2981428 PSR-SCP-24DC/ESD/5X1/1X2/300 PHOENIX

A Phoenix Contact Relay Input Module typically belongs to established industrial lines such as the RIFLINE complete or PLC-INTERFACE series. It operates as an input processing stage where external field signals activate the internal relay coil, switching clean, potential-free contact signals that are safely fed into the PLC digital input card. This setup prevents potential ground loops and voltage transients originating from long cable runs in the field from damaging sensitive controller circuitry. The module features a compact, space-saving design with integrated status indication and efficient connection technologies like Push-in or screw terminals, allowing quick wiring and easy installation on standard DIN rails.

Product Parameters

• Coil Input Nominal Voltages: Available in common operational ratings including 12 V DC, 24 V DC, 120 V AC/DC, and 230 V AC.

• Input Signal Range: Accepts wide voltage tolerances typically within +/-10% to +/-15% of nominal input voltage.

• Output Contact Configuration: Available in 1 Form A (SPST-NO) or 1 Form C (SPDT) dry contact arrangements.

• Maximum Switching Voltage: Supports output load switching up to 250 V AC or 125 V DC depending on the specific relay insert.

• Continuous Current Rating: Typical contact switching capability ranging from 50 mA up to 6 A depending on contact material and model.

• Contact Material Options: High-grade Silver Tin Oxide (AgSnO) for standard loads or Gold-plated (AgSnO + Au) contacts for reliable switching of ultra-low current micro-signals.

• Galvanic Isolation: High dielectric isolation strength up to 4000 V rms between coil input and contact output circuits.

• Response and Release Time: Fast switching characteristics with typical operation times between 5 ms and 15 ms.

• Operating Temperature Range: Industrial standard operation from -40°C to 60°C (-40°F to 140°F).

• Mounting Type: Snaps directly onto standard 35 mm DIN rails (NS 35/7,5 or NS 35/15).

Product Advantages

A key advantage of the Phoenix Contact Relay Input Module is its exceptional electrical isolation capability, which safeguards PLC inputs from high-voltage transients and harsh ground potential differences.

Its ultra-slim profile maximizes control cabinet density, saving substantial space on the DIN rail compared to traditional industrial relays.

Tool-free Push-in connection technology allows fast, vibration-proof wiring that drastically reduces installation and maintenance time.

Integrated optical LED indicators provide clear visual diagnostics for input signal status, simplifying commissioning and fault detection.

The pluggable relay design allows effortless replacement of individual wear components without disconnecting signal wiring from the base terminal block.

Important Considerations and Precautions

When selecting and wiring relay input modules, care must be taken to match the field signal voltage and type (AC or DC) precisely to the relay coil specifications.

For switching low-level digital input signals into microcontrollers or low-current PLC cards, gold-plated contacts should be specified to prevent contact surface oxidation over time.

Inductive field loads connected to the input circuit should be equipped with appropriate surge suppression components like freewheeling diodes or varistors to prevent excessive arc discharge.

Do not exceed the maximum allowable switching current and voltage parameters to prevent premature contact welding or insulation breakdown.

Ensure the ambient operating temperature in the cabinet remains within the designated limits, as high temperatures can degrade coil performance and operational lifespan.

Always disconnect power to the wiring panel prior to performing installation, wiring adjustments, or module replacement to prevent accidental short circuits or personal injury.

Product Applications

Phoenix Contact Relay Input Modules are widely implemented across industrial automation systems to ensure safe and dependable signal processing.

• PLC and DCS Input Signal Isolation: Interfacing field limit switches, proximity sensors, pushbuttons, and auxiliary contacts with PLC digital input modules while preventing electrical noise propagation.

• Voltage Level Conversion: Converting high-voltage AC field signals from field devices into low-voltage DC signals compatible with standard PLC inputs.

• Process Automation and Power Generation: Processing critical alarm and status signals in remote power distribution panels, water treatment plants, and chemical processing facilities.

• Factory Automation and Machinery: Transmitting operational interlock signals from moving machinery parts, safety gates, and conveyor networks to central automation controllers.

• Building Management Systems: Connecting HVAC equipment monitoring contacts, lighting controllers, and fire system status lines to centralized monitoring networks.

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