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By Open Bear Engineering Team | Category: Gate Automation | Read time: 8 min
Commercial glass doors, architectural aluminium entrances, and office access points share a common design constraint: the door itself is the aesthetic statement, and any automation hardware mounted to its face or frame compromises it. The top mounted swing door operator solves this by mounting overhead — above the door, on the transom or door frame — where it sits out of the primary sightline and, in many installations, is concealed entirely behind the frame profile.
This guide covers the top mounted swing door operator category: how it differs from side-mounted and floor-mounted alternatives, the specifications that determine gate and door suitability, installation requirements, and which applications it is genuinely suited to versus where a different operator type is the right specification. All data is drawn from Open Bear's factory-verified product documentation.
What Is a Top Mounted Swing Door Operator?
A top mounted swing door operator is an automated drive unit installed at the top of a door or gate — on the door frame, transom, or overhead rail — with an arm that connects downward to the door leaf. The motor body runs parallel to the door's top edge, typically concealed within or behind the frame profile. The arm extends downward from the motor housing to the door leaf's upper corner, pushing the door through its swing arc from above.
The defining characteristic is the mounting position: above and behind the door rather than to its side. For doors with a full-height frame, transom, or overhead structure, the motor can be positioned entirely out of view from the front approach. From the user's perspective, the door opens automatically with no visible mechanism on the door face or the posts flanking it.
Open Bear's top mounted swing door operator uses a slim aluminium rail housing — 330 mm × 85 mm × 84.4 mm — finished in a brushed silver profile that integrates with standard commercial door frame aesthetics. The unit weighs 5.3 kg, making it the lightest operator in the Open Bear swing range. It handles doors up to 2 metres in leaf length and 200 kg in weight, with an angular speed of 40.75 degrees per second.
How the Top Mounted Operator Works
The motor sits in its rail housing at the top of the door frame. When the controller signals 'open', the servo motor drives the arm downward and outward, pushing the door through its opening arc. The arm geometry for a top-mounted installation differs from a side-mounted one: the arm connects to the upper corner of the door leaf, giving a leverage angle that converts the motor's rotational output into horizontal door movement.
Open Bear's top mounted unit uses the same servo permanent magnet synchronous motor architecture as the rest of the range. Servo feedback provides real-time position monitoring throughout the door cycle — the controller knows where the door is at every point in its arc, decelerates it before the fully-open and fully-closed positions, and reverses it if obstacle resistance exceeds the set threshold. The result is a door that opens smoothly, stops cleanly, and responds to obstacles predictably.
The angular speed of 40.75 degrees per second puts the top mounted operator between the slow, deliberate motion of the floor-mounted unit (48°/s in standard configuration) and the fast pedestrian-gate speed of the side-mounted unit (69.7°/s). For a 90-degree door swing, that is approximately 2.2 seconds from fully closed to fully open — the right cadence for a commercial entrance where users expect a deliberate, smooth opening without the rush of a fast residential gate.
Full Specification Breakdown
Motor Power — 60W
60W is consistent with the side-mounted operator's power rating, reflecting the similar gate weight class both units serve. At 60W, the motor draws minimal current and is readily integrated into a standard commercial building electrical system. For installations sharing a circuit with door locks, access control panels, and lighting, the low power draw simplifies circuit loading calculations.
Output Torque — 34 Nm
34 Nm is the lowest torque in Open Bear's swing gate range — a reflection of the lighter doors this operator is designed for. Commercial glass doors with aluminium frames, timber doors up to 200 kg, and standard commercial swing doors all fall comfortably within the 34 Nm capability. For heavier doors or gates, the side-mounted or heavy-duty models provide the necessary torque step-up.
Maximum Door Leaf Length — 2 metres
2 metres is the longest leaf this operator handles — the largest maximum in the compact swing operator range, covering standard commercial door widths (typically 0.9–1.2 m) up to wider architectural doors used in hotel lobbies, conference centres, and prestige commercial entrances. For doors wider than 2 metres, contact Open Bear's team before specifying — gate weight and leverage geometry both change significantly at wider leaf dimensions.
Maximum Door Weight — 200 kg
200 kg is the rated maximum door leaf weight. This covers timber doors, framed glass panels, aluminium-clad commercial doors, and most architectural swing door configurations used in commercial buildings. Pure frameless glass panels — which can be heavier than they appear due to glass density — should have their weight verified before specifying; frameless glass entrance panels above 12mm thick can approach or exceed 200 kg at standard commercial widths.
Angular Speed — 40.75°/s
40.75 degrees per second produces a measured, professional opening movement — appropriate for a commercial entrance context where a fast-snapping door would feel aggressive and a very slow one would frustrate users. At this speed, a standard 90-degree commercial door swing completes in 2.2 seconds. Paired with a programmed delay before auto-close, this gives users comfortable passage time without the door beginning to close against them mid-stride.
Body Weight — 5.3 kg (lightest in the range)
At 5.3 kg, the Open Bear top mounted operator is the lightest unit in the range — an important specification for overhead mounting where the door frame or transom must support the unit's weight continuously. The slim aluminium extrusion housing distributes this load evenly along its 330 mm length. Standard commercial door frames handle this load without modification; lightweight frameless glass structures should be assessed by a structural engineer before overhead motor installation.
Operating Temperature — -25°C to 70°C
The -25°C to 70°C operating range covers all standard commercial building environments and most exterior-accessible commercial entrances globally. For buildings in climates below -25°C, the heavy duty swing gate opener (rated to -35°C) provides the appropriate cold-climate specification, noting it is sized for exterior gate applications rather than interior door frames.
The Aluminium Rail Housing: Why It Matters for Commercial Installations
Open Bear's top mounted operator's aluminium extrusion housing is not just an aesthetic choice — it is a structural one. Aluminium extrusion profiles have high strength-to-weight ratios, resist corrosion without surface treatment, and integrate cleanly with standard commercial door frame profiles in silver, white, and anodised finishes. The 330 mm profile length matches standard commercial door header dimensions, allowing the unit to sit within the door frame zone without protruding visibly beyond the frame width.
The slim profile — 85 mm wide, 84.4 mm deep — means the unit can often be concealed behind a standard door frame reveal or transom panel without requiring custom cabinetry. For architectural entrances where the frame profile is designed around the operator, this dimension is the starting point for the frame design. Open Bear can provide CAD drawings of the housing profile on request.
Top Mounted vs. Side Mounted vs. Floor Mounted: Choosing Correctly
The three swing door operator installation types serve different design and structural contexts. The decision framework:
· Top mounted: choose when the door has a frame, transom, or overhead rail that accommodates overhead mounting; when a surface-visible side arm is unacceptable; and when floor excavation is not viable. Best for commercial glass doors, office entrances, hotel lobbies, and architectural commercial buildings.
· Side mounted: choose when simplicity and retrofit speed are the priorities, the post geometry allows a side-mounted arm, and the surface-visible motor body is acceptable. Best for residential pedestrian gates and commercial secondary entries. See the side-mounted swing door operator.
· Floor mounted: choose when complete concealment is required and excavation is possible. Best for luxury residential, heritage, and high-end commercial sites where no surface-visible hardware is acceptable. See the floor swing door operator.
Top mounting and floor mounting serve similar design goals — minimising the visible footprint of the automation hardware — but through structurally opposite approaches. Where floor mounting buries the motor below the gate, top mounting elevates it above the door. Which approach is viable depends on the specific door and frame construction. For most commercial glass door applications, top mounting is the natural choice because the door frame inherently provides overhead mounting structure; excavation at a commercial glass entrance is rarely viable.
Ideal Applications for a Top Mounted Swing Door Operator
· Commercial glass door entrances — office buildings, retail showrooms, hotel lobbies, and conference centres where the door is a design feature
· Aluminium-framed commercial doors — standard commercial entrance doors up to 2 m wide and 200 kg
· Architectural residential entrances — properties with a prominent front door where a side-mounted arm would be visible from the street
· Healthcare facilities — hospital and clinic entrances where touchless automatic doors improve infection control
· Accessibility compliance retrofits — converting manual commercial doors to automatic operation to comply with disability access standards
· Office entrance automation — controlled access for staff entry points with IC card or face recognition integration
Access Control Options
The top mounted operator's controller accepts the same five access trigger inputs as the rest of the Open Bear range:
· Push button — hardwired button at the door surround
· IC card reader — contactless access for staff and authorised visitors
· Microwave sensor — touchless proximity trigger for hands-free entry (important for healthcare and hygiene-sensitive environments)
· RF remote control — the two supplied remotes plus additional pairable remotes
· Face recognition terminal — biometric access for high-security or single-occupant access control
For commercial buildings where the access control system is already specified (an existing Wiegand-based access control panel, for example), the Open Bear controller's input terminals accept standard dry-contact signals from third-party access control systems. This avoids the need to replace an existing access control infrastructure when retrofitting automatic door operation.
What's in the Box
Every Open Bear top mounted swing door operator ships complete:
· Slim aluminium rail motor unit — 330 × 85 × 84.4 mm, 5.3 kg, brushed silver finish
· Door arm with adjustable connection bracket
· 2× RF remote controls
· Mounting hardware — all fixings and brackets
· English installation manual with wiring diagram and parameter reference
Installation Overview
Top mounted installation involves fixing the motor housing to the door frame or transom at the correct height and position, fitting the arm to the door leaf's upper corner, and connecting the low-voltage wiring from the motor unit to the controller. The controller mounts separately — typically at the door frame surround or an adjacent wall panel — and is connected to the 220V AC mains supply.
Key pre-installation checks:
· Frame structural integrity: the transom or frame section carrying the motor must support 5.3 kg continuously plus the dynamic load of the arm movement. Standard commercial door frames are adequate; frameless glass structures require assessment.
· Arm geometry: the arm must connect to the door leaf at a point that provides effective leverage throughout the full swing arc. The installation manual provides arm geometry guidance for standard door configurations.
· Door freedom: the door must swing freely through its full arc without binding. Adjust hinges before fitting the operator.
· Clearance: confirm no obstruction exists in the arm's travel path at any point in the door's swing.
· Power supply: 220V AC, standard commercial circuit.
Commissioning follows the standard Open Bear parameter setup procedure: set open and close positions, deceleration angles, obstacle sensitivity, and auto-close delay. The English manual provides a complete parameter table with defaults and adjustment ranges.
Frequently Asked Questions
Can it open outward and inward?
Yes. The motor direction and arm geometry are configured for either outward or inward swing at installation. The controller's orientation parameter determines the motor direction; the arm connection point on the door leaf is adjusted to suit the swing direction. Confirm the intended swing direction with your installer before ordering.
Is it suitable for high-traffic entrances?
The top mounted operator is rated for standard commercial door duty cycles — multiple openings per hour over an extended service period. For very high-frequency applications (hotel main entrance, hospital A&E, transport hub entry) where the door opens hundreds of times per day, verify the expected daily cycle count with Open Bear's team before specifying. High-frequency applications may benefit from a scheduled maintenance programme.
What happens during a power outage?
The controller supports battery backup connection. During a power outage, the door can be configured to hold position, open automatically for emergency egress, or continue normal operation on battery power. For buildings with emergency egress requirements, the fail-open configuration is standard practice — confirm your local building code requirements with your installation contractor.
Does it integrate with an existing access control system?
Yes. The controller's input terminals accept standard dry-contact trigger signals from third-party access control panels, Wiegand readers, and building management systems. Open Bear can provide the wiring interface specification on request.
What is the warranty period?
Open Bear products are backed by the manufacturer's warranty. Contact the Open Bear team directly for warranty terms applicable to your market and order volume — factory-direct supply means warranty queries go directly to the manufacturer, not through a reseller.
Related Products
For a fully concealed installation without overhead mounting, see the floor swing door operator — buried below the gate, completely invisible from any approach angle.
For heavy commercial or industrial swing gates above 200 kg, see the heavy duty swing gate opener — 650 Nm, handles gate leaves up to 1,200 kg and 6 m long.
Ready to Specify?
Tell our team your door's leaf width, leaf weight, frame construction, and access control requirements. We will confirm the top mounted operator is the right specification and provide a direct factory price — no reseller markup, one business day response.
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 product documentation.