This part is a kind of semiconductor called SPC-704.
Function of this product has adjustable setpoint controllers.
Manufacturers : Migatron Corporporation
Image and pinout :
Some of the text within the PDF file :
Features Adjustable Setpoint Controller Analog Input Form C Relay Outputs Analog Output SPC-701, SPC-704 SPC-701 One Adjustable Setpoint Snap Track Mount or DIN Rail Mount DC Power In Feed Through Sensor Excitation power WAGO Press Terminal Blocks SPC-704 Four Adjustable Setpoints DIN Rail Mount AC or DC Power In Sensor Excitation power Removable Terminal Blocks helps alleviate false trips during sudden signal changes. These controllers have easy to view bright LEDs that show the relay and Power On status. The relay outputs can handle up to 3 amps. The SPC-701setpoint controller can be mounted on Snap Track, DIN Rail (with optional DIN Rail mounting bracket, Part #7942742) or four studs. The terminal blocks are press to open for easy wiring. The [ ... ]