Siemens SpeedFax™ MBK150 Type SL Transfer Switch Main Circuit Breaker, 120/240 VAC, 50 A, 22 kA Interrupt, 1 Poles, Thermal Magnetic Trip

Siemens offers one of the most comprehensive lines of Molded Case Circuit Breakers (3 to 2000A) on the market today. Geared for Industrial, Commercial and OEM applications, when it comes to ready availability, easy installation, and quality, you need a manufacturer you can trust