KEDU QKS8 Safety Interlock Switch Safeties Limit Travel Switches Safety Door Switches F2 M16 for Mechanical and Electrical Equipment with 2NC M16 Cable Gland.250V 14A 400V 8A(2NC/M16): Amazon.com: Industrial & Scientific
ATO Safety Interlock Switch, 4A/24VDC, Safety Key Interlock Switch for Locking/Detecting The Guard Door of Mechanical Equipment: Amazon.com: Tools & Home Improvement
Telemecanique XCSC703 Safety Interlock, Key Unlocking, 2 NC + 1 NO, 1/2 NPT Cable Gland, Metal Enclosure: Circuit Breaker Panel Safety Switches: Amazon.com: Tools & Home Improvement
Idec HS1L-DT44KMSR-G Switch Safety Interlock: Amazon.com: Tools & Home Improvement