Overview

Honeywell MS4120A1001 Spring Return Actuator. The MS4120A is a 175 lb-in (20Nm), 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. 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.

Specifications

More Information
Manufacturer Honeywell
Product Type Replacement Part

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