Siemens | QJ3B100H | Circuit Breaker | 100A | 3-Pole | 240V | Bolt-On

Meet the Siemens QJ3B100H, a purpose-built 3-pole circuit breaker engineered for demanding electrical systems. With a 100A rating and 240V operation, this bolt-on unit is designed for reliable protection in maintenance, retrofit, and replacement scenarios where exact specifications matter.

• Amperage: 100A
• Poles: 3-Pole
• Voltage: 240V
• Mounting: Bolt-On

Why this Siemens breaker stands out

What makes the QJ3B100H unique is its precise alignment with Siemens’ QJ series, delivering seamless compatibility in panels that rely on bolt-on, three-pole protection. The bolt-on design streamlines installation in compatible enclosures, delivering a secure, robust connection that holds up under vibration and routine maintenance cycles. Built for dependable trip characteristics, this unit helps minimize downtime by quickly interrupting abnormal currents and safeguarding motors, feeders, and multi-phase circuits.

Ideal use cases

• Retrofits in industrial or commercial panels that require a 3-pole, 240V protection scheme.
• Replacement for units within Siemens-compatible distributions where the QJ series is the standard reference.
• Maintenance upgrades to ensure current-carrying capacity and reliable short-circuit protection for multi-phase loads.

Compatibility and installation notes

For the best results, confirm fit and ratings before ordering. The part number QJ3B100H should be your primary reference when verifying compatibility with your panel and existing Siemens components. This is a bolt-on device, so ensure your enclosure supports bolt-on mounting and matches the QJ series footprint. If you’re upgrading or retrofitting, plan for proper synchronization with other protective devices in the same protection scheme to maintain coordinated protection.

What problems does it solve?

By providing precise overcurrent protection for three-phase circuits at 240V, this breaker helps prevent equipment damage, reduces the risk of electrical fires, and supports safer startup and shutdown procedures for motors and feeders. It’s an essential component for systems that require reliable, fast-acting interruption in the event of overloads or faults.

What to expect in real-world use

Users choose the Siemens QJ3B100H when they need a trusted, plug-in-compatible solution for Siemens-powered electrical infrastructure. Expect straightforward installation, predictable trip performance, and long-term serviceability within compatible panels—especially in retrofit projects where maintaining exact specifications matters for compliance and safety.