How do these safety relays work? - Electrical Engineering Stack Exchange

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Patent US6577245 - Wireless isolation relay for remote metering
Patent US6577245 - Wireless isolation relay for remote metering

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Wiring Diagram
Wiring Diagram

440R-S12R2 Ab Guardmaster Safety Relay, Single Input Pn-114859 - Allen
440R-S12R2 Ab Guardmaster Safety Relay, Single Input Pn-114859 - Allen

How do these safety relays work? - Electrical Engineering Stack Exchange
How do these safety relays work? - Electrical Engineering Stack Exchange

Sainsmart Relay Wiring Diagram
Sainsmart Relay Wiring Diagram

MSR38-D/DP safety relay circuit - Circuit design - Eng-Tips
MSR38-D/DP safety relay circuit - Circuit design - Eng-Tips

Can anybody help me understand the monitoring function in this safety
Can anybody help me understand the monitoring function in this safety

440R-S12R2 Ab Guardmaster Safety Relay, Single Input Pn-114859 - Allen
440R-S12R2 Ab Guardmaster Safety Relay, Single Input Pn-114859 - Allen

shorted solid state relay alarm
shorted solid state relay alarm