Gas PowerSeat® Ascender

Part No. PWRS-G

The Harken Gas PowerSeat® ascender has revolutionized working at height, providing the worker with the ability to ascend quickly, stay in position longer, and work in comfort. The PowerSeat provides quality, convenience, safety, and is the best solution for completing a task on hand.

Fuel consumption varies with weight and usage, but the motor is extremely efficient and only uses a few liters of unleaded gas with four-stroke mix for a full day’s work at height.

The PowerSeat is simple to use and ideal for a wide range of applications: wind turbines, building exteriors, search and rescue – not only as a powered ascender, but also as a portable winch or hauler.

The portable unit weighs just 14 kg (31 lb), so it’s easy to carry around, yet strong, durable, and corrosion-resistant.

PS Speed Control

Speed Control
The unit is operated using a fail-safe dead man's switch to control ascent speed, up to 15 m/min (49.2 ft/min).

PS Break

The braking system controls descent and provides workers protection against free-falls. The encapsulating jaw cover protects fingers and clothing from catching in the winch.


PS Ergonomical Design

Ergonomical design 
The PowerSeat is designed to stay in an upright position, conserving operator energy by eliminating the constant adjustments needed to maintain position.

PS Durability


Stainless steel load-carrying gears and pins provide strength and durability. Sealed gearbox and high-load ball bearings reduce friction under load, are corrosion resistant, and do not require lubrication.


The Harken PowerSeat is CE certified to the Machinery Directive and independently verified by Bureau Veritas.



The PowerSeat is ideal for a wide range of applications: wind turbines, building exteriors, search and rescue – not only as a powered ascender but also as a portable winch or hauler.

  • Construction/Steel Frame and Envelope Projects
  • Renewable Energy/Blade Cleaning
  • Facilities Management/Asset Integrity Inspections
  • Marine Rigging & Vessel Maintenance
  • Stage Management, Filming and Rigging
  • Telecommunications/Mast Erection
  • Architectural/Building Survey
  • Utility and Oil & Gas Sectors
Visit the PowerSeat Website



Max Working Load

Max Ascent Speed

Product Video

Q: Is the PowerSeat just a mechanical ascender?

A: The certification of the PowerSeat allows it to be used as a powered ascender for access, as well as rigged to assist with hauling and pulling. For example, cliff rescue (when anchored to a strong point), or in conjunction with a tripod for confined space/winching operations.

Q: Is the PowerSeat only rated for single person use?

A: No, the PowerSeat can be used in tandem rescue situations to a maximum working load of 273 kg (601.9 lb).

Q: What happens if I inadvertently exceed the working load of the PowerSeat?

A: The gas PowerSeat engine is designed to stall when the working load is exceeded. The electric PowerSeat has a thermal cut-out within the transformer to cut power to the seat. In both cases, the seats are free to descend to release the load. The seats can be restarted to continue use..

Q: What type of fuel does the gas PowerSeat use?

A: The gas PowerSeat runs on unleaded gasoline with a pump octane rating of 86 or higher.

Q: How long does the fuel tank allow for use?

A: A full tank of fuel (0.6 L) allows approximately 1200 m (3937') climb distance at 273 kg (602 lb).

Q: What is the accent speed?

A: Rate of climb is 15 m per minute at 120 kg (49.2 ft per minute at 265.6 lb), 11 m per minute at 273 kg (36.09 ft per minute at 601.9 lbs).

Q: What training is required? Can anyone use the PowerSeat?

A: Use of the PowerSeat must meet the regulations of the nation and industry in which it is used. It is restricted to those certified
for temporary work at height with access and positioning systems using ropes.

This is not PPE equipment: Use in conjunction with a full fall arrest system at all times.

Warnings and instructions

The user must follow the manufacturer's instructions for each component of the system.

These instructions must be provided to the user of this equipment.

The user must read and understand these instructions before using this equipment.

Manufacturer's instructions must be followed for proper use and maintenance of this equipment.

Alterations or misuse of this equipment, or failure to follow these instructions, may result in serious injury or death.