NEF437045 | Circuit Breaker | 45A | 3-Pole | 480V

The NEF437045 circuit breaker is a purpose-built solution for demanding industrial environments that rely on robust three-phase protection. With a 45A rating and a 3-pole design, it provides synchronized disconnection across all phases in 480V systems, helping safeguard equipment and maintain safe shutdowns during faults.

Why this model matters for your setup

• Precise compatibility: The part number NEF437045 serves as the primary reference for matching your equipment, making retrofit and replacement straightforward when the exact specification is required.
• Three-pole protection: A 3-pole configuration ensures all three phases trip together, reducing the risk of uneven loads and protecting three-phase circuits from partial faults.
• 480V industrial readiness: Designed for typical industrial distribution networks, this breaker supports common 480V systems found in manufacturing lines, facilities, and large machinery controls.
• Trusted 45A protection: The 45A rating is ideal for medium-load circuits and motor-driven equipment, offering reliable overcurrent protection without unnecessary nuisance tripping when properly applied.
• Maintenance, retrofit, and replacement: Built to meet continuing service needs, it supports ongoing maintenance programs and single-component upgrades without extensive panel modifications.

Use cases and applications

• Motor control centers (MCCs) and large equipment panels that run on 480V three-phase power
• Retrofit projects where old breakers require exact 3-pole, 480V, 45A specifications
• Maintenance workflows that demand quick, compatible replacements to minimize downtime
• New installations in industrial facilities seeking reliable, standards-aligned protection for critical circuits

How to verify fit and install with confidence

• Use the part number NEF437045 as your primary reference to confirm compatibility with your panel and distribution equipment.
• Ensure the circuit’s current demand aligns with a 45A rating and that the system voltage is 480V.
• Check that the breaker’s 3-pole configuration matches your busbar layout and the required shutdown behavior for all phases.
• Before ordering, double-check the surrounding enclosure space and the terminal arrangement to ensure a clean, proper fit.

Practical tips for installation and operation

• Coordinate with a qualified electrical professional to confirm electrical clearances and wiring terminations align with NEC guidelines.
• Plan for safe handling and de-energization procedures to protect personnel during replacement or maintenance.
• Document the replacement with the exact part number and ratings to assist future service and audits.

In environments where reliability and precise spec matching matter, the NEF437045 circuit breaker delivers predictable protection for 480V three-phase circuits. Its targeted amperage, three-pole design, and strict compatibility reference empower you to execute maintenance and upgrades with confidence, reducing downtime and preserving system integrity.