11-pin Sub-Magnal B11A circula base Releco C3-A30/AC24V MRC series 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:
  • 24VAC
• Rated contact current:
  • 10A
• Rated contact voltage:
  • 250V
• Type and number of contacts:
  • 3x NC / NO (3x change-over contacts)
• Insulation (test voltage V_rms 1min):
  • Contact open:
    • 1000V
  • Contact / contact:
    • 2,5kV
  • Contact / coil:
    • 2,5kV
• Operating temperature:
  • -40...60C°
• Plug in socket type:
  • According to IEC 60067 standard's sheet 67-II-18a
    • Socket is also known as:
      • 11pin Sub-Magnal base
      • B11A
      • 11C20
      • Circular 11pin relay socket / relay base