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Honeywell - MS8120A1205 - 175in-lb 24v Two Pos Sprg Retn w/ Aux Sw

Honeywell two position or SPST, 175 lb-in., 20 Nm direct-coupled actuator 24 volt


Honeywell MS8120 175 lb-in. (20Nm) torque, spring return, direct coupled, line voltage actuator accepts two-position (SPST) control for air dampers, air handlers, ventilation flaps, louvers and ball valves.



  • Brushless DC submotor with electronic stall protection for floating/modulating models; brush DC submotor with electronic stall protection for two-position models
  • Self-centering shaft coupling for various shaft sizes
  • For use with two-position, SPST, line- (Series 40) or low- (Series 80) voltage controls
  • For use with floating or switched SPDT (Series 60) controls; for use with proportional current or voltage (Series 70) controls
  • Available with combined floating and modulating control in a single device, adjustable zero and span and with line-voltage internal end switches
  • Access cover facilitates connectivity and metal housing features built-in mechanical end limits
  • Field selectable spring return direction and shaft position indicator and scale
  • UL listed (cUL), CE compliant and plenum rated per UL873


Customer Rating: Not Rated Yet
Quick Order Number: 532
Manufacturer: Honeywell
Part Number: MS8120A1205/U
Weight: 7.00 lbs
Stocked Item*: Yes
Quantity Available*: 0
Price: $370.23

* If an order is placed where the item is a "Non-Stocked Item" or the quantity ordered is more than the quantity available, all items in stock will be shipped and the remainder of the items will be shipped as soon as we get the "backordered" items in.


Product Specifications



Product Specifications

Dimensions (in.)
9.72 in high x 3.94 in wide x 2.95 in deep
Dimensions (mm)
247 mm high x 100 mm wide x 75 mm deep
Mounting bracket, self-centering shaft adapter, 3mm crank
Weight (lb)
6 lb
Weight (kg)
2.72 kg
Aluminum housing, Plenum rated plastic access cover
Integral 1/2 in. NPSM conduit connection.
Direct Coupled
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
UL873, Plenum Rated
Electrical Connections
Enclosed screw terminal strip (22 to 14 AWG)
Operating Humidity Range (% RH)
5 to 95% RH, non-condensing
Supply Voltage
24 Vac ±20%
Power Consumption
Driving-- 40 VA, Holding-- 8 VA
Shipping and Storage Temperature Range (F)
-40 F to +158 F
Shipping and Storage Temperature Range (C)
-40 C to +70 C
Approvals, CE
89/336/ECC, 73/23/EEC
Approvals, Canadian Underwriters Laboratories Inc.
cUL C22.2 No. 24-93
Ambient Temperature Range (F)
-40 F to +140 F
Ambient Temperature Range (C)
-40 C to +60 C
Switch Ratings
250 Vac, 5 A res
Approvals, C-Tick
Environmental, Electrical or Ingress Protection Rating
Internal Auxiliary Switch
Maximum Noise Rating
Driving (dB(A) @ 1m)-- 40; Holding (dB(A) @ 1m)-- 20 (no audible noise)
95 ±3 degrees
Shaft Dimensions (in.)
3/8 to 1.06 in. round or 3/8 to 11/16 in. square
Actuator Type
Valve; Damper
Control Signal
Two position; SPST
Fail Safe Mode
Spring Return
Torque Rating (lb-in.)
175 lb-in.
Torque Rating (Nm)
20 Nm
Spring Return Torque/Force (lb-in., lbf)
175 lb-in.
Spring Return Torque/Force (Nm, N)
20 Nm
Additional Torque Ratings (lb-in.)
Maximum Stall-- 300 lb-in.
Additional Torque Ratings (Nm)
Maximum Stall-- 34 Nm
External Auxiliary Switches Available
Yes, SW2-US
Rotational Stroke Adjustment
Mechanically limited 5 degree increments
Timing, Nominal
Driving @ 60 Hz-- 45 sec
Spring Return Timing
Maximum-- 20 sec
Shaft Adapter Type
Self-centering clamping
Manual operation
Manual crank
Shaft Dimensions (mm)
10 to 27 mm round or 10 to 18 mm square
Spring Return Direction
By orientation


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