As a core safety product from RIGID, the OSL Series Overspeed Safety Lock is an independent secondary braking device specifically designed for aerial work equipment. We deliver trustworthy working-at-height solutions to global users through our triple-standard system: China National Standards + EU CE Standards + RIGID Factory Standards.
In man-riding applications, an additional safety system in accordance with EN 1808 is mandatory to secure the work basket or platform against falling. The RIGID OSL Series Overspeed Safety Lock is precisely engineered for this purpose.
The OSL Series Safety Lock is an independently mechanical device triggered by speed. It is small, light and compact, mounted directly on the suspended platform where the safety wire rope runs through it. When the working wire rope breaks or the hoist fails, causing the platform to descend rapidly, the OSL Safety Lock automatically and instantly locks the safety wire rope, securely catching the load and preventing the platform from falling.
The product series has not only obtained EU CE certification, but has also been rigorously tested at multiple times the rated load to ensure an extremely large safety margin, providing trustworthy safety protection for your suspended platforms.
The RIGID OSL Series Safety Lock strictly complies with the following international and national standards:
EN 1808:2015 — Safety Requirements for Suspended Access Equipment
CE Certification — Compliant with EU Machinery Directive
Product Data sheet
RIGID Model
Rated Load (kg)
Wire Rope Ø (mm)
Locking Speed (m/min)
Locking Distance (mm)
Weight (kg)
OSL308
630
8.3
30 / 42
≤200
4.4
OSL309
800
9.1
30 / 42
≤200
4.4
OSL510
1,000
10.2
30 / 42
≤200
6.6
OSL512
1,600
11.5
30 / 42
≤200
6.6
OSL714
2,000
14.0
30
≤200
11.5
Note: Weights shown are for base models. Models with Electrical trigger Detection (D) or Support seat (A) are slightly heavier.
Wire Rope Specifications
Applicable Model
Rope Construction
Diameter (mm)
Tensile Strength (MPa)
Min. Breaking Force (kN)
OSL308
4×31SW+FC
8.3
1960
49.4
OSL309
5×19SW+FC / 5×31SW+FC
9.1
2160
62.7
OSL510
5×19SW+FC / 5×31SW+FC
10.2
2160
78.4
OSL512
5×19S+IWR
11.5
2260
117.6
OSL714
5×K26WS-SFC
14.0
2160
156.8
The RIGID OSL Series Safety Lock delivers outstanding performance across all critical safety parameters:
Automatic Overspeed Detection & Locking The centrifugal triggering mechanism inside the OSL continuously monitors the speed of the safety wire rope. If the descending speed exceeds the preset safety threshold (30 m/min or 42 m/min), the centrifugal device triggers automatically, immediately driving the rope locking mechanism into action.
Self-Locking Clamping Technology The safety rope is firmly held between the clamping jaws, preventing any further slippage. The OSL employs an advanced self-locking design principle: the greater the load, the tighter the clamp grips. Meanwhile, the clamping jaw surface is specially designed with sufficient contact area to provide powerful braking force without damaging the wire rope.
Ultra-Short Locking Distance In the event of an accidental fall, the OSL Safety Lock completes locking within an extremely short distance (≤200 mm), effectively reducing the shock factor during a fall and maximizing protection for personnel.
Intuitive Operation & Monitoring
Transparent Sight Window: The lock body features a transparent observation window, allowing operators to visually inspect the rotation status of the centrifugal speed limiter at any time, ensuring proper device operation.
Dual Handle Design: Equipped with separate unlocking and locking handles. Simply rotate the unlocking handle clockwise to release; when needed, manually rotate the locking handle counter-clockwise to lock the wire rope.
Optional Electrical Trigger Detection (D Models) Models with the "D" suffix (e.g., OSL308D) feature a built-in microswitch. Once the safety lock is triggered and locks the wire rope, the microswitch immediately activates and issues a power-cut signal, shutting down the hoist to prevent further equipment damage.
Working Principle
The overspeed safety lock is mainly composed of the support seat, operation handle, rope locking device, and centrifugal triggering device. The safety steel wire rope is pressed onto the rope wheel under the centrifugal triggering device.
When the falling speed exceeds the limited value, the steel wire rope drives the rope wheel to rotate rapidly, causing the centrifugal triggering device to act. This immediately drives the rope locking device to lock the safety steel wire rope, preventing the suspended platform from continuing to fall.
The self-locking principle guarantees safety: the clamping jaws grip tighter as the load increases, making it physically impossible for the rope to slip once the device has been triggered.
As the last line of defense for working at height, the RIGID OSL Series Overspeed Safety Lock is widely used in various scenarios requiring suspended lifting:
Suspended Access Platforms / Gondolas — Providing safety protection for building facade construction, cleaning, and maintenance.
Elevator Shaft Construction — On temporary work platforms during elevator installation.
Boiler furnace maintenance lifting platform: A suspended manned platform used for the inspection and maintenance of refractory materials, membrane walls, and spray gun interfaces on the water walls of large boilers.
Industrial Equipment Installation — Internal or external maintenance of chimneys, cooling towers, large storage tanks, and other tall structures.
In addition, it is widely used for:
Wind Turbine Maintenance — As a fall-arrest device in wind turbine internal elevators or external maintenance platforms.
Bridge Inspection — For suspended inspection platforms beneath bridges.
Shipyard Maintenance — Hull surface treatment and painting platforms in dry docks.
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