ABB XT1NU3125AFF000XXX Molded Case Circuit Breaker

ABB SACE Tmax XT1NU3125AFF000XXX is a 3‑pole molded‑case circuit breaker in the XT1N family, engineered for robust protection in commercial and industrial power distribution. The unit uses a 125 A frame and is rated for up to 600 VAC (600Y/347/690 VAC configurations) with an 18 kA short‑circuit breaking capacity at 600 V, making it suitable for systems with moderate to high fault currents. It employs a thermal‑magnetic trip unit (TMF) with a fixed trip characteristic, delivering reliable overcurrent protection without field adjustment. Terminations are configured for front line and load side connections, simplifying panel mounting and wiring in standard enclosures. The device operates over a wide temperature range from −25°C to 70°C (−13°F to 158°F) and measures roughly 5.12 inches high by 3 inches wide by 2.75 inches deep, aiding installation in compact spaces. This ABB MCCB carries UL and CSA certifications, aligning with common North American and international electrical standards. Typical applications include motor feeders, distribution panels, and branch circuits where dependable short‑circuit protection and consistent thermal‑magnetic performance are essential for equipment safety and reliability.