Siemens | MQJ3100 | Circuit Breaker | 100A | 3-Pole | 240V | Bolt-On

The Siemens MQJ3100 circuit breaker is a factory-grade, three-phase protection device designed for reliable 240V systems. With a 100A rating and 3-pole configuration, this bolt-on breaker is ideal for maintenance, retrofit, and replacement projects where exact compatibility matters. The MQJ3100 ensures your panel protection remains consistent with the rest of the Siemens ecosystem.

• Amperage: 100 A
• Poles: 3-Pole
• Voltage rating: 240 V
• Mounting: Bolt-On
• Part number: MQJ3100

Why choose this Siemens MQJ3100 breaker? It’s a purpose-built replacement that aligns perfectly with Siemens panels and the MQJ-series family. The bolt-on design simplifies installation, reducing service time and the risk of mounting incompatibilities. By matching the exact amperage, pole count, and voltage, you preserve the intended protection profile and avoid unpredictable behavior in three-phase circuits.

Ideal use cases

• Maintenance or service on commercial or industrial panels that operate on three-phase 240V systems
• Retrofit projects where panel compatibility hinges on a Siemens MQJ-series or equivalent three-pole, 100A breaker
• Replacement for aging or failed 3-Pole 100A protection devices within multi-pole circuits

Compatibility and fit guidance: Always confirm fit and ratings before ordering. The MQJ3100 is the best reference for compatibility with your panel. Compare the part number, amperage, voltage, and pole count to your existing setup to ensure seamless interchangeability.

For professionals and technicians responsible for safeguarding electrical systems, the Siemens MQJ3100 delivers dependable, factory-backed interruption protection with straightforward installation. It’s the practical, durable choice for keeping three-phase equipment protected and running smoothly.