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Mounting:
3/8 in. (10 mm) to 1/2 in. (13 mm) square or round damper
shafts. Actuator can be mounted with shaft in any position.
Secure hub to shaft with:
ML8125, ML4125A,B: Four 1/4-28 UNF set screws. Use
1/8 in. Allen wrench to tighten set screws.
ML8135, ML4135: Two 1/4-28 UNF set screws. Use 1/8 in.
Allen wrench to tighten set screws.
ML4125C,D: Four 3 mm set screws. Use 3 mm Allen wrench
to tighten set screws.
IMPORTANT
Honeywell does not recommend using linkages with
these actuators because side-loading of the output
hub reduces actuator life.
Minimum Damper Shaft Length: 1-3/4 in. (45 mm).
Timing:
Drive Open:
ML4125, ML8125: 25 to 40 seconds (load dependant).
ML4135, ML8135: 20 to 25 seconds (load dependant).
Spring Close:
ML4125, ML8125: 20 to 25 seconds.
ML4135, ML8135: 15 seconds.
Design Life (at Rated Voltage):
ML4125, ML8125: 80,000 full-stroke cycles.
ML4135, ML8135: 60,000 full-stroke cycles.
Environmental Protection Ratings: See Table 2.
Table 2. Environmental Ratings.
All Devices
NEMA1
Approvals: See Table 3.
Accessories:
201391 Shaft Adapter for 3/8 in. (10 mm) shafts.
205649 Mounting Bracket (included with the actuator).
32003532-001 Adjustable Switch Package, two 10A
externally-mounted fully-adjustable switches.
ML4125, ML4135, ML8125, ML8135 FAST-ACTING, TWO-POSITION ACTUATORS
ML4125C,D, ML8125, ML8135
IP54
ML4125
A,B
UL/cUL
X
UL873
X
Plenum Rating,
File No. E4436
CE
C-TICK
2 (51)
1 (25)
2 (51)
4 (102)
5 1/8 (129)
Fig. 1. ML4125/4135, ML8125/8135
dimensiona drawing in in. (mm).
3
Table 3. Approvals.
C,D
ML4135 ML8125 ML8135
X
X
X
X
X
X
X
X
X
X
5/8
(17)
1
6 3/8
(161)
7 1/2
(192)
3 5/16 (84)
7/8 (22)
ML4135/ML8135 HAVE SHORTER
1
HUB WITH TWO SET SCREWS.
ML4125/ML8125 HAVE LONGER
HUB WITH FOUR SET SCREWS.
X
X
X
1/16 (2)
M17538
63-2567—3
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