About STI

We work to ensure everyone,
everywhere is safe at work

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SERV Trayvou Interverrouillage (STI Interlocks)

Located near Paris in France, STI is represented throughout the world via an extensive network of distributors and salespeople. The commercial team advises and supports customers on the implementation of safety systems, which are adapted to your working conditions.

Who we are 

STI is part of the Sentric group, which consists of three sister companies – Kirk in the US, STI in France and Castell in the UK. Sentric group produces uncompromising safety solutions for businesses whose people and equipment operate in harsh and safety critical environments. 

The Sentric group is part of the Halma Group

What we do

STI provide safety solutions that comply with controlled safety rules and regulations, enabling customers to achieve the required protection at each step of the safety process.

With more than 120 years of experience, STI provide safe environments through smarter protection that adapts to your existing facilities.

STI what we do
STI who we help: Sectors & Applications

Who we help: Sectors & Applications

Originally developed for railway applications, STI’s products were swiftly accepted industry-wide, due to their simplicity and efficiency. STI has supplied systems for staff protection in numerous fields, including; railway and power generation, chemicals and petrochemicals, the steel industry and the food industry.

An R&D department dedicated to your needs

With many decades of experience in the field of safety, the R&D team continue to develop new solutions to meet your ongoing needs. Due to the specialist knowledge within the company, and the synergy with Halma, the team are leading the way with new products to safeguard your people and machines.

Each year STI invests more than 5% of its turnover in research and development to maintain its leading position.

An R&D department dedicated to your needs