MBKQR1200A

The MBKQR1200A is a -pole main breaker mounting kit from Siemens, designed to adapt QR-frame molded case circuit breakers into compatible Siemens power distribution panels and load centers. Rated for at , this main breaker conversion kit allows contractors and facilities managers to establish heavy-duty main circuit protection for high-capacity branch and feeder circuits in commercial and light industrial applications. Electrically, the MBKQR1200A provides the busing extensions and phase connections necessary to securely interface a QR main breaker with the panelboard’s interior bus structure. It maintains low-resistance electrical contact across all poles, ensuring efficient current transfer and preserving the breaker's ability to clear overloads and short circuits without introducing excessive voltage drop or heating at the termination points. Mechanically, the MBKQR1200A includes all specialized mounting brackets, barrier insulation, and hardware required to complete a precise, code-compliant main breaker installation. Its rigid physical framework holds the circuit breaker securely in position, protecting the interior assembly against mechanical stress and magnetic forces during fault conditions. UL listed for use with compatible Siemens distribution equipment, the MBKQR1200A is a reliable choice for system retrofits, main service additions, and new panelboard builds. Purchase the MBKQR1200A at Electrical.com, your reliable partner for industrial and commercial electrical products. Our selection includes trusted circuit breakers from manufacturers like Siemens, Eaton, Cutler-Hammer, and Schneider Electric, backed by a knowledgeable sales team ready to assist with technical questions, product selection, and support.