Releco C9-A41FX24VDC QRC series 24VDC 4PDT 5A relay

Relays are used as an interface between different signal levels or to isolate one signal from another. Relay is similar in function to a contactor. The modules are often used to enable the outputs of PLC's to control higher voltage and current loads. For example, a load voltage can be even 250 V and it will be still completely galvanically isolated from the PLC.

Relays have the following qualities:

• Cheap
• Small size, but compared to size can still connect large currents and voltages
• Simple construction
• Does not interfere with the controlled signal besides for the contacts resistive effect (in practice no effect on anything)
• Can drive alternating current and directed current loads

Some examples of relay applications:

• Control of AC / DC loads
• Application with electrical isolation
• To convert an NPN output into a PNP output
• To convert an PNP output into a NPN output

Relay base is sold separately. Relay socket which is featured in product pictures is there only for illustration purposes.

Relay technical specifications:

• Operating voltage:
  • 24VDC
• Rated contact current:
  • 5A
• Rated contact voltage:
  • 250V
• Type and number of contacts:
  • 4x NC / NO (4x change-over contacts)
• Contact material:
  • AgNi + 0,2µ Au
• Operating current:
  • 43mA
• Operation indicator:
  • LED + visual mark
• Protection:
  • Serial diode for setting the polarity
  • Surge protection diode for overvoltages generated by coil
• Insulation (test voltage V_rms 1min):
  • Contact open:
    • 1000V
  • Contact / contact:
    • 2,5kV
  • Contact / coil:
    • 2,5kV
• Operating temperature:
  • -40...60C°