Siemens | QJ3M090 | Circuit Breaker | 90A | 3-Pole | 240V | Bolt-On

The Siemens QJ3M090 circuit breaker is a purpose-built protection device for 3-phase electrical systems, delivering reliable overcurrent protection at 90A with a 240V rating. Its bolt-on mounting provides a sturdy, field-serviceable installation that’s ideal for retrofit work, maintenance, and replacement projects where these exact specs are required.

Key specifications at a glance

• Amperage: 90A
• Poles: 3-Pole
• Voltage: 240V
• Mounting: Bolt-On
• Part number reference: QJ3M090

Why choose the QJ3M090 for your panel? This 3-pole design ensures coordinated protection across all three phase lines, reducing the risk of unbalanced faults and providing a single-point disconnect for safer maintenance. The bolt-on style is favored in retrofit scenarios where existing panels require a secure, solid connection without complex chassis modifications.

Ideal use cases

• Maintenance and service of commercial or industrial 3-phase panels that operate at 240V
• Retrofits where current draw approaches 90A and reliable fault interruption is essential
• Replacement for a failed or aging unit with matching 3-pole, 240V, 90A specifications

Practical considerations for installation and compatibility

• Always verify fit and ratings before ordering; the part number is the most reliable compatibility reference.
• Ensure the panel or enclosure supports bolt-on mounting and matches the QJ frame style for seamless replacement.
• Plan for proper wiring practices and secure bushings/connectors to maintain safe, repeatable trips in fault conditions.

Designed with Siemens engineering standards, the QJ3M090 delivers dependable performance for demanding electrical environments. If your project requires a precise 90A, 3-pole, 240V bolt-on breaker with straightforward retrofit acceptance, this unit provides a clear, compatible solution that aligns with your maintenance and upgrade goals.