ABB SACE XT4NU3125AYJ000XXX ReliaGear Circuit Breaker

The ABB SACE Tmax XT4NU3125AYJ000XXX ReliaGear circuit breaker is a 125 A, three‑pole molded‑case circuit breaker (MCCB) in the SACE Tmax XT family, rated for up to 600 V AC. This XT4 device is part of ABB’s ReliaGear ecosystem and is designed for use with ReliaGear neXT panelboards and ReliaGear SB switchboards, where it provides primary overcurrent protection for distribution circuits. The XT4 designation places it in the XT4 frame class, enabling 125 A protection in multi‑circuit installations. The model suffix encodes a 3P, 125 A, 600 V configuration that aligns with ReliaGear applications in commercial and light‑industrial facilities. As with other Tmax XT MCCBs, it supports integration with ABB protection schemes within ReliaGear equipment, helping to ensure consistent protection coordination and reliable operation across panelboard and switchboard solutions.