Siemens 3TK28 34-2AB20 Safety Relay Press Control Unit, Two Hand Control Unit, Spring Loaded Terminals, 2 NO Enabling Contacts, 24VAC Rated Voltage, 45mm Width: Electronic Relays: Amazon.com: Industrial & Scientific
3TK2827-1BB40 | Siemens | PLC-City
Safety Relais DC 24V 3TK28
Siemens 3TK28 Safety Relay 3TK2802-0DB4 | eBay
Siemens 3TK28 25-1BB40 Safety Relay, For Emergency Stop and Protective Doors, Autostart/monitored Start, Screw
Siemens Sirius 3TK28 Safety Controller Run test - YouTube