Trapped Key Interlocks

Trapped Key Interlocks are used to safely isolate machinery, processes, and hazardous areas in applications where access must be mechanically prevented until the machine or process is confirmed to be in a safe state. These solutions are based on mechanical key trapping and release in a predefined sequence, physically preventing incorrect or premature access to hazardous zones without the use of electrical components. This makes trapped key systems highly reliable, especially in environments where electronic solutions are not suitable or desired.

Our product range includes IDEM Safety Trapped Key Interlock systems, such as the Skorpion range, manufactured from robust die‑cast metal or 316 stainless steel. These systems are designed for demanding and harsh environments, including outdoor installations, dusty locations, and washdown or hygiene‑critical applications. The key systems are factory‑coded and are also available with uniquely coded keys, providing a high level of safety, security, and traceability.

Trapped key systems enable a safe operational sequence using elements such as power or process isolation, key exchange units, access control locks, and personnel keys. They significantly reduce the need for wiring and control logic while supporting machinery safety standards such as ISO 14119. These solutions are widely used in industries such as process and energy production, mining, food and pharmaceutical manufacturing, and heavy machinery, where robust, fail‑safe access control is essential. Our strong product expertise helps design the correct trapped key safety system for each application as part of a comprehensive and standards‑compliant machine safety solution.