Terasaki AR440SB R 4000A 3 Pole Air Circuit Breaker For Industrial And Commercial Power Distribution

Meet the Terasaki AR440SB-R, a robust 4000A, 3-Pole Air Circuit Breaker engineered for dependable protection and precise control of low-voltage power distribution in industrial and commercial facilities. Built to withstand demanding environments, this unit enables safe switching and reliable fault isolation for critical feeders and switchboards, helping your operation stay up and running.

Core specifications

• Model/Part: AR440SB-R
• Current rating: 4000A
• Poles: 3-Pole
• Breaker type: Air Circuit Breaker

Why this breaker stands out

Designed for endurance in industrial and commercial power systems, the AR440SB-R offers adjustable trip settings that let you fine-tune protection to match your load profile and downstream devices. This enables precise fault detection, reduces nuisance tripping, and delivers rapid isolation when faults occur. The three-pole configuration ensures synchronized protection across all phases, delivering reliable performance for balanced three-phase distributions in switchboards and main feeders.

Ideal applications

• Main incoming feeders in industrial facilities
• Switchboards and panelboards serving critical power circuits
• Low-voltage distribution networks where dependable interruption capacity matters

Practical considerations and setup tips

Install the AR440SB-R within standard low-voltage switchgear, ensuring space and wiring accommodate the panel design. When configuring trip settings, coordinate with upstream and downstream protection to achieve selective coordination across feeders. Regular inspections of connections and mounting integrity help maintain reliable operation in environments with vibration or temperature fluctuations.