Description
Fire and smoke actuator, spring return, 175 lb-in, 20 Nm, 24 Vac, 2-position (SPST), 2x auxiliary switch.
MS81 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 & Benefits:
- 30 lb-in or 80 lb-in minimum driving torque at 350F (176C)
- Reversible mounting facilitates use in either clockwise (cw) or counterclockwise (ccw) spring rotation
- Integral spring return ensures level of return torque
- Fifteen-second spring return timing
- No special cycling required during long-term holding. (See Operation section.)
- No audible noise during holding
- Patent pending design eliminates need for limit switches to reduce power consumption
- Models available for 24, 120, and 230V AC
- Ninety-five degree angle of rotation
- Actuator holds rated torque at reduced power level
- Die-cast aluminum housing
- Housing design allows flush mounting to damper
- Designed to operate reliably in smoke control systems requiring Underwriter’s Laboratories Inc. UL555S ratings up to 350F
- Models available with SPST position-indicating switches (7°, 85° stroke)
Certifications:
- UL873
- IEC 60730-1 and Part 2–14
- UL1097 for Double Insulation
- CE Certification Low Voltage Directive 2006/95/EC
- CE EMC 2004/108/EC
- C-Tick N314
