Pilz PNOZ s4.1 Safety Relay is suitable for monitoring E-STOP and safety gates. The PNOZ s4.1 area of application also includes monitoring of light guards. In the application at plants and machines, one PNOZsimga safety relay is used per safety function. The PNOZ s4.1 has three safe and diverse safety contacts. The safety relay has been approved for use in burner controls. It is approved in accordance with the standard EN 50156-1 for electrical equipment on furnaces and it fulfils the requirements for application design and installation.