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MS4120F; MS4620F; MS8120F
Spring return direct coupled
actuators (DCA) for on/off damper
control with an integral junction
box. The actuator accepts an on/off
signal from a single-pole, single-
throw (SPST) controller. They are
designed to operate reliably in
smoke control systems requiring
Underwriter's Laboratories Inc.
UL555S ratings up to 350 F.
SPECIFICATIONS
Actuator Type .......................................Damper
Rotational Stroke .................................. 95 ±3 degrees
Fail Safe Mode .....................................Spring Return
Rated Torque ........................................175 lb-in. (20 Nm)
Maximum Stall Torque ..........................425 lb-in. (48 Nm)
Minimum Driving Torque at 350 F ........ 175 lb-in. (20 Nm)
Spring Return Torque ........................... 175 lb-in. (20 Nm)
External Auxiliary Switches Available ..No
Electrical Connections ......................... Teflon-jacketed cable
Electrical Connection Length ............... 40 in. (1 m)
Environmental Rating ........................... NEMA2
Frequency ............................................ 60 Hz
Manual operation .................................Manual crank
Mounting ..............................................Direct Coupled
Maximum Noise Rating,
Holding (dBA @ 1m) ............................20 (no audible noise)
Maximum Noise Rating,
Driving (dBA @ 1m) ..............................70
Compatible Damper Shafts .................. 3/8 to 1.06 round or 3/8 to
11/16 square (10 to 27 round
or 10 to 18 square)
Shaft Adapter Type ..............................Self-centering clamping
Supply Voltage ..................................... 120 Vac ±10%
Materials ............................................... Aluminum housing
Ingress Protection Rating .....................IP54
Operating Humidity Range (% RH) ......5 to 95% RH, non-condensing
Ambient Temperature Range ............... -40 F to 130 F (-40 C to 55 C)
Storage Temperature Range ................ -40 F to 140 F (-40 C to 60) C
Weight .................................................. 8 lb (3.63 kg)
Includes ...............................................Self-centering shaft adapter,
3mm crank
Comments ............................................ Two integral 3/8 in. flexible
conduit connections
APPROVALS
CE ........................................................89/336/ECC, 73/23/EEC
C-Tick ................................................... N314
Underwriters Laboratories, Inc. ........... UL873, Plenum Rated
Canadian Underwriters Laboratories, Inc. cUL C22.2 No. 24-93
FEATURES
• Brush DC sub-motor 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
• 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
DIMENSIONS DIAGRAM
10-11/16
(271)
1-9/16
(40)
8-5/8
(220)
2 (50)
3-15/16 (100)
2-15/16 (75)1/4 (6)
M20051
Fire And Smoke Actuator
MS4120F; MS4620F; MS8120F