Phoenix contact PLC-BSC-24DC/21 2966016 interface terminal with 24V single relay REL-MR-24DC/21AU 2961121 with 1x PDP cotact 6A 30Aac/dc

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

PLC-BSC-24DC/21 2966016 screw terminal block technical data

• Nominal input voltage U_N:
  • 24Vdc
• Status display:
  • LED
• Protective circuit:
  • Damping diode
  • Polarity protection diode
• Conductor cross section solid min:
  • 0.14mm²
• Conductor cross section solid max:
  • 2.5mm²
• Conductor cross section stranded min:
  • 0.14mm²
• Conductor cross section stranded max:
  • 2.5mm²
• Connection method:
  • Screw connection
• Stripping length:
  • 8 mm
• Screw thread:
  • M3
• Size (WxHxD):
  • 6.2x80x94mm
• Color:
  • Green
• Ambient temperature (operation):
  • -40...60°C
• Ambient temperature (storage/transport):
  • -40...85°C
• Operating mode:
  • 100% operating factor
• Inflammability class according to UL 94:
  • V0
• Mounting position:
  • Any
• Assembly instructions:
  • In DIN rail in rows with zero spacing

Relay REL-MR-24DC/21AU 2961121 technical data

• Nominal input voltage U_N:
  • 24Vdc
• Typical input current at U_IN:
  • 7mA
• Typical response time:
  • 5µs
• Typical turn-off time:
  • 2,5µs
• Coil resistance:
  • 3390 Ohm +/-10% (20°C)
• Contact type:
  • Single contact, 1-PDP
• Max switching voltage
  • 30Vav
  • 36Vdc
• Limiting continuous current:
  • 6 A
• Min switching current:
  • 10mA (12V)
• Size (WxHxD):
  • 5x28x15mm
• Test voltage winding / relay contact:
  • 4kV (50 Hz, 1 min.)
• Ambient temperature (operation):
  • -40...85°C
• Ambient temperature (storage/transport):
  • -40...85°C
• Mounting position:
  • Any
• Assembly instructions:
  • In rows with zero spacing
• Standards / Regulations
  • IEC 60664
  • EN 50178
  • IEC 62103