Manual Motor Protectors (MMPs) features a pushbutton or rotary ON/OFF manual disconnect, Class 10 adjustable bimetallic overload relay and fixed magnetic short circuit trip capability in one compact unit. The Frame B size (45 mm) for motors has FLA ratings up to 32A. The XTPB and XTPR MMPs are UL Listed under UL 508 as Manual Motor Protectors. They provide an economical solution for applications requiring simple manual starting and stopping of motors. When used as an MMP, they are typically installed in an enclosure. Many enclosures are offered as accessories for the MMPs. Separate short-circuit protective devices, such as circuit breakers or fuses, are wired ahead of the MMPs. The short-circuit protective device should be sized per the NEC code and should not exceed 400% of the maximum FLA dial setting of the MMP. A Group Motor Installation can be defined as more than one motor circuit protected by a single set of fuses or circuit breaker on a motor branch circuit. This eliminates the need for individual fuses or circuit breakers for each motor circuit. Substantial component cost savings, panel space savings and reduced wiring installation time can be achieved in Group Motor Installations. The MMPs are tested and listed for group installation. If remote operation is required, a magnetic contactor can be wired in series with the MMP. Manual Motor Protectors are selected based on the overload current range required for a given motor. This current range is determined from the motor Full Load Ampere rating and Motor Service Factor usually found on the motor nameplate. For motors with service factors less than 1.15, multiply the motor FLA by 0.90 to select appropriate MMP. Example: For motor having FLA of 6.4 A and service factor of 1.0 (6.4 A x 0.90 = 5.76 A), select Model Number: XTPB6P3BC1
