Honeywell Two Position Damper Actuator w/ Spring Return and aux. switches (175 lb-in)

MS4120, MS7520, MS8120 Spring Return Direct Coupled Actuators (DCA) are used 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. Models available with adjustable zero and span. Models available with line-voltage internal end switches. Access cover ...