In 1922, during the time period in which London started implementing electricity into their infrastructure, James Harry Castell designed the first interlocking systems to ensure safety of the people and their assets.

Since then, Castell has become a household name for trapped key interlocking systems, providing safety for companies and their workers in wide range of sectors for over 100 years, ensuring the highest quality and integrity.

Castell’s product range helps to improve safety practices and manages risks involved in heavy duty work to ensure risks to workers are reduced.