Eaton NFMI33D NRX Mechanical Interlock - UL Listed

The NFMI33D interlock leverages its NRX mechanical interlock design to prevent inadvertent breaker withdrawal, directly reducing maintenance-induced outages and enhancing plant safety. This feature translates into measurable uptime gains and lower risk exposure for technicians working on energized panels. The unit’s compact 9 inch depth, 2.25 inch height, and 4.5 inch width deliver space-efficient integration within standard NF frame enclosures, enabling easier retrofits and standardized installations across multiple panels. With a 5 pound weight and a robust one-year warranty, the interlock offers a dependable lifecycle that lowers total cost of ownership and simplifies procurement cycles for engineers and procurement teams. UL Listed certification reinforces compliance with recognized safety standards, supporting audits and regulatory alignment for critical protection systems. The included two-way cable Type 33 path provides wiring flexibility, reduces install time, and supports clean routing in congested panels. This solution is particularly valuable for Eaton NRX users seeking scalable protection across evolving NF-series configurations, while maintaining compatibility with existing interlock ecosystems and maintenance workflows. In practice, the NFMI33D accelerates commissioning, simplifies spare parts planning, and improves operator confidence during routine breaker maintenance and safety checks.