CR123C, CR123F Motor Starter Heaters. Maximum Motor Full-Load Amper: 24.8. All CR123C and 123F heaters are packaged three to a carton. Items of these heaters, being ordered for either customer’s stock or any other purpose, are to be specified in multiples of three (such as 3, 6, 9, 12, 15, etc.). Minimum order quantity is three.