About us

Our History

Castell Safety International has been at the forefront of trapped key interlocking since 1922 when our founder, James Harry Castell, designed the first interlocking systems to protect the people and assets during the electrification of London.

Timeline
2019

Castell becomes ISO 45001 certified

2016

SPS

The global leading group for interlock safety systems was formed back in 2016. It consists of three market-leading businesses, KIRK, CASTELL, and STI, combining the expertise and high quality products of the three brands.

2012

Castell wins Halma Manufacturing Excellence Award

2012

Castell celebrates 90th anniversary

2005

Launch of new product range Salvo

1999

Mistura

Castell purchases new product range Mistura

1990

Castell UK becomes ISO 9001 certified

1983

Castell purchases Iso-Lok lockout tagout product range

1974

UK Health and Safety at Work Act

1971

Halma Investments Limited purchases Castell Locks Limited (49 years in Halma plc)

1933

Castell granted improvement to padlocks patent (patent number GB430168)

1922

James Harry Castell establishes ‘Castell Locks”

1921

Castell’s oldest recorded order placed by leading UK engineering and heavy industrial company

1920

James Harry Castell patents ‘Castell’ figure interlocking system to protect people during the electrification period in London