The 518633 Motor 3-Way Valve Actuator (EMV 110-M 89i0, IP40, RED)

is compatible with several Nibe & other manufactures, including the F1126, F1145, F1155 (6kW & 16kW), F1226, F1245, F1255 (6kW & 16kW), F730, F750, and VVM series (310, 320, 325, 500).

It appears to be a compact rotary actuator with a brass diverter valve, designed for closed heating systems such as geothermal and air-to-water heat pumps. The actuator features quick assembly via a clip system, Molex electrical connection, and built-in relay module for two-wire control.