2963721 Phoenix Contact | Phoenix Contact Dual-Channel Two Hand Control Safety Relay, 24V ac/dc, 2 Safety Contacts | 666-7050 | RS Components
280002 IDEM | IDEM Dual-Channel Emergency Stop, Safety Switch/Interlock Safety Relay, 24V ac/dc, 3 Safety Contacts | 123-2744 | RS Components
![switches - Explanation of structure and function of a safety relay - Electrical Engineering Stack Exchange switches - Explanation of structure and function of a safety relay - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/qKDYF.png)