MSRR Spring Release by Eaton, Cutler Hammer or Westinghouse EATON, SPRING RELEASE FIELD OPTION KIT, LV AIR CIRCUIT BREAKER ACCESSORY, 208-240 VAC 220-250 VDC CAT # MSRR New Surplus Inventory Code: T Make an Offer Send to a Friend WHSE: MDS1B3 Return To Circuit Breakers