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By Open Bear Engineering Team | Category: Gate Automation | Read time: 9 min
A heavy duty swing gate opener is not a standard residential motor with a larger label — it is a fundamentally different class of drive unit. Where a standard swing gate operator delivers 40–100 Nm of output torque, a heavy duty model delivers 400–700 Nm. That is not a marginal difference. It is the difference between a motor that stalls halfway through a cycle and one that drives a 6-metre, 1,200 kg gate leaf open and closed thousands of times a year without strain.
This guide is for property owners, developers, and installers specifying an automatic gate opener for large, heavy, or architecturally significant swing gates. We cover the mechanism, the critical specifications, how to size the motor correctly, installation requirements, and how Open Bear's heavy duty swing gate opener compares to the alternatives available in the market today.
What Makes a Swing Gate Opener 'Heavy Duty'?
The 'heavy duty' designation in gate automation refers specifically to the gate weight and leaf length the operator can drive. There is no universal standard for where 'standard' ends and 'heavy duty' begins, but the practical threshold is around 400–500 kg per leaf and 3–4 metres of leaf length. Beyond those figures, standard residential operators cannot generate sufficient torque to start the gate from rest, particularly in cold weather when lubricants thicken, or when wind loading applies lateral force against the gate panel.
Open Bear's heavy duty swing gate opener is rated for gate leaves up to 1,200 kg in weight and 6 metres in length. The output torque is 650 Nm. For reference, 650 Nm is the torque specification of mid-range turbocharged diesel engines — it is a substantial rotational force applied to a gate arm. The motor operates on 24V DC drawn from a 220V AC mains supply, with a rated current of 20A at peak load.
The orange manual release visible on the motor housing is not decorative — it is a functional safety requirement. Press it and the motor disengages immediately, allowing the gate to swing freely by hand. No tools. No power. No waiting. For sites where emergency access must be maintained during power outages, this feature is non-negotiable.
How a Heavy Duty Swing Gate Opener Works
The swing gate opener connects to the gate leaf via a solid steel arm — a rigid link between the motor's output shaft and the gate's leading edge. When the motor turns, the arm pushes the gate through its arc. The motor is mounted on the gatepost (or an adjacent column), with the arm extending to a bracket welded or bolted to the gate leaf. The geometry of this arm-to-bracket connection determines the effective leverage and, therefore, the actual force applied to the gate.
Open Bear's opener uses a servo permanent magnet synchronous motor. Unlike a standard AC induction motor, the servo motor reads encoder feedback throughout the gate's travel arc. As the gate approaches the fully-open or fully-closed position, the motor decelerates — reducing speed gradually rather than slamming the gate into the stop bracket at full speed. This deceleration is programmable: installers set the angular position at which deceleration begins, and the rate of deceleration, via the controller parameters. The result is a gate that arrives at the stop position smoothly and precisely on every cycle.
The angular speed of the heavy duty opener is 24 degrees per second. For a gate that swings through a 90-degree arc, that is approximately 3.75 seconds from fully closed to fully open — a deliberate, controlled movement rather than the fast snap of a lighter residential operator.
Full Specification Breakdown
Torque — 650 Nm
650 Nm is the maximum output torque at the motor's drive shaft. In practice, the effective force at the gate depends on arm geometry — the further from the hinge the arm connects to the gate, the more leverage it has. A well-specified arm installation at 1 metre from the hinge applies the full 650 Nm benefit. Proper arm geometry is one of the most consequential decisions an installer makes on a heavy duty swing gate project.
Gate Leaf Weight — up to 1,200 kg
1,200 kg is the maximum single-leaf weight the opener can drive. For double-gate configurations — two leaves each up to 1,200 kg — you need two motor units connected to a dual-output controller. The controller synchronises both motors, opening and closing both leaves simultaneously to within a fraction of a second of each other. Dual-gate projects are common in commercial and estate applications where symmetry and simultaneous operation are required.
Leaf Length — up to 6 metres
Maximum leaf length of 6 metres (single door) covers virtually every residential and most commercial swing gate applications. Longer leaves require greater torque to start from rest — the weight of the leaf acts as a pendulum effect — which is why specifying torque against leaf length, not just leaf weight, is critical for accurate sizing.
Operating Temperature — -35°C to 70°C
The operating range of -35°C to 70°C is verified for the motor windings, controller electronics, and lubricants simultaneously. This is not the temperature at which the motor starts to degrade — it is the range within which the motor delivers its rated performance without modification. The F-class thermal protection (155°C winding protection) ensures that even if the motor is worked hard in hot conditions, the windings shut down safely before damage occurs.
Running Noise — ≤65 dB
65 dB is the rated maximum running noise. At normal conversational distance, a heavy duty swing opener is audible — you will hear the motor engaging and the arm moving — but it is not disruptive from inside a building. The majority of the noise in a swing gate system comes from the gate hardware itself (hinges, stop brackets, the gate leaf flexing under load) rather than the motor, which is quiet by comparison.
Connectivity — Bluetooth and WiFi built in
Bluetooth and WiFi are built directly into the heavy duty opener — not available as accessories, not requiring a separate module. Phone control, remote commissioning, and parameter adjustment are available from day one. The included RF remote controls reach 15 metres in open conditions.
Five Access Methods — One Controller
The opener's controller accepts five independent access trigger inputs. All five can be active simultaneously on the same site:
· Push button — hardwired button at gate post or entry panel
· IC card reader — contactless access for staff, residents, or vehicles
· Microwave sensor — vehicle detection for automatic exit triggering
· RF remote control — the two supplied remotes plus any paired additional remotes
· Face recognition terminal — biometric access for high-security or controlled-access sites
This single-controller, multi-input architecture means you do not need to add a secondary controller if your access requirements change after installation. Add an IC card reader in year one, a face recognition terminal in year three — the controller handles it without rewiring.
Heavy Duty Swing Gate Opener vs. Standard Swing Gate Operators
The distinction between a heavy duty and a standard swing gate opener matters most at the specification stage. Standard residential operators — typically rated for 200–400 kg and 3–4 m leaves — are not conservatively rated versions of heavy duty models. They are different motor architectures, different gearbox ratios, and different controller platforms. Using a standard operator on a 900 kg gate will not result in sluggish performance — it will result in motor failure within months, typically with a burned winding or a stripped gearbox.
The most common misspecification is purchasing by price rather than by gate weight. A heavy duty operator costs more than a standard one because it is a more substantial machine — higher-rated motor, heavier gearbox, larger arm hardware. The additional cost is insurance against the much higher cost of a failed motor, a damaged gate, or a site that loses gate access unexpectedly.
For gates between 200–600 kg with leaf lengths under 4 metres, a mid-range operator may be appropriate. For gates above 600 kg or leaves above 4 metres, size directly to the heavy duty specification with torque margin to spare. Open Bear's engineering team can advise on the correct specification for your gate dimensions and expected cycle frequency — contact us before ordering if you have any uncertainty.
Installation Requirements for a Heavy Duty Swing Gate Opener
Heavy duty swing gate openers impose real structural loads on the installation. The motor mounting post must be concrete-anchored — a surface-fixed post will not sustain the torque reaction when the motor drives a 1,200 kg gate from rest. Open Bear provides full anchor bolt specifications in the English installation manual.
Key installation checks before commissioning:
· Gate hinge condition — hinges must be rated for the full leaf weight. Worn or undersized hinges are the single most common cause of heavy duty opener failure after installation.
· Stop bracket positioning — the physical stop bracket must be set correctly so the motor deceleration position matches the physical gate stop. Misalignment causes repeated motor stall at end of cycle.
· Arm geometry — measure the arm connection point on the gate leaf. At 0.8–1.0 m from the hinge pivot, the arm geometry provides optimal leverage for the 650 Nm rated torque.
· Ground clearance — maximum ground clearance under the gate is 50 cm. If the gap is larger, the arm geometry changes in a way that reduces effective torque at the gate.
· Power supply — 220V AC, 50Hz, minimum 20A circuit breaker for the heavy duty model.
What's in the Box
Every Open Bear heavy duty swing gate opener ships as a complete kit, including:
· Motor unit — grey housing with orange manual release, 19.1 kg
· Swing arm — heavy-duty steel arm with mounting bracket
· Anchor bolts — full set for motor post installation
· Controller — packaged separately at 3 kg
· 2× RF remote controls
· All mounting brackets and fixings
· English installation guide, wiring diagram, and parameter table
Nothing is sold as an upsell. Open the box, follow the manual, and installation can start the same day.
Frequently Asked Questions
My gate has two leaves — do I need two motors?
Yes. Each motor drives one gate leaf. For a double-gate, order two units and connect them to a dual-output controller. The controller synchronises both leaves to open and close together. Our team can advise on the correct dual-gate configuration before you order.
Will it work in extreme cold?
The motor, controller, and lubricants are rated to -35°C. The same unit installs in Canada, Scandinavia, and Russia without cold-climate variants or additives. If your site regularly reaches -30°C or below, verify that your gate hardware (hinges, lock mechanism) is also rated for those temperatures — the motor will perform; undersized hinges may not.
How do I know if my gate weighs 1,200 kg or less?
Your gate fabricator can provide the weight of the completed leaf at the time of manufacture. If the gate is already installed, a structural engineer can estimate weight from panel dimensions and material specifications. When in doubt, weigh it — a luggage scale on a temporary suspension rig gives an accurate figure before the opener is fitted.
Can I add phone control after installation?
Bluetooth and WiFi are built into the opener unit — you do not need to add anything. Pair your phone on commissioning day and phone access is live immediately. For sites that added an Open Bear opener before WiFi was integrated, our team can advise on retrofit options.
Is it suitable for coastal or high-humidity sites?
The controller and motor are rated to 95% relative humidity (non-condensing). For coastal sites with salt air exposure, standard gate industry practice applies: protect the motor housing from direct water spray with a canopy or shroud, inspect the arm and bracket hardware annually for corrosion, and use stainless steel fixings throughout the installation. The motor unit itself has no specific additional coastal requirement.
How does Open Bear's heavy duty opener compare to FAAC or Nice?
FAAC and Nice sell their heavy-duty swing operators through distributor chains, which adds cost and extends lead times. Open Bear's heavy duty model delivers 650 Nm and handles gates up to 1,200 kg — a specification that sits in the same bracket as FAAC's C720 industrial range. The key practical difference: Bluetooth and WiFi are standard on the Open Bear unit. Comparable FAAC and Nice heavy-duty models require separate accessory modules for phone connectivity. Factory-direct pricing means no reseller margin between you and the manufacturer.
Related Products
For sliding gates and high-weight vehicle access, see the sliding gate opener — handles gates up to 1,800 kg.
For smaller residential swing gates, see the side-mounted swing door operator — compact, fast, CE certified.
Ready to Specify?
Tell our team your gate's leaf weight, leaf length, hinge configuration, and expected daily cycle count. We will confirm the correct model, advise on arm geometry, and send you a direct factory price. No middlemen. No markup. One business day response time.
About the Author
Leo Chen | Head Of Content team
Produced by the Open Bear Engineering and Content team. All specifications are drawn from Open Bear's factory-verified documentation. Gate operator sizing advice in this guide reflects standard industry practice for DC servo swing gate systems.