Phoenix Contact 24V DC Relay Module with 6A Switching Current

Phoenix Contact 24V DC Relay Module

The Phoenix Contact PLC‑RPT‑24DC/21/MS is a compact, high‑performance relay module designed for industrial automation and control systems. It operates on a nominal voltage of 24 V DC and can switch currents up to 6 A, making it suitable for a wide range of applications such as motor starters, lighting controls, heating elements, and safety interlocks.

Key Technical Specifications

• Nominal Voltage: 24 V DC
• Maximum Switching Current: 6 A
• Coil Resistance: Typically around 30–50 Ω (exact value depends on the specific variant)
• Contact Configuration: Normally Open (NO) and Normally Closed (NC) contacts in a single‑pole, double‑throw (SPDT) arrangement
• Mounting Type: DIN rail mounting for easy integration into control panels
• Operating Temperature Range: From -40 °C to +80 °C
• Mechanical Life: Up to 10 000 k cycles (typical)
• Electrical Life: Rated for continuous operation at the specified current and voltage limits

Physical Characteristics

The module features a rugged, DIN rail‑compatible chassis that conforms to the standard IEC 60204‑1 requirements. Its dimensions are approximately 40 mm × 20 mm × 15 mm, allowing it to fit into tight spaces while still providing ample room for wiring and connectors.

Electrical Performance

The relay’s contacts are designed with a low contact resistance of less than 50 mΩ when closed, ensuring minimal voltage drop across the load. The coil current is typically around 100–200 mA, which keeps power consumption low and reduces heat generation.

Application Areas

• Motor Control: Switching starter circuits, overload protection, or motor speed control modules.
• Lighting Systems: Controlling high‑current LED arrays or conventional lighting fixtures in industrial settings.
• Heating Elements: Managing electric heaters that require precise on/off control.
• Safety Interlocks: Implementing fail‑safe mechanisms in safety circuits where a 24 V DC signal is used to trigger high‑current loads.
• Process Automation: Integrating with PLCs, HMIs, or other control devices that use 24 V logic signals.

Integration with Control Systems

The module is fully compatible with Phoenix Contact’s extensive range of PLC, HMI, and I/O devices. Its 24 V DC coil voltage aligns with the standard logic level used in most industrial control panels, allowing seamless wiring to PLC outputs or relay drivers.

When connecting the module:

1. Power Supply: Provide a stable 24 V DC source capable of delivering at least 200 mA.
2. Load Wiring: Connect the load between the NO and NC contacts as required by the application.
3. Control Signal: Wire the coil terminals to a PLC output or relay driver, ensuring correct polarity.
4. Grounding: Follow local electrical codes for proper grounding of the module chassis if necessary.

Reliability and Durability

The Phoenix Contact relay is engineered with high‑quality materials such as stainless steel contacts and a ceramic insulator, which provide excellent resistance to arcing, wear, and environmental factors. The module’s design also incorporates a protective housing that shields the internal components from dust, moisture, and mechanical shock.

Compliance and Standards