Enhance the reliability of your CR101H starter with the ABB CR123H575A Overload Relay Heater. Designed as a crucial accessory for NEMA contactors and starters, this heater unit provides essential thermal overload protection, helping to prevent motor damage and ensure continuous operation. It is packaged as a single unit for convenient installation..The ABB CR123H575A is an overload relay heater unit designed for use with CR101H starters. It provides thermal overload protection for motors. The unit has a maximum motor full-load ampere rating of 5.00. Its dimensions are 1 inch in width, 1.75 inches in depth/length, and 0.5 inches in height. The product net weight is 0.025 lb.