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Edmonton 780-448-9498

Calgary 403-770-5625


3/4 HP Commercial / Industrial
Heavy Duty Trolley Overhead Door Opener
w/ Solenoid Brake

Standard Features

The OTBH 3/4 HP garage door opener shows its ability to deal with heavy loads and extreme climates very well in Edmonton.


60Hz high starting torque, continuous-duty, single phase capacitor start or 3 phase motor, open drip proof, protected againsr overload. Also available with 50Hz 220V 1 phase and 380V 3 phase motor.


First step in reduction 5L/B V-belt drive, additional step by #41 chain and sprockets. Input shaft is 5/8", supported by precision ball bearings. Output shaft is 1" supported by ball bearings. Output shaft speed: 120 rpm for a door travel of 12"/s.


Friction type, positioned on input shaft, easily adjustable from outside.

Drive & Trolley Assembly

#48 (410) full roller chain drive on 1/2HP and 341 full roller chain drive on 3/4, 1HP. Dual, 12 gauge, pre-drilled galvanized tracks provided for doors up to 12' in height standard. Additional track lengths are available (max door height acceptable for the operator limit system is 30'). Track spacers 3/4" steel shaft. Trolley made of cast aluminum alloy with chain tension adjustment device.


Electrically activated drum-band type solenoid brake.

Manual Operation

Quick release disconnect arm for manual push-up operation.

Electrical Enclosure

All electrical components are in a Nema 1 enclosure. Hinged electrical enclosure cover.

Limit System

Rotary-type oil-imregnated steel cams, commercial grade switches. Limit shaft is supported by self-lubricating bronze bushings for increased precision. Remains in time when there is a manual operation or after the motor has been removed.

Accu-cam Feature

Precise and quick one-handed adjustment of the limits.

Corrosion Protection

Frame and control enclosure protected by baked on, long lasting enamel finish. Polymer control box cover. All shafts protected by yellow chromate coating.

Mounting (Low Headroom Design)

Ceiling-mounted with only 6.25" headroom clearance required below the tracks.

ECB Units (BOARD 070) (OE):

24VDC relaying circuit with a 40VA class II transformer, non-volatile memory.
Features available:

Contactor Units (OO):

24VAC control circuit, 40VA class II transformer, fuse protected on output, heavy-duty across-the-line linear reversing contractor with mechanical interlock.

Control Accessories

Angled terminal strip allows for the connection of 3-button staions (one supplied with the operator), non-monitored sensing edges, non-monitored photo cells, one push-button radio control (external strip), ceiling pull switches, key switches, loop detectors, external interlocks, plug-in radio card and universal auxiliary output module. 2A fuse protected 24VAC output is available for accessory power supply. NEMA 4/12 for NEMA 4X protected monitored photo cells upgrade available.

Environmental Modifications

NEMA 4/12 and NEMA 4X enclosures. For NEMA 7/9 consult Door Surgeon at 780-448-9498.

Mechanical Accessories

Wall or hood mounting bracket, chain spreader, etc.
For more options contact Door Surgeon at 780-448-9498.

Cycles Ideal For Back Room Door Height Head Room for Tracks
25 cycles / hour Industrial Standard Lift + 4'5" 4"
(80 cycles / day) (1350mm) 102mm

Operator Range and Current Consumption (Amp)

Horse Power 115V
1 HP
1 HP
3 HP
3 HP
3 HP
1/2 8.0 4.0 2.1 1.0 8.0
3/4 11.2 5.6 3.2 1.5 1.2

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