Two Position Damper Actuator w/ Spring Return (44 lb-in)

The MS4105 is a 44 lb-in (5Nm), spring return direct-coupled, line voltage actuator that accepts two position (SPST) control for use within heating, ventilating, and air-conditioning (HVAC) systems. They can drive a variety of quarter-turn, final control elements requiring spring return fail-safe operation. Features: Brushless DC submotor with electronic stall protection for floating/modulating models. Brush DC submotor with electronic stall protection for 2-position models. Self-centering shaft adapter (shaft coupling) for wide range of shaft sizes. Models available for use with two-position, single pole single throw (spst), line- (Series 40) or low- (Series 80) voltage controls. Models available for use with floating or switched single-pole, double-throw (spdt) (Series 60) controls. Models available for use with proportional current or voltage (Series 70) controls. Models available with combined floating/modulating control in a single device. Access cover to facilitate connectivity. Metal housing with built-in mechanical end limits. Spring return direction field-selectable. Shaft position indicator and scale. Manual winding capability with locking function. UL (cUL) listed and CE compliant. All models are plenum-rated per UL873.