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S03 Series (MS4103; MS7403; MS7503; MS8103)
MS4103, MS7403, MS7503,
MS8103 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 ........................................ 27 lb-in. (3 Nm)
External Auxiliary Switches Available ..No
Electrical Connections .........................Enclosed screw terminal strip
(22 to 14 AWG)
Environmental Rating ...........................NEMA2
Frequency ............................................ 50 Hz; 60 Hz
Mounting ..............................................Direct Coupled
Maximum Noise Rating,
Holding (dBA @ 1m) ............................20 (no audible noise)
Maximum Noise Rating,
Driving (dBA @ 1m) ..............................50
Timing, Nominal Driving at 60 Hz ........45 sec. or 90 sec.
Power Consumption, Driving ............... 6.5 VA, 7 VA, or 10 VA
Rotation to Open ..................................By switch
Rotational Stroke Adjustment ............... Mechanically limited 5 degree
increments
Compatible Damper Shafts .................. 3/8 to 5/8 round or 1/4 to 1/2
square
(9 to 16 round or 6 to 13
square)
Shaft Adapter Type ..............................Self-centering clamping
Materials ............................................... Plenum rated plastic housing
Ingress Protection Rating .....................IP54
Operating Humidity Range (% RH) ......5 to 95% RH, non-condensing
Ambient Temperature Range ............... -40 F to 150 F (-40 C to 65 C)
-22 F to 150 F (-30 C to 65 C)
Two-position models only
Temperature Ratings (Shipping) .......... -40 F to 150F (-40 C to 65 C)
Storage Temperature Range ................ -40 F to 150F (-40 C to 65 C)
Weight .................................................. 3.5 lb (1.6 kg)
Includes ...............................................Mounting bracket, self-
centering shaft adapter
APPROVALS
CE ........................................................2006/95/EC
(Low Voltage Directive )
EMC 2004/108/EC
C-Tick ................................................... N314
International Electrotechnical Commission IEC 60730-1 and Part 2—14
Underwriters Laboratories, Inc. ........... UL 873
UL1097 for Double Insulation
FEATURES
• Volume control dampers, mounted directly to the drive shaft
or remotely (with the use of accessory hardware).
• Quarter-turn rotary valves, such as ball or butterfly valves
mounted directly to the drive shaft.
• Linear stroke globe or cage valves mounted with linkages to
provide linear actuation.
DIMENSIONS DIAGRAM
M27712A
3-55/64 (98)
6-61/64
(177)
1-1/8
(29)
5-27/32
(148)
1-9/16
(40)
3-5/32 (80)
4-9/16
(116)
1-15/16
(49)
1-1/16
(27)
2-1/64
(55)
47/64
(19)
2-27/64 (61)
Spring Return Direct Coupled Actuator
S03 Series (MS4103; MS7403; MS7503; MS8103)