Honeywell MS4120, MS7520, MS8120 Catalog Page
Direct Coupled Damper Actuator—Spring Return
S20 Series: MS4120; MS7520; MS8120
Spring Return Direct Coupled Actuator, 175 lb-in
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.
• Brushless DC submotor with electronic stall protection for floating/
modulating models.
• Brush DC submotor 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.
• Models available with three-foot, 18 AWG color-coded cable.
• 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.
Commercial
Actuator Type: Damper; Valve
Rotational Stroke: 95 ±3 degrees
Fail Safe Mode: Spring Return
Torque Rating: 175 lb-in. (20 Nm)
Spring Return Torque: 175 lb-in. (20 Nm)
Spring Return Direction: By orientation
Dimensions, Approximate: 9.72 in high x 3.94 in wide x 2.95 in deep
(247 mm high x 100 mm wide x 75 mm deep)
External Auxiliary Switches Available: Ye s , S W2 -U S
Electrical Connections: Enclosed screw terminal strip (22 to 14 AWG)
Environmental Rating: NEMA2
Frequency: 50 Hz; 60 Hz
Manual operation: Manual crank
Mounting: Direct Coupled
Maximum Noise Rating, Holding (dBA @ 1m): 20 (no aud ble noise)
Maximum Noise Rating, Driving (dBA @ 1m): 40
Rotational Stroke Adjustment: Mechanically limited 5 degree
increments
Compatible Damper Shafts: 3/8 to 1.06 in. round or 3/8 to 11/16 in.
square (10 to 27 mm round or 10 to 18 mm 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: 7.4 lb (3.36 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
Components
70-6910 385
Direct Coupled Damper Actuator—Spring Return
Product Number
MS4120A1001/U
MS4120A1209/U
MS7520A2007/U
MS7520A2205/U
MS7520H2208/U
MS7520W2007/U
MS7520W2205/U
MS8120A1007/U
MS8120A1205/U
MS8120W1007/U
MS8120W1205/U
Control
Signal
Tw o
position;
SPST
(0)2-10 Vdc
(4-20 mA w/
500 ohm
resistor);
On/Off;
SPDT;
Floating
(0)2-10 Vdc
(4-20 mA w/
500 ohm
resistor);
Floating
Tw o
position;
SPST
Timing (seconds)
Feedback
— 45 sec 20 sec — 60 VA 13 VA 100 to
— 45 sec 20 sec 250 Vac,
2-10
Vdc
(max.
output:
±1.0
mA)
— 45 sec 20 sec — 40 VA 8 VA 24 Vac
— 45 sec 20 sec 250 Vac,
— 45 sec 20 sec — 40 VA 8 VA 24 Vac
— 45 sec 20 sec 250 Vac,
Nominal
Driving
@ 60 Hz
90 sec 20 sec — 16 VA 5 VA 24 Vac
90 sec 20 sec 250 Vac,
90 sec 20 sec 250 Vac,
90 sec 20 sec — 16 VA 5 VA 24 Vac
90 sec 20 sec 250 Vac,
Maximum
Spring
Return
(sec) Driving Holding (m)
Switch
Ratings
5 A res
5 A res
5 A res
5 A res
5 A res
5 A res
Power
Consumption
Supply
Vo lt ag e
250 Vac
60 VA 13 VA 100 to
16 VA 5 VA 24 Vac
16 VA 5 VA 24 Vac
16 VA 5 VA 24 Vac
40 VA 8 VA 24 Vac
40 VA 8 VA 24 Vac
250 Vac
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
Electrical
Connection
Length
Input
Impe-
Cable
dance
Entry
— — Enclosed
—— ——2
Min.
———0
95
kOhm
Min.
———2
95
kOhm
Min.
———2
95
kOhm
Min.
Threaded
95
conduit
kOhm
connecto
r
Min.
Threaded
95
conduit
kOhm
connecto
r
— — Enclosed
—— ——2
— Threaded
conduit
connecto
r
— Threaded
conduit
connecto
r
Electrical
Connections
screw terminal
strip (22 to 14
AWG)
18 AWG colorcoded cable
screw terminal
strip (22 to 14
AWG)
18 AWG colorcoded cable
——0
0.9 m 36 in. 0
0.9 m 36 in. 2
——0
0.9 m 36 in. 0
0.9 m 36 in. 2
(inch
)
Number
of
Internal
Auxiliary
Switch
386 customer.honeywell.com 70-6910
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