Siemens MT0350A Control Power Transformer. Siemens Control Power Transformer, Class MT, 240 x 480, 230 x 460, 220 x 440 VAC Primary, 110/115/120 VAC Secondary, 350 VA Power, 50/60 Hz Frequency, 1 ph, Screw Connection, Surface Mounting, Open Enclosure, -4 to 104 deg F, 4.47 in H x 4.5 in W x 5.6 in D Dimensions. Additional Description: SIEM-MT0350A CONTROL TRANSFORMER,350VA,240/480-120V, TRANSFORMER,350VA,240/480-120V. Catalog Description: Control Power Transformer, 350va, PRI 240x480 230x460 220 440v, SEC 120/115/110v, Domestic.