Phoenix Contact PLC-RSC-24UC

Phoenix Contact PLC-RSC-24UC

Product Overview
The PLC-RSC-24UC is a PLC-INTERFACE relay module from Phoenix Contact. It consists of a base terminal block and a pluggable miniature relay. The module accepts a 24 V AC/DC input and provides one changeover contact for switching control circuits. It is commonly used for signal isolation, relay amplification, PLC output interfacing, and control circuit switching in industrial automation and building technology.

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Description

Phoenix Contact PLC-RSC-24UC

Technical Specifications

  • Brand: Phoenix Contact
  • Product Family: PLC-INTERFACE
  • Module Type: Relay module
  • Model Series: PLC-RSC-24UC
  • Nominal Input Voltage: 24 V AC/DC
  • Input Voltage Range: 20.6 to 33.6 V AC/DC at 20 °C
  • Typical Input Current: 11 mA at 24 V AC, 8.5 mA at 24 V DC
  • Typical Response Time: 6 ms
  • Typical Release Time: 15 ms
  • Protective Circuit: Bridge rectifier
  • Operating Voltage Display: Yellow LED
  • Power Dissipation: 0.26 W at nominal condition
  • Contact Type: 1 PDT changeover contact
  • Contact Material: AgSnO
  • Maximum Switching Voltage: 250 V AC/DC
  • Mounting: DIN rail NS 35/7.5
  • Connection Type: Screw connection
  • Insulation: Safe isolation according to DIN EN 50178 between coil and contact
  • Overvoltage Category: III
  • Pollution Degree: 3
  • Ambient Temperature: -40 °C to +60 °C
  • Storage Temperature: -40 °C to +85 °C
  • Width: 6.2 mm

Functional Features

  • Universal 24 V AC/DC Input: Accepts both AC and DC control voltages.
  • Pluggable Relay: Allows fast replacement without rewiring the base terminal block.
  • Changeover Contact: Supports normally open, normally closed, and changeover functions.
  • LED Status Indication: Shows coil energization status.
  • Safe Isolation: Provides reinforced isolation between input and output circuits.
  • Slim 6.2 mm Width: Saves space in control cabinets.
  • Integrated Suppression: Includes bridge rectifier and interference suppression circuitry.

Application Scenarios

  • PLC output signal amplification
  • Control circuit isolation
  • Relay interfacing for valves and contactors
  • Machine control panels
  • Building automation systems
  • HVAC control circuits
  • Signal conversion between control and power circuits
  • Industrial maintenance and retrofit projects

Performance Parameters

  • Input Voltage: 24 V AC/DC
  • Response Time: Approximately 6 ms
  • Release Time: Approximately 15 ms
  • Switching Voltage: Up to 250 V AC/DC
  • Contact Configuration: 1 changeover contact
  • Contact Material: AgSnO
  • Isolation Test Voltage: Designed according to DIN EN 50178
  • Module Width: 6.2 mm

Material Composition

  • Housing: Industrial plastic enclosure
  • Relay: Pluggable miniature electromechanical relay
  • Base Terminal Block: Screw terminal block for field wiring
  • Contacts: Silver tin oxide contact material
  • LED Indicator: Yellow operating voltage indicator
  • Internal Circuitry: Bridge rectifier and suppression components

Structural Features

  • DIN Rail Mounting: Installs on NS 35/7.5 DIN rail.
  • Plug-in Relay Design: Relay can be removed and replaced independently.
  • Screw Terminals: Allows secure field wiring.
  • Narrow Housing: 6.2 mm width supports high-density panel layouts.
  • Labelable Terminals: Supports clear identification of input and output circuits.
  • Modular Interface: Compatible with Phoenix Contact PLC-INTERFACE accessories.

Working Principle
When 24 V AC/DC is applied to the coil side, the internal relay energizes through the bridge rectifier and input circuit. The changeover contact switches the output circuit according to the relay state. The yellow LED indicates that the coil is energized. The module isolates the low-voltage control side from the switched load side, allowing PLCs, controllers, or pushbuttons to safely control higher-voltage or higher-current circuits.

Installation Requirements

  • Mount on a compatible NS 35/7.5 DIN rail.
  • Apply 24 V AC/DC within the specified voltage range.
  • Observe correct polarity for DC applications where required.
  • Keep control wiring separated from high-power cables.
  • Use appropriate wire sizes for the terminal ratings.
  • Install separating plates when adjacent modules switch voltages above 250 V.
  • Verify contact ratings before connecting inductive or capacitive loads.

Precautions for Use

  • Do not exceed the 250 V AC/DC switching voltage limit.
  • Verify the load current does not exceed the relay contact rating.
  • Use surge suppression for inductive loads such as relays, solenoids, and contactors.
  • Replace only with compatible Phoenix Contact relay modules.
  • Ensure adequate ventilation in densely packed control panels.
  • For exact switching current, electrical life, and accessory compatibility, refer to the official Phoenix Contact PLC-RSC-24UC datasheet.

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