

Compatibility and installation tips

Always verify fit and ratings before ordering. The QJ3B110A02 part number is the most reliable reference for compatibility. Before installation, ensure your panel is designed for bolt‑on breakers in the QJ family and that the 3‑pole, 240V configuration matches your system requirements. Follow standard electrical safety practices and torque specs from the panel manufacturer or a licensed electrician.