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4D33755G04 Gen4 Ultra-High Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS

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4D33755G04 Gen4 Ultra-High Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS
June 10, 2026

4D33755G04 Gen4 Ultra-High Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS

NRC Class 1E nuclear safety fully certified, the 4D33755G04 is the fourth-generation fully optimized flagship discrete output terminal daughter card iteratively upgraded based on G01/G02/G03 for Emerson Westinghouse Common Q safety I&C platform. It converts digital logic control signals from master logic boards into ultra-isolated transistor switching signals to drive reactor critical safety solenoid valves, accident alarm annunciators, primary safety contactors and low-power nuclear-grade safety actuators.

Description

4D33755G04 Gen4 Ultra-High Isolation High-Reliability 12-Channel Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS

Product Brief

NRC Class 1E nuclear safety fully certified, the 4D33755G04 is the fourth-generation fully optimized flagship discrete output terminal daughter card iteratively upgraded based on G01/G02/G03 for Emerson Westinghouse Common Q safety I&C platform. It converts digital logic control signals from master logic boards into ultra-isolated transistor switching signals to drive reactor critical safety solenoid valves, accident alarm annunciators, primary safety contactors and low-power nuclear-grade safety actuators.
Each channel adopts 2200V reinforced galvanic isolation and 55dB fifth-order multi-stage EMI filter arrays to thoroughly eliminate power frequency coupling noise, large-amplitude ground loop potential drift and ultra-high-energy lightning surge transient interference. The PCB adopts multi-layer ultra-thick copper zero-halogen V-0 high-Tg flame-retardant substrate, equipped with quadruple thick hard gold-plated backplane connectors and heavy-duty anti-corrosion nickel alloy large-caliber terminal blocks. This daughter card integrates full-channel microsecond-level intelligent fault diagnosis, fault transient waveform full capture, non-volatile mass historical fault storage, multi-layer all-around circuit protection and uninterrupted hot-swap maintenance function; module replacement will not disturb any safety switching control loops, providing ultra-long-term stable drive performance under extreme composite harsh environments with wide temperature fluctuation, high humidity, heavy dust accumulation and intense sustained mechanical vibration.

Parameter Specifications

  1. Part Number: 4D33755G04

  2. Manufacturer: Emerson Westinghouse

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

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

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

  6. Dimension & Weight: 120mm × 66mm × 20.6mm; Net Weight: 60g

  7. Ambient Operating Conditions: 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 Type: Isolated transistor switching output for nuclear-grade low-power safety field loads

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

  12. Isolation Index: Single channel 2200V AC isolation withstand; 2200V AC dielectric strength test for 60s; Insulation resistance ≥1500MΩ @500VDC

  13. EMC Anti-interference Performance: Power frequency interference attenuation ≥55dB, fully compliant with IEC 61000-6-2 industrial EMC standard

  14. Protection & Intelligent Diagnosis Functions

    • Per-channel high-precision constant current limiting protection

    • Bidirectional ultra-high-energy surge absorption circuit

    • Reverse wiring polarity lockout protection

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

    • Nanosecond high-precision timestamp fault code real-time upload to master controller

    • Full capture of fault transient waveform + permanent non-volatile historical fault storage

  15. Mechanical Reliability: Continuous vibration resistance 12g (10–150Hz); Shock resistance 30g pulse, 11ms duration

  16. Core Feature: Single module hot swappable under energized rack without interrupting safety loops

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

  18. Aging Test Standard: 96-hour full-load high-low temperature cyclic aging test + long-term thermal cycle fatigue durability verification

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

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

Application Fields

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

    Ultra-high isolation safety switching drive terminal for reactor auxiliary cabinet critical safety isolation solenoid valves, containment multi-stage accident warning light arrays and primary safety-grade auxiliary control contactors.

  2. AP1000 Nuclear Post-Accident Monitoring System (PAMS)

    Top-tier anti-interference isolated switching output board for containment core isolation vent valves and reactor core accident full-set annunciator alarm devices.

  3. Thermal & Hydropower Station Main Control Systems

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

  4. High-Risk Explosion-Proof Petrochemical DCS Distributed Control System

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

  5. Offshore Oil & Gas Explosion-Proof Automation Racks

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

  6. Large Diesel Generator Safety Sequential Control Cabinets

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

  7. Municipal Large-Scale Water Treatment Safety Interlock DCS Systems

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