Rack and spindle actuators are the rigid-drive alternative to chains: higher forces, synchronised push points, and weatherproof housings for heavy sashes, louvres, and outdoor structures. DNH supplies UCS rack and spindle actuators, IP65-rated with linked configurations up to 4,000 N, alongside Topp multi-point rack actuators and high-thrust linear stem models for large windows and louver applications.
Key advantages
T-RACK delivers 1,000 N from a single unit and scales to 4,000 N in a four-actuator Synchro configuration.
The whole UCS rack and spindle range is IP65-rated for exposed and outdoor positions.
Topp rack actuators drive two to three push points; linear stem models synchronise up to four actuators.
RWA options included: Topp's S80 RWA to EN 12101-2 and the SHEV-certified ULYSSES aluminium version.
Product range
An overview of key product specifications. Compare products across our product range and partner brands to find the right fit for your application.
UCS: Rack & Spindle Actuators
UCS rack and spindle actuators handle the openings chains cannot: heavy vents, sun blades and louvres, in exposed positions. Spindle models MAX and ULYSSES provide rigid linear thrust, with a slim 34 mm profile on ULYSSES and an RWA/SHEV-certified aluminium version. The T-RACK and RACK families add rack drives with strokes from 180 to 1,000 mm, scalable to 4,000 N in synchronised configurations, all IP65-rated.
Topp: Rack Actuators
Topp rack-and-pinion actuators drive large windows through two to three synchronised push points, with strokes up to 1,000 mm and IP55 protection. The S80 linear stem models add high-thrust automation for outdoor and louver applications, protected up to IP68, including the EN 12101-2 certified S80 RWA.
Why these brands
DNH supplies two complementary Italian ranges. UCS chain actuators are built for dual duty: everyday natural ventilation and smoke and heat extraction within certified fire-safety systems, with dedicated control panels and actuators tested in fire conditions. Topp has specialised in window and door automation since 1996, with chain, rack and linear actuators for windows, domes and skylights, and RWA models certified to EN 12101-2.
Choose UCS where ventilation and fire safety share one system. Choose Topp where window geometry leads: multi-point rack actuators with two to three synchronised push points, plus high-thrust linear stem models for outdoor and louver duty. DNH supports specification and supply either way.
Typical Applications
This product range is deployed across multiple sectors.
