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Honeywell BMS NA

MS81 Spring Return Direct Coupled Actuators

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.

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
Others
Name
Description
File Size
Date
Size
Replacement Guide
1.14 MB
8/19/2021
PDF 1.14 MB
Cross Reference
214.89 KB
8/19/2021
PDF 214.89 KB
Installation Instructions
1.78 MB
8/19/2021
PDF 1.78 MB
INSTALLATION INSTRUCTIONS
278.99 KB
8/19/2021
PDF 278.99 KB
Installation Instructions
282.93 KB
8/19/2021
PDF 282.93 KB
Wiring
525.49 KB
8/19/2021
PDF 525.49 KB
Installation Instructions
141.52 KB
8/19/2021
PDF 141.52 KB
Installation Instructions
262.97 KB
8/19/2021
PDF 262.97 KB
Installation Instructions
125.56 KB
8/19/2021
PDF 125.56 KB
Installation Instructions
410.04 KB
8/19/2021
PDF 410.04 KB
Product Data
1.77 MB
8/19/2021
PDF 1.77 MB
Product Data
171.74 KB
8/19/2021
PDF 171.74 KB
Specification Data
298.43 KB
8/19/2021
PDF 298.43 KB
Specification Data
242.83 KB
8/19/2021
PDF 242.83 KB
Specification Data
313.9 KB
8/19/2021
PDF 313.9 KB
Specification Data
306.55 KB
8/19/2021
PDF 306.55 KB
Specification Data
279.29 KB
8/19/2021
PDF 279.29 KB
Name
Description
File Size
Date
Size
Replacement Guide
1.14 MB
8/19/2021
PDF 1.14 MB
Cross Reference
214.89 KB
8/19/2021
PDF 214.89 KB
Installation Instructions
1.78 MB
8/19/2021
PDF 1.78 MB
INSTALLATION INSTRUCTIONS
278.99 KB
8/19/2021
PDF 278.99 KB
Installation Instructions
282.93 KB
8/19/2021
PDF 282.93 KB
Wiring
525.49 KB
8/19/2021
PDF 525.49 KB
Installation Instructions
141.52 KB
8/19/2021
PDF 141.52 KB
Installation Instructions
262.97 KB
8/19/2021
PDF 262.97 KB
Installation Instructions
125.56 KB
8/19/2021
PDF 125.56 KB
Installation Instructions
410.04 KB
8/19/2021
PDF 410.04 KB
Product Data
1.77 MB
8/19/2021
PDF 1.77 MB
Product Data
171.74 KB
8/19/2021
PDF 171.74 KB
Specification Data
298.43 KB
8/19/2021
PDF 298.43 KB
Specification Data
242.83 KB
8/19/2021
PDF 242.83 KB
Specification Data
313.9 KB
8/19/2021
PDF 313.9 KB
Specification Data
306.55 KB
8/19/2021
PDF 306.55 KB
Specification Data
279.29 KB
8/19/2021
PDF 279.29 KB
Image
SKU
Description
alt
MS8103A1030/U
Direct Coupled Actuator, Spring Return, 27 lb-in, 3 Nm, 24 Vac, 2-position (SPST)
alt
MS8120A1007/U
Direct Coupled Actuator, Spring Return, 175 lb-in, 20 Nm,24 Vac, 2-position (SPST)
alt
MS8105A1030/U
Direct Coupled Actuator, Spring Return, 44 lb-in, 5 Nm, 24 Vac, 2-position (SPST)
alt
MS8105A1138/U
Direct Coupled Actuator, Spring Return, 44 lb-in, 5 Nm, 24 Vac, 2-position (SPST), 1x Aux Switch, Special for Kele
alt
MS8120A1205/U
Direct Coupled Actuator, Spring Return, 175 lb-in, 20 Nm,24 Vac, 2-position (SPST), 2x Aux Switch
alt
MS8120W1007/U
Direct Coupled Actuator, Spring Return, 175 lb-in, 20 Nm,24 Vac, 2-position (SPST), with 3 ft. cable
alt
MS8105A1038/U
Direct Coupled Actuator, Spring Return, 44 lb-in, 5 Nm, 24 Vac, 2-position (SPST), Special for Kele
alt
MS8120W1205/U
Direct Coupled Actuator, Spring Return, 175 lb-in, 20 Nm,24 Vac, 2-position (SPST), with 3 ft. cable, 2x Aux Switch
alt
MS8110A1008/U
Direct Coupled Actuator, Spring Return, 88 lb-in, 10 Nm, 24 Vac, 2-position (SPST)
alt
MS8103A1130/U
Direct Coupled Actuator, Spring Return, 27 lb-in, 3 Nm, 24 Vac, 2-position (SPST), 1x Aux Switc