PKZ2/ZMR-4/S-SP Eaton Motor Protective Circuit Breaker

The PKZ2/ZMR-4/S-SP is a 4A, 3-pole motor protective circuit breaker classified as a manual motor starter. It combines short-circuit and overload protection in one unit, comprising the PKZ2/S-SP base module with integrated contactor, ZMR-4-PKZ2 overload relay (thermal setting range 2.4–4 A), and C-PKZ2 DIN rail mounting adapter. Magnetic trip occurs between 35 A and 55 A. It supports motors up to 1 HP at 230 V and 2 HP at 460 V. Certified to UL 508 and CSA 22.2 as a Type E combination motor controller, it requires no additional overcurrent protection. Features include a plug-in trip module, phase-loss differential trip, built-in auxiliary contacts, and compatibility with accessories.