Fortress Interlocks Ltd has been at the forefront of developments in safety interlocking for over forty years. A market leader in the design and manufacture of Automated & Trapped Keyed Interlocking systems. With an extensive global distribution network, Fortress supplies industries throughout the world. http://www.fortressinterlocks.com/
Castell Safety Interlocks
Established in the safety industry since its very creation in 1922 Castell offer an unrivalled experience in Trapped Key interlocking products for some of the most demanding applications like Precipitators and Switch Gear. http://www.castell.com/us/
Smith Flow Controls
Smith Flow Control (SFC) was established in 1985 to provide Valve Safety Interlocking solutions for hazardous operations in the oil, gas and chemical processing industries. http://www.smithflowcontrol.com/
HF Securite HF Sécurité is a subsidiary of the British industrial group HALMA, a leader in safety and security fields with worldwide representation. Through our two divisions, PROFALUX SERRURES and RONIS PROTEC, we can offer you a range of Safety Interlocks for Switchgear and other Industrial applications. http://www.hfsecurite.com/anglais/