Siemens EQ8681 100 Amp 2 Pole 120 240 Volt Main Circuit Breaker

Siemens EQ8681 100 Amp 2-Pole Main Breaker Kit (MBK100A) is a bolt-on, thermal-magnetic main circuit breaker designed for Siemens EQ load centers that accept the EQ8681 main breaker. This 2-pole device provides a 100 A main disconnect for 120/240 V AC service and carries a UL interrupting rating up to 22 kA at 240 V, enabling robust short-circuit protection for typical residential and light-commercial distribution panels. The MBK100A is specified for use with EQIII load centers and other Siemens panels that list EQ8681, and is commonly used to supply the panel with a centralized main protection point by disconnecting both hot legs simultaneously. Installation employs a bolt-on mounting method and is part of Siemens' EQ main-breaker options; the kit is cataloged as MBK100A and corresponds with the EQ8681 main-breaker type, ensuring compatibility with Siemens equipment that requires this specific main breaker configuration. Users should verify panel compatibility—panels that accept EQ8681 main breakers can accommodate this 100 A main, making it a standard solution for main-disconnect protection within the Siemens EQ family.