Ensure reliable operation of your CR101 starters with the ABB CR123H224A Overload Relay Heater. Designed as a component for NEMA contactors and starter accessories, this heater provides essential protection for your motor control systems. Trust ABB's quality for your industrial automation needs..The ABB CR123H224A is an overload relay heater designed for use with CR101 starters. It is part of ABB's NEMA Contactor & Starter Accessories product line. The unit has a package level width of 1 inch, a depth/length of 1.75 inches, and a height of 0.5 inches, with a gross weight of 0.025 lb.