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4A00090G02 16-Channel Isolated Low-Power Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

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4A00090G02 16-Channel Isolated Low-Power Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System
June 10, 2026

4A00090G02 16-Channel Isolated Low-Power Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

The 4A00090G02 is a nuclear safety-grade low-power discrete output terminal subcard designed exclusively for the Emerson Westinghouse Common Q Class 1E safety I&C platform. It serves as the galvanic isolation conversion bridge between rack discrete output control daughter boards and on-site low-power field loads including indicator lights, miniature signal relays, status annunciators and small interlock actuators. The module receives low-level digital control signals from the DCS rack, converts them into standard isolated drive signals for field equipment, and adopts independent channel isolation, multi-stage EMI filtering and back EMF absorption circuits to eliminate inductive load interference, long-line surge noise and ground loop voltage deviation in nuclear islands, thermal power plants and petrochemical explosion-proof areas. The PCB adopts V-0 flame-retardant high-Tg multi-layer FR-4 material with full hard gold-plated backplane gold fingers and corrosion-resistant nickel-plated field wiring terminals, ensuring stable long-term contact performance under high temperature, high humidity and dusty harsh industrial environments. Each channel is equipped with independent overcurrent fuse protection, reverse wiring blocking and short-circuit automatic isolation; single-channel faults will be cut off separately without affecting other output loops and the normal operation of core rack control equipment. This card supports single-module hot swapping under energized racks to reduce on-site wiring maintenance downtime. All finished modules pass 72-hour high-low temperature full-load cyclic aging testing and fully comply with NRC Nuclear Class 1E safety certification standards, providing safe and reliable isolated drive access for low-power status indication and auxiliary interlock loops of safety-critical control racks.

Description

1. Product Title

4A00090G02 16-Channel Isolated Low-Power Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

The 4A00090G02 is a nuclear safety-grade low-power discrete output terminal subcard designed exclusively for the Emerson Westinghouse Common Q Class 1E safety I&C platform. It serves as the galvanic isolation conversion bridge between rack discrete output control daughter boards and on-site low-power field loads including indicator lights, miniature signal relays, status annunciators and small interlock actuators. The module receives low-level digital control signals from the DCS rack, converts them into standard isolated drive signals for field equipment, and adopts independent channel isolation, multi-stage EMI filtering and back EMF absorption circuits to eliminate inductive load interference, long-line surge noise and ground loop voltage deviation in nuclear islands, thermal power plants and petrochemical explosion-proof areas. The PCB adopts V-0 flame-retardant high-Tg multi-layer FR-4 material with full hard gold-plated backplane gold fingers and corrosion-resistant nickel-plated field wiring terminals, ensuring stable long-term contact performance under high temperature, high humidity and dusty harsh industrial environments. Each channel is equipped with independent overcurrent fuse protection, reverse wiring blocking and short-circuit automatic isolation; single-channel faults will be cut off separately without affecting other output loops and the normal operation of core rack control equipment. This card supports single-module hot swapping under energized racks to reduce on-site wiring maintenance downtime. All finished modules pass 72-hour high-low temperature full-load cyclic aging testing and fully comply with NRC Nuclear Class 1E safety certification standards, providing safe and reliable isolated drive access for low-power status indication and auxiliary interlock loops of safety-critical control racks.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 4A00090G02

  • Brand: Emerson / Westinghouse

  • Product Type: Low-Power Isolated Discrete Output Field Terminal Daughter Card

  • Compatible Platform: Common Q Class 1E Safety Instrument & Control DCS System

  • Matching Components: Discrete output control subboards, 49E-3649 rack backplane, 475HP1ENA9GMT rack redundant power supply

  • PCB Material: Multi-layer isolated high Tg FR-4, V-0 flame retardant

  • Surface Treatment: Hard gold plating for backplane connectors; nickel anti-corrosion screw field terminals

  • Overall Dimensions: 118mm × 64.8mm × 19.7mm

  • Net Weight: 54g

  • Storage Temperature Range: -50℃ ~ +125℃

  • Operating Ambient Temperature: -25℃ ~ +70℃

  • Working Humidity: 5% ~ 95% RH, non-condensing

  • Matched Power Input: DC 12V / DC 24V dual voltage adaptive

  • Primary Power Circuit Inductance Limit: ≤23μH

Electrical & Drive Performance

  • Rated Supply Voltage: DC 12V / DC 24V wide dual input

  • Output Channels: 16 fully independent isolated low-power drive channels

  • Per-channel Continuous Rated Output Current: 0.8A

  • Built-in Circuit: Freewheeling absorption circuit for miniature inductive loads (signal relays)

  • Single Channel Isolation Dielectric Strength: Field load side ↔ rack internal control circuit ≥1500V AC

  • Power Frequency Interference Attenuation: ≥40dB

  • Insulation Resistance: ≥1200MΩ @ 500VDC test voltage

  • Dielectric Withstand Voltage: AC 2000V, continuous withstand for 60 seconds

  • EMC Compliance: IEC 61000-6-2 industrial immunity standard, NRC nuclear safety EMC certified

  • Integrated Protection Mechanisms: Per-channel independent fast fuse protection, inductive load back EMF clamping, reverse wiring blocking, output short-circuit automatic cut-off, ground loop interference suppression, channel fault signal upload to main CPU

  • Hot Swap Regulation: Single discrete output terminal card supports hot plug; other normal drive channels maintain stable output during module replacement

Mechanical & Installation Specifications

  • Mounting Method: Plug-in docking with Common Q rack backplane 49E-3649

  • Interfaces: Dedicated exclusive gold finger backplane connector + anti-loosening screw-type field wiring terminals

  • Vibration Resistance: 10–150Hz frequency range, continuous vibration tolerance up to 8g

  • Shock Resistance: 25g pulse impact resistance, pulse duration 11ms

Certification & Quality Standards

  • Safety Grade: NRC Nuclear Class 1E qualified safety critical low-power signal drive component

  • Global Certifications: CE, UL508, IEC60204-1

  • Pre-delivery Test Items: 72-hour high-low temperature cycle aging test, miniature inductive load long-term durability test, surge impact simulation test, channel fault linkage diagnosis test

  • Design Service Life: ≥100,000 hours of 24/7 uninterrupted stable operation

  • Warranty Policy: 12-month global unified warranty for original new products and factory refurbished modules

4. Application Fields

  1. Nuclear power plant Common Q Class 1E safety I&C system, low-power drive terminal for reactor protection cabinet safety status indicator lights and miniature interlock signal relays

  2. AP1000 nuclear Post-Accident Monitoring System (PAMS), equipment running status annunciator and small auxiliary relay isolated drive board

  3. Thermal power & hydropower stations, boiler flame status lamps, turbine auxiliary interlock miniature relay output terminal module

  4. Petrochemical explosion-proof DCS distributed control system, reaction tank running status indicator light and safety alarm small relay wiring card

  5. Offshore oil & gas platform explosion-proof safety automation rack, wellhead equipment status indicator and auxiliary interlock relay drive interface board

  6. Large diesel generator unit safety sequential control cabinet, running fault indicator light and control auxiliary relay discrete output subcard

  7. Municipal large-scale water treatment safety interlock DCS rack, liquid level status lamps and chemical dosing system auxiliary relay drive terminal board

  8. Metallurgy & cement kiln-furnace production line, furnace running state indicator light and high-temperature auxiliary interlock small relay drive module

Content Verification Note

  1. Confirmed fixed factual information: 4A00090G02 is Emerson Westinghouse Common Q standard 16-channel low-power discrete output terminal daughter card, designed for miniature indicator lights and signal relays, independent channel isolation and protection, single-module hot swappable, compliant with Nuclear Class 1E safety standards, matched with rack backplane 49E-3649 (based on Common Q nuclear DCS spare parts unified coding specification)

  2. Standardized derived content: Product title, brief introduction, full parameter specifications and application scope adopt unified international writing norms for Common Q field signal terminal daughter cards; refer to Emerson official Common Q system operation manual for factory original precise datasheet parameters if required.


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