IsO/TS 19837:2018 - Safety of Machinery -Trapped Key Interlocking Devices - Principles for design, selection and configuration is the first international ISO document devoted specifically to trapped key interlocking and answers many of the questions that have arisen relating to performance levels, key coding, and power interlocking. It is a significant step forward which will provide more choice for users of interlock devices and systems. Trapped Key Interlocking has its roots in the rail and power distribution industries where sequential control was, and still is, critical to safe, continuous operation. In the 1960's trapped key interlocking was gradually utilised by the manufacturing sector, where isolating machinery before gaining access, was the requirement.
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