Terasaki AT12 660VAC 3 Pole Air Circuit Breaker For Industrial Power Distribution

Terasaki AT12 660VAC 3-Pole Air Circuit Breaker is engineered for rugged industrial power distribution, delivering dependable protection and precise switching for low-voltage systems in demanding commercial and industrial facilities.

• Three-pole configuration provides balanced protection across all phases in 660VAC power networks, making it ideal for main incoming feeders and three-phase switchboards.
• 660VAC rating equips this air circuit breaker to handle the high demands of industrial power distribution while keeping critical circuits safeguarded against overloads and faults.
• Adjustable trip settings allow you to tailor protection thresholds to your specific load profiles and fault tolerances, reducing nuisance trips and protecting valuable equipment.
• Reliable protection for critical loads designed to support essential power distribution where downtime is costly, ensuring quicker fault isolation and safer operation.
• Low-voltage, heavy-duty performance built to withstand industrial environments, offering long-term durability and consistent operation in switchgear assemblies and distribution panels.

This AT12 breaker is particularly well-suited for main incoming feeders, large distribution boards, and applications where adjustable protection and a high interruption capability are required. If your facility relies on uninterrupted service for critical processes, machinery control rooms, or data-center-like environments, the AT12 provides a robust, scalable solution that integrates with existing electrical infrastructure.

Why choose the Terasaki AT12

What sets the AT12 apart is its combination of a sturdy air-break design with a 3-pole configuration and adjustable trip capability. This means you get precise control over protection levels, rapid interruption when faults occur, and the flexibility to adapt as your load and safety requirements evolve—without sacrificing reliability or ease of maintenance.

Practical use and maintenance tips

Install by qualified personnel in a suitable enclosure, verify correct three-phase wiring, and set the trip thresholds to reflect your system’s normal operating range. Regularly inspect for signs of wear, corrosion, or insulation degradation, and test the breaker periodically to confirm reliable operation under fault conditions. Use the AT12 as the main protection layer for feeders and switchboards to minimize downtime and protect downstream equipment.

Specifications at a glance

• Model / Part Number: AT12
• Voltage Rating: 660VAC
• Poles: 3-Pole
• Breaker Type: Air Circuit Breaker