OCX-CTN-85-D-ST PHOENIX

These modular devices feature compact DIN rail-mountable housings designed for space-saving integration inside control cabinets. Built using robust flame-retardant industrial polymers and aluminum enclosures, Phoenix Contact Filter Modules incorporate multi-stage passive filter circuits comprising inductors and capacitors alongside MOV (Metal Oxide Varistor) and gas discharge tube (GDT) surge components. The integrated hybrid technology provides continuous broad-frequency noise attenuation while simultaneously safeguarding connected down-stream loads from switching surges, indirect lightning strikes, and electrostatic discharges. Many units include optical status windows or dry floating contacts for real-time remote diagnostic signaling.

Product Parameters

• Nominal Operating Voltages: Typically ranges from 120 V AC, 230 V AC for single-phase AC systems to 24 V DC for low-voltage signal and power lines.

• Rated Load Current: Models support continuous load currents ranging from 1 A up to 20 A depending on the series and application class.

• Operating Frequency: Standard line frequencies of 50 Hz to 60 Hz for AC versions.

• Attenuation Performance: Symmetrical attenuation greater than 20 dB (at frequencies above 100 kHz) and asymmetrical attenuation greater than 30 dB (at frequencies above 1 MHz).

• Surge Discharge Current: Nominal discharge current capability typically rated between 3 kA and 5 kA (8/20 µs wave shape).

• Voltage Protection Rating: Voltage protection level kept below 0.45 kV to 0.6 kV for safe operation of delicate electronic components.

• Ambient Operating Temperature: -25°C to 70°C (-13°F to 158°F).

• Mounting Type: Standard 35 mm DIN rail mounting (NS 35).

• Ingress Protection Rating: IP20 rated for cabinet integration.

• Terminal Connection Types: Screw terminal block or push-in spring connection technology supporting wire sizes from 20 AWG to 10 AWG.

Product Advantages

Combining active noise filtering and surge protection into a single module drastically reduces required panel space and simplifies wiring layout inside control enclosures.

The high-attenuation passive filter design significantly increases system operational reliability by removing electrical ripple, harmonic distortion, and high-frequency noise generated by nearby variable frequency drives (VFDs) and switching power supplies.

Tool-free push-in connection variants allow fast, vibration-resistant field installation and reduced maintenance downtime.

Integrated visual fault indicators and remote alarm signal contacts enable predictive maintenance monitoring without requiring manual inspection.

Important Considerations and Precautions

A reliable, low-impedance connection to functional ground (PE) is critical for effective common-mode noise suppression and safe surge energy discharge.

Observe the maximum continuous load current ratings during system design; exceeding rated current limits can cause internal thermal overload or failure of the line chokes.

Always install appropriate upstream backup fuses or miniature circuit breakers as specified in the product documentation to prevent catastrophic failure during high short-circuit events.

Ensure the operating voltage match is verified before energizing the module, as overvoltage conditions will prematurely age or trigger the surge protection components.

Mount the filter module as close to the entrance of the control cabinet or protected field device as possible to prevent noise re-coupling onto clean output lines.

Product Applications

• Power Supply Filtering: Placed inline before sensitive 24 V DC power supplies and PLCs to prevent grid-borne line noise and voltage spikes from disrupting automation logic.

• Motor Drive Systems: Filtering input and output control lines associated with Variable Frequency Drives (VFDs) and servo controllers to suppress high-frequency PWM switching interference.

• Process Instrumentation: Protecting sensitive 4-20 mA current loops, temperature sensors, and analytical signal transmitters against transient surge voltages and ground noise.

• Industrial Communication Networks: Safeguarding serial and Ethernet communication gateways operating in harsh electromagnetic environments.

• Building Automation and Infrastructure: Protecting central HVAC systems, power monitoring equipment, and lighting control cabinets against lightning surges and switching transients.

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