Rotary locking mechanism for CEE connectors — prevents accidental disconnection of power cables under load.
Technical Details
Powerlock connectors are designed according to CEE standards for 400V/125A in three-phase current and feature five poles (three phases, neutral, protective earth). The plug housing diameter is 107mm, and the protection rating is IP67. Typical variants include 32A, 63A, and 125A versions, with the plugs being mutually exclusive due to different keyway positions. The bayonet system requires a 90-degree turn to engage and disengage. High-quality versions use silver-plated contacts and reinforced housings made of glass-fiber-reinforced polyamide.
History & Development
The Powerlock system evolved in the 1970s from the need to safely transport large amounts of power to film lights. Originally designed by Hubbell for industrial applications, the standard became established in Hollywood through companies like Mole-Richardson from the early 1980s onwards. The characteristic blue color of the 125A version became a hallmark of professional film sets. With the advent of LED technology, lower amperage classes were additionally developed from 2010 onwards for more energy-efficient lighting.
Practical Use in Film
Powerlock connections are mainly used with HMI lights from 2.5kW upwards, such as those used for daylight shooting in "Blade Runner 2049" (2017). The gaffer installs the distribution from the generator to strategic junction points on set, from where individual fixtures are powered. For exterior shots, the waterproof construction allows for use in adverse weather conditions. Disadvantages include the high weight of the cable connections and the need for trained electricians for installation under load conditions.
Comparison & Alternatives
In contrast to conventional Schuko or CEE connectors, Powerlock offers higher current carrying capacity in a more compact design. Modern alternatives like True1 connectors from Neutrik achieve similar specifications with improved ergonomics. For smaller LED fixtures, multipin systems are increasingly used, while on large productions, Camlock connectors on generators feed the Powerlock distribution. The choice depends on the required power, mobility, and availability of infrastructure.