The ABB CR123H291A is an overload relay heater designed to provide thermal overload protection for CR101H and Y models. This heater unit is packaged as a single piece for convenience. Ensure reliable operation of your motor control systems with this essential component from ABB..The ABB CR123H291A is an overload relay heater for CR101H and Y models, offering thermal overload protection. It has a maximum motor full-load ampere rating of 2.53. The product is packaged as a single unit.