About this product

Lauritz Knudsen Type RTO thermal overload relays are bimetallic motor-protection relays suitable for MO series contactors. RTO 1, RTO 2 and RTO 3 mount directly on MO 9-45, MO 50-70 and MO 80-110 contactors respectively and are directly operated; RTO 4 is CT operated and separately mounted for larger motor ratings. Features include ambient-temperature compensation up to 55 deg C, built-in single-phasing protection, manual and auto reset, front access to START and STOP/RESET buttons, and sealable OFF condition. Conforms to IS/IEC 60947-4-1 and IEC 60947-4-1.