NA390 | Circuit Breaker | 3-Pole | 240V

NA390 | Circuit Breaker | 3-Pole | 240V — a rugged, industrial-grade overcurrent protector designed for three-phase power systems.

In busy industrial panels, reliability matters. The NA390 is a 3-pole circuit breaker built to shut down a three-phase circuit safely at 240V, protecting downstream equipment from overloads and short circuits. This unit is particularly well-suited for maintenance work, retrofit projects, and replacement scenarios where exact specifications are required to maintain system performance and safety.

Key advantages and features

• Three-pole configuration provides balanced protection across all three phases in a typical 3-phase distribution
• Nominal voltage rating of 240V aligns with standard industrial power systems
• Part number NA390 serves as the primary compatibility reference for matching equipment
• Intended for use in maintenance, retrofit, and replacement tasks where exact specs are critical
• Compact, durable construction designed for factory floors, control panels, and electrical enclosures

Ideal use cases

• Replacing a failed breaker in three-phase panels without changing the panel architecture
• Retrofits where upgrading to a 3-pole 240V breaker is required to support upgraded equipment
• Maintenance planning with a known reference part number to minimize downtime
• Spare parts stocking for service fleets that manage 3-phase electrical systems

Important ordering note: Confirm fit and ratings before ordering. The part number is the best reference for compatibility — use NA390 to verify against your panel schedule, discontinuation notices, and manufacturer specs.

Practical tips for installation and care

• Match the breaker footprint and mounting style to your existing panel or enclosure to ensure secure installation
• Check electrical ratings on the panel label to confirm compatibility with 240V three-phase circuits
• Keep a labeled spare NA390 on hand for rapid service in critical equipment rooms