Direct Coupled Actuator, SR, 2 Position, SPST, 24V, 175 lb-in, 20 Nm, w/ 2 Internal Aux. Switches

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.

Product 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 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.

Product Specifications

• Actuator Type: Damper, Valve
• Application Type: HVAC
• Fail Safe Mode: Spring Return
• Control Signal: SPST, 2 Position
• Supply Voltage: 24 Vac +/- 20%
• Number of Internal Auxiliary Switches: 2
• Switch Ratings: 250 Vac, 5 A res (3 A ind)
• Shaft Adapter Type: Self Centering clamping
• Manual Operation: Manual Crank
• Mounting: Direct Coupled
• Frequency: 60 Hz, 50 Hz
• Rotational Stroke: 95 ¬+/- 3 degrees
• Rotational Stroke Adjustment: Mechanically limited 5 degree increments
• Spring Return Direction: By orientation
• Timing, Maximum Spring Return (sec): 20 sec
• Timing, Nominal Driving @ 60 Hz (sec): 45 Sec
• Spring Return Direction: By orientation
• Dimensions (in.): 9.72 in high x 3.94 in wide x 2.95 in deep
• Compatible Damper Shafts (in.): 3/8 to 1.06 in. round or 3/8 to 11/16 in. square
• Temperature Range, Ambient (F): -40 F to 140 F
• Operating Humidity Range (% RH): 5 to 95% RH, non-condensing
• Includes: Mounting bracket, self-centering shaft adapter, 3mm crank