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ML4125; ML8125
The ML8125 Fast-Acting, Two-
Position Actuators are spring return
direct coupled actuators (DCA)
with an integral junction box for
on/off damper control.
SPECIFICATIONS
Actuator Type .......................................Damper
Rotational Stroke .................................. 95 ±3 degrees
Fail Safe Mode .....................................Spring Return
Rated Torque ........................................100 lb-in. (11.3 Nm)
External Auxiliary Switches Available ..Yes, 32003532-005
Electrical Connections .........................Two color-coded leads
Electrical Connection Length ............... 16 in. (406 mm)
Environmental Rating ........................... NEMA1
Frequency ............................................ 60 Hz
Mounting ..............................................Direct Coupled
Maximum Noise Rating,
Holding (dBA @ 1m) ............................20 (no audible noise)
Maximum Noise Rating,
Driving (dBA @ 1m) ..............................65
Timing, Nominal Driving at 60 Hz ........20 sec
Power Consumption, Driving ............... 0.18 A/18 W or 18 VA
Compatible Damper Shafts .................. 3/8 to 1/2 in. square or round
(10 to 13 square/round)
Shaft Adapter Type ..............................Aluminum Hub, two set screws
Supply Voltage ..................................... 120 Vac +10%, -15%
Materials ............................................... Aluminum housing
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 .................................................. 6 lb (2.72 kg)
Includes ...............................................Ground Screw
Comments ............................................Integral junction box with three
7/8 in. conduit openings
(fittings not included)
APPROVALS
Underwriters Laboratories, Inc. ........... UL873, Plenum Rated
Canadian Underwriters
Laboratories, Inc. ................................. cUL C22.2 No. 24-93
FEATURES
• Integral spring return.
• -40 C to 130 F (-40 C to 54 C) operating temperature range.
• No audible noise during holding.
• Electronic circuitry provides efficient operation while
eliminating the need for limit switches.
• Ninety-five degree angle of rotation.
• Die-cast aluminum housing. Housing design allows flush
mounting to damper.
• Integral junction box with three conduit openings eliminates
need for separate wiring box.
• Direct mounting to 3/8 or 1/2 in. round or square shaft.
• Not intended for smoke control systems.
DIMENSIONS DIAGRAMS
2 (51)
1 (25)
5/8
(17)
6 3/8
(161)
7 1/2
(192)
4 (102)
7/8 (22)
5 1/8 (129)
2 (51) 3 5/16 (84)
1/16 (2)
M17538
ML4135/ML8135 HAVE SHORTER
HUB WITH TWO SET SCREWS.
ML4125/ML8125 HAVE LONGER
HUB WITH FOUR SET SCREWS.
1
1
Spring Return Direct Coupled Actuator
ML4125; ML8125