Terasaki AH 40C 4000A 660V Three Pole Air Circuit Breaker For Industrial And Commercial Power Distribution

The Terasaki AH-40C 4000A 660V Three-Pole Air Circuit Breaker is engineered to safeguard industrial and commercial power distributions with precise protection and dependable switching. Built for demanding low-voltage systems, this heavy-duty air circuit breaker delivers consistent performance in the heart of your facility’s electrical backbone.

Why the AH-40C Stands Out

• High interruption capacity: rated to interrupt 4000 A at 660 V, enabling reliable protection for feeders and critical loads during fault events without compromising system integrity.
• Three-pole, three-phase protection: ensures synchronized disconnection across all phases, preserving balance and preventing phase-related damage in large motor and process loads.
• Adjustable trip settings: tailor the protection curve to your specific installation, improving selectivity and coordination with upstream devices to minimize unnecessary outages.
• Rugged, air-insulated design: purpose-built for the industrial and commercial environments where resilience and long service life matter most.
• Strategic application: an ideal solution for main incoming feeders, switchboards, and critical power distribution where robust protection and reliable switching are essential.

Technical specifications at a glance

• Model/Part Number: AH-40C
• Current Rating: 4000 A
• Voltage Rating: 660 V
• Poles: 3-Pole
• Breaker Type: Air Circuit Breaker

Ideal Use Scenarios

• Main incoming feeders in industrial facilities where large fault currents must be contained quickly.
• Switchboards and distribution panels in commercial buildings requiring reliable three-phase protection.
• Critical power distribution setups in plants, data centers, and campuses that demand precise coordination and high interruption capacity.
• Upgrades to existing electrical systems where adjustable trip settings improve protection selectivity and reduce nuisance outages.

What You Gain with Terasaki AH-40C

When you choose the AH-40C, you’re investing in a protection device that not only meets the demand of heavy-load, low-voltage networks but also offers configurable protection to match your system’s unique characteristics. The three-pole design ensures balanced protection across phases, while the adjustable trip settings give you the flexibility to optimize protection coordination with upstream devices. This means faster fault isolation, reduced downtime, and safer operation for operators and equipment alike.

Designed for reliability in challenging environments, the AH-40C supports streamlined maintenance and clear diagnostics, helping you keep essential power distribution up and running with confidence. For facilities that rely on uninterrupted power to protect people, processes, and assets, this Terasaki breaker provides a durable, precise, and scalable solution.