Terasaki AT20 2000A 690 VAC 3 Pole Air Circuit Breaker For Low Voltage Power Distribution

Meet the Terasaki AT20 2000A 690 VAC 3 Pole Air Circuit Breaker — a rugged, high-capacity protection and switching solution built for reliable operation in modern low-voltage power distribution systems. Designed for industrial and commercial facilities, this 3-Pole air circuit breaker safeguards main feeders, switchboards, and critical distribution paths with precision and confidence.

The AT20 is engineered to handle demanding electrical environments. With a 2000 A current rating and a 690 VAC voltage rating, it provides robust protection for large-scale LV networks while maintaining smooth, predictable operation across phases. Its three-pole configuration ensures synchronized tripping across all phases, preserving balance and safeguarding connected equipment from asymmetric faults.

Key benefits

• High-current capability: 2000 A continuous rating handles heavy feeder loads with reliability, reducing nuisance trips during surges.
• Three-pole protection: Ensures simultaneous interruption of all three phases for balanced fault clearance and enhanced safety.
• 690 VAC operation: Suitable for contemporary low-voltage distribution networks with room for future expansion.
• Adjustable trip settings: Tailor protection curves to your load profile, motor starts, and short-circuit scenarios for optimal coordination.
• High interruption capacity: Delivers fast, decisive fault clearance to protect downstream equipment and minimize downtime.
• Industrial-grade reliability: Designed specifically for heavy-duty LV distribution in industrial and commercial facilities, not intended for typical residential use.

Why this AT20 matters in real-world deployments

• Ideal for new installations and upgrades where scalable, dependable protection is essential for main feeders and switchboards.
• Useful in data centers, manufacturing facilities, hospitals, and large commercial complexes where protecting critical power distribution reduces downtime and equipment damage.
• Supports protection scheme coordination by allowing adjustable trip settings that align with upstream and downstream devices.

Practical considerations and best-use tips

• Install as the main incoming feeder breaker or at primary switchboards to enable rapid fault isolation and safeguard downstream circuits.
• Work with a protection engineer to set trip thresholds that balance selective tripping with effective fault clearance.
• Ensure proper enclosure, mounting, and electrical clearances per applicable standards to maintain safety and performance.

Choose the Terasaki AT20 2000A 690 VAC 3-Pole Air Circuit Breaker for a purpose-built solution that delivers dependable protection, precise control, and scalable capacity for demanding low-voltage power distribution environments.