The USS121P  is two relay module which converts analog input signal 0 - 10 V to four discrete output states. Relays have SPDT contacts. Built-in hysteresis circuit prevents contacts from "flickering" in switching points. LED diodes indicate output states according to the table:

UWE rising [V]	UWE falling [V]	S1	S2
0	0
3,9	3,2
6,9	6,2
9,9	9,3

- opened contacts   - closed contacts

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