Eaton NSB FAZ-D3 1-NA-SP Miniature Circuit Breaker

Eaton NSB FAZ-D3 1P 3A 277V Miniature Circuit Breaker is a single-pole protective device designed for overcurrent interruption on a 277‑volt circuit. With a 3‑ampere rating and a 50/60 Hz operating frequency, this FAZ-D3 MCB is suited for electrical installations that require reliable, compact protection for a single energized conductor. As part of Eaton's NSB FAZ series, it is intended for use in panelboards or distribution blocks that accept 1P protection blocks. The 277 V rating aligns with applications where equipment and lighting runs are supplied from a 277V distribution system, enabling the breaker to quickly interrupt fault currents and help prevent damage to conductors and connected devices. By selecting a 1P 3A device, installers specify protection on a single hot line while preserving the rest of the circuit’s continuity, aligning with standard single-pole protection practices in appropriate voltage environments.