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S20 Series (MS4120; MS7520; MS8120)
MS4120, MS7520, MS8120 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.
SPECIFICATIONS
Actuator Type .......................................Damper, Valve
Rotational Stroke ..................................95 ±3 degrees
Fail Safe Mode .....................................Spring Return
Rated Torque ........................................175 lb-in. (20 Nm)
External Auxiliary Switches Available ..Yes, SW2-US
Electrical Connections .........................Enclosed screw terminal strip
(22 to 14 AWG)
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) ..............................40
Timing, Nominal Driving at 60 Hz .........45 sec. or 90 sec.
Power Consumption, Driving ................16 VA, 40 VA, or 60 VA
Rotational Stroke Adjustment ...............Mechanically limited 5 degree
increments
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 .....................................100 to 250 Vac
Materials ...............................................Aluminum housing, Plenum
rated plastic access cover
Operating Humidity Range (% RH) ......5 to 95% RH, non-condensing
Ambient Temperature Range ...............-40 F to 140 F (-40 C to 60 C)
Storage Temperature Range ................-40 F to 158 F (-40 C to 70 C)
Weight ..................................................6 lb (2.72 kg)
Includes ................................................Mounting bracket, self-
centering shaft adapter, 3mm
crank
Comments ............................................Integral 1/2 in. NPSM conduit
connection.
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
• Brushless DC sub-motor with electronic stall protection for
floating/modulating models.
• 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.
• 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.
DIMENSIONS DIAGRAMS
9-3/4
(247)
1-9/16
(40)
6-1/8
(156)
1-9/16
(40)
1-9/16
(40)
3-15/16 (100)
2-15/16 (75)
1/4 (6)
M20952
Spring Return Direct Coupled Actuator
S20 Series (MS4120; MS7520; MS8120)
SUBMITTAL SHEETS