The ALLEN BRADLEY 150-C251NBR is a solid state soft starter and smart motor controller (SMC-3) with 251 AMP capacity. It features an open enclosure design, operates at 200-460 VAC input line voltage for 3-phase systems, and supports both 50/60 Hz frequencies. The unit utilizes 24 VAC/DC control voltage. This product comes with Radwell's 2-year warranty (factory warranty not applicable).