PNOZ Sigma 4 by PILZ The PNOZ Sigma S4 series of Safety relay by PILZ. Known for their reliability and durability, PILZ safety relays offer you second to none safety protection features to ensure you and your workplace stay safe. Specifically, the S4 series is suitable for many different applications which you can find listed below. Features and benefits: • LED display that offers you the following measures: - Supply voltage - Input status, channel 1 - Input status, channel 2 - Switch status, safety contacts - Reset Circuit - Error indication • Operating mode can be set via rotary switches • The S2 keeps safe separation of safety contacts from all your other circuits • Plug in connection terminals • 2 safety contacts N/O instantaneous • 1 Semiconductor output Safety features • Self-monitoring built in • Safety functions remain effective in the case of components failure • Correct opening and closing is tested automatically at the end of each on / off cycle • The transform uses an electronic fuse which prevents short circuiting. Applications • E STOP pushbutton • Safety gate limit switches • Reset buttons • Light barriers / devices • PSEN Technical safety parameters • EN 60947-5-1 • EN 60204-1 • VDE 0113-1 How do Safety Relays work and what are they used for? Safety Relays work by helping reduce unnecessary risk and hazard within your circuit. A typical circuit configuration may look like a production line where highly automated machinery works quickly, i.e. a production or packing line in a warehouse or factory. This line forms part of your 'circuit' and along that circuit you will have safety devices in place like emergency push buttons, safety curtains or pressure sensitive mats. To ensure complete safety in these environments, a safety relay can be added to your circuit t...