ITE | CM3B400 | Circuit Breaker | 400A | 3-Pole | 600V

ITE CM3B400 Circuit Breaker delivers robust overcurrent protection for three‑phase power systems. With a 400A rating, a 3‑pole configuration, and a 600V operating capacity, this breaker is built for demanding industrial and commercial environments. Designed for maintenance, retrofit, and replacement projects, it helps you keep critical equipment protected while aligning with OEM specifications.

Key specifications

• Amperage: 400A
• Pole configuration: 3‑Pole (three‑phase protection)
• Voltage rating: 600V
• Part number: CM3B400
• Recommended use: Maintenance, retrofit, and replacement where matching specs are required

Why this breaker stands out

Unlike generic substitutes, the CM3B400 is specifically chosen for compatibility with ITE panel setups and other systems that rely on accurate three‑phase protection. The 3‑pole design ensures simultaneous disconnection across all three phases, reducing the risk of phase imbalance and providing consistent shutdowns during fault conditions. The CM3B400 is identified by its part number, making it the most reliable reference when verifying fit for your panel or equipment.

Ideal applications

• Industrial control panels and motor feeders in manufacturing environments
• Large HVAC or cooling systems powered by three-phase networks
• Retrofit projects where legacy breakers require precise specs for safe operation
• Primary or secondary distribution panels in commercial facilities

Compatibility and installation guidance

Before ordering, confirm fit and ratings to ensure seamless replacement. Use the CM3B400 part number as the primary compatibility reference with your equipment label or documentation. Follow all standard safety practices when working with energized systems—power should be fully isolated, and only qualified personnel should perform replacements. When integrating into existing panels, verify that the voltage rating and three‑pole configuration match the system requirements and that mounting and wiring configurations align with your panel’s design.

Practical tips and considerations

• Use in applications with three‑phase loads up to 400A to ensure balanced protection across all phases.
• Pair with proper panel labeling and documentation to maintain clear maintenance records and code compliance.
• If frequent tripping occurs, revisit load distribution and motor startup currents to determine if a higher interrupting capacity or surge protection is warranted.
• Keep a reference spare on hand for quick maintenance or retrofit cycles to minimize downtime.