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4D33755G03 Gen3 High-Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS

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4D33755G03 Gen3 High-Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS
June 10, 2026

4D33755G03 Gen3 High-Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS

Fully qualified to NRC Class 1E nuclear safety criteria, the 4D33755G03 is the third-generation high-performance discrete output terminal daughter card, fully upgraded upon standard G01 and reinforced G02 variants for Emerson Westinghouse Common Q safety I&C platform. It converts digital logic commands from master control boards into galvanically isolated transistor switch signals to actuate critical field safety equipment, including safety solenoid valves, accident annunciator beacons, auxiliary control contactors and low-power safety actuators.

Description

4D33755G03 Gen3 High-Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS

Product Brief

Fully qualified to NRC Class 1E nuclear safety criteria, the 4D33755G03 is the third-generation high-performance discrete output terminal daughter card, fully upgraded upon standard G01 and reinforced G02 variants for Emerson Westinghouse Common Q safety I&C platform. It converts digital logic commands from master control boards into galvanically isolated transistor switch signals to actuate critical field safety equipment, including safety solenoid valves, accident annunciator beacons, auxiliary control contactors and low-power safety actuators.
Each channel features 2000V reinforced isolation paired with 50dB fifth-order multi-stage LC EMI filter banks, which thoroughly suppress mains frequency coupling noise, wide-amplitude ground loop potential offset and high-energy lightning surge transients. The PCB adopts multi-layer thick copper zero-halogen V-0 flame-retardant high-Tg substrate, matched with triple-thick hard gold-plated backplane connectors and heavy-duty corrosion-resistant nickel alloy terminal blocks. This daughter card integrates full-channel high-speed intelligent fault diagnosis, fault transient waveform capture, non-volatile historical fault logging and comprehensive multi-tier circuit protection. It supports hot-swap online replacement without disrupting adjacent safety switching loops, delivering long-term ultra-stable drive performance under extreme composite operating conditions: wide temperature swing, high humidity, heavy dust deposition and sustained strong mechanical vibration.

Parameter Specifications

  1. Part Number: 4D33755G03

  2. Manufacturer: Emerson Westinghouse

  3. Compatible System: Common Q Class 1E Safety Instrument & Control DCS System

  4. Matching Components: Discrete output master logic boards, 49E-3649 rack backplane, 475HP1ENA9GMT redundant rack power supply

  5. PCB Material: Multi-layer thick copper zero-halogen V-0 flame-retardant high-Tg FR-4

  6. Dimension & Weight: 120mm × 66mm × 20.6mm; Net Weight: 59g

  7. Ambient Operating Envelope: Operating Temp -30℃ ~ +75℃; Storage Temp -50℃ ~ +130℃; Humidity 5%~98% RH non-condensing

  8. Power Supply: DC 12V / DC 24V dual wide-range adaptive input

  9. Output Channels: 12 fully independent galvanic isolated discrete output channels

  10. Drive Topology: Isolated transistor switching output for low-power safety field loads

  11. Per-Channel Continuous Rated Load Current: 0.7A

  12. Isolation Index: Single channel 2000V AC isolation withstand; 2000V AC dielectric strength test for 60s; Insulation resistance ≥1500MΩ @500VDC

  13. EMC Performance: Power frequency interference attenuation ≥50dB, fully compliant with IEC 61000-6-2 industrial EMC specification

  14. Protection & Intelligent Diagnosis

    • Per-channel precision constant current limiting

    • Bidirectional ultra-high-energy surge absorption circuit

    • Reverse polarity miswiring lockout protection

    • Microsecond-level open/short-circuit instant fault detection

    • High-precision time-stamped fault code upload to master controller

    • Transient fault waveform full capture & permanent non-volatile fault history storage

  15. Mechanical Reliability: Continuous vibration resistance 10g (10–150Hz); Shock resistance 30g pulse, 11ms duration

  16. Core Function: Single-module hot swappable under energized rack

  17. Certifications: CE, UL508, IEC60204-1, NRC Class 1E nuclear safety certification

  18. Aging Validation: 96-hour full-load high-low temperature cyclic aging plus thermal cycle fatigue durability test

  19. Design Service Life: ≥150,000 hours of 24/7 unattended continuous operation

  20. Warranty Period: 12-month global unified warranty for original factory units & certified factory refurbished modules

Application Fields

  1. Nuclear Power Plant Common Q Safety I&C Racks

    High-isolation safety switching drive terminal for reactor auxiliary cabinet critical safety solenoid valves, containment local accident warning light arrays and safety-grade auxiliary control contactors.

  2. AP1000 Post-Accident Monitoring System (PAMS)

    Heavy-duty anti-interference isolated switching output board for containment isolation vent valves and core accident annunciator alarm devices.

  3. Thermal & Hydropower Main Control Systems

    High-reliability discrete output module for boiler emergency drain solenoid valves, main flue gas isolation dampers and unit critical fault alarm buzzers.

  4. High-Risk Explosion-Proof Petrochemical DCS

    Premium safety drive wiring card for reactor emergency cut-off solenoid valves, storage tank overpressure alarm horns and primary process pump control contactors.

  5. Offshore Oil & Gas Explosion-Proof Automation Racks

    Anti-vibration safety isolation drive interface for wellhead ESD emergency shutdown solenoids, platform multi-stage warning light banks and heating system control contactors.

  6. Large Diesel Generator Safety Sequential Control Cabinets

    Discrete output subcard for unit emergency stop solenoids, critical machinery fault alarm horns and cooling water main pump control contactors.

  7. Municipal Large-Scale Water Treatment Safety Interlock DCS

    High-performance isolation switching drive terminal for pipeline inlet emergency shut-off solenoids, chemical dosing equipment control contactors and sedimentation tank overflow alarm devices.

  8. Metallurgy & Cement Kiln Production Lines

    Heavy-duty safety discrete drive module for kiln high-temperature isolation solenoids, dust removal primary fan control contactors and kiln over-temperature protection alarm horns


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