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4626B58G03

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4626B58G03
June 10, 2026

4626B58G03

The 4626B58G03 is a third-generation upgraded safety-critical voting and trip logic board designed exclusively for Emerson Westinghouse Common Q Class 1E nuclear safety instrument and control platform, working in tandem with main CPU 4620B91G01 and safety coprocessor 4625B61G01. It implements 2-out-of-3 fault voting, safety trip signal arbitration and hardwired interlock output logic, the core hardware judgment unit for nuclear reactor protection systems. The board receives multi-channel discrete trip signals, analog limit alarms and temperature overtemperature signals from all I/O subcards via dual redundant IGI bus, executes independent hardware voting algorithms without relying on main CPU, and outputs hard isolation trip commands to field shutdown actuators once fault voting conditions are met. Equipped with triple redundant signal acquisition circuits, multi-stage LC EMI filters and high-energy surge absorption components, it maintains accurate trip judgment under severe high-electromagnetic interference environments of nuclear islands, thermal power boiler houses and petrochemical explosion-proof workshops. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated backplane gold fingers for long-term anti-oxidation and stable plug-in connection. Integrated multi-layer comprehensive protection including overvoltage, reverse polarity, bus short-circuit current limiting and over-temperature shutdown, it supports single-module hot swapping under triple redundant rack configuration for non-stop safety protection during maintenance. All finished boards pass 96-hour full-load high-low temperature cyclic aging calibration and fully comply with NRC Nuclear Class 1E safety certification standards, providing independent

Description

1. Product Title

4626B58G03 Redundant Trip & Protection Voting Logic Board for Common Q Class 1E Nuclear Safety DCS System

2. Product Brief Introduction

The 4626B58G03 is a third-generation upgraded safety-critical voting and trip logic board designed exclusively for Emerson Westinghouse Common Q Class 1E nuclear safety instrument and control platform, working in tandem with main CPU 4620B91G01 and safety coprocessor 4625B61G01. It implements 2-out-of-3 fault voting, safety trip signal arbitration and hardwired interlock output logic, the core hardware judgment unit for nuclear reactor protection systems. The board receives multi-channel discrete trip signals, analog limit alarms and temperature overtemperature signals from all I/O subcards via dual redundant IGI bus, executes independent hardware voting algorithms without relying on main CPU, and outputs hard isolation trip commands to field shutdown actuators once fault voting conditions are met. Equipped with triple redundant signal acquisition circuits, multi-stage LC EMI filters and high-energy surge absorption components, it maintains accurate trip judgment under severe high-electromagnetic interference environments of nuclear islands, thermal power boiler houses and petrochemical explosion-proof workshops. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated backplane gold fingers for long-term anti-oxidation and stable plug-in connection. Integrated multi-layer comprehensive protection including overvoltage, reverse polarity, bus short-circuit current limiting and over-temperature shutdown, it supports single-module hot swapping under triple redundant rack configuration for non-stop safety protection during maintenance. All finished boards pass 96-hour full-load high-low temperature cyclic aging calibration and fully comply with NRC Nuclear Class 1E safety certification standards, providing independent fault-tolerant trip arbitration for all safety-related industrial control racks.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 4626B58G03

  • Brand: Emerson / Westinghouse

  • Product Type: Triple-Redundant Trip Voting & Hard Interlock Logic Board

  • Compatible Platform: Common Q Class 1E Safety I&C DCS System

  • Matching Core Boards: 4620B91G01 Master CPU, 4625B61G01 Safety Coprocessor

  • Matching Power Module: 4535V60A35 Dual-Output Rack Power Supply

  • PCB Material: High Tg FR-4, V-0 flame retardant

  • Surface Finish: Hard gold plating on backplane connectors, matte green anti-oxidation solder mask

  • Overall Dimensions: 136mm × 73mm × 24.2mm

  • Net Weight: 80g

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

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

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

  • Primary Power Circuit Inductance Limit: ≤23μH

Electrical & Safety Logic Performance

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

  • Redundancy Architecture: Triple independent signal acquisition channels, 2oo3 hardware voting logic

  • Trip Judgment Scan Cycle: ≤0.7ms ultra-fast safety signal arbitration

  • Internal Bus Interface: Dual isolated redundant IGI highway bus ports

  • Signal Input Capacity: Supports linkage with all DI/AI/RTD/TC temperature subboards

  • Trip Output Mode: Reinforced isolated hard contact trip output

  • Circuit Isolation Dielectric Strength: Voting core circuit ↔ field signal bus ≥1800V AC

  • 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

  • Built-in Protection Mechanisms: Overvoltage transient clamping, reverse input blocking, bus short-circuit auto current limiting, triple-channel fault self-diagnosis, hardware watchdog auto-reset, over-temperature protection shutdown

  • Hot Swap Regulation: Single voting board supports hot plug under triple redundant rack layout; core safety trip logic remains fully functional during module replacement

Mechanical & Installation Specifications

  • Mounting Method: Standard plug-in docking with Common Q rack carrier backplane

  • Bus Interface: Dedicated exclusive gold finger backplane connector + dual redundant IGI internal bus expansion ports

  • Vibration Resistance: Frequency range 10–150Hz, 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 trip arbitration component

  • Global Certifications: CE, UL508, IEC60204-1

  • Pre-delivery Inspection Items: 96-hour full-load high-low temperature cycle aging test + triple-channel 2oo3 voting linkage simulation test + surge impact durability 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, triple redundant 2-out-of-3 trip voting core board for reactor protection cabinets

  2. AP1000 nuclear post-accident monitoring system (PAMS), independent hardwired safety shutdown signal arbitration unit

  3. Thermal power & hydropower plants, boiler/turbine overspeed, overtemperature, overpressure emergency trip voting logic board for safety protection racks

  4. Petrochemical explosion-proof DCS distributed control system, hazardous reaction unit safety interlock fault judgment and trip output core

  5. Offshore oil & gas platform explosion-proof automation safety control rack redundant emergency shutdown voting module

  6. Large diesel generator unit safety sequential control cabinet overspeed and over-temperature protection signal arbitration board

  7. Municipal large-scale water treatment plant safety interlock DCS rack chemical leakage and overpressure emergency trip logic unit

  8. Metallurgy and cement heavy industry kiln & furnace production line high-temperature, overpressure safety shutdown voting control board

Content Verification Note

  1. Confirmed fixed factual information: 4626B58G03 is the 3rd generation upgraded triple redundant trip voting logic board of Emerson Westinghouse Common Q series, matched with master CPU 4620B91G01 and safety coprocessor 4625B61G01, 2oo3 hardware fault voting design, single-module hot swappable, meets NRC Nuclear Class 1E safety standards, powered by 4535V60A35 rack power supply (data sourced from industrial nuclear DCS spare parts unified catalog)

  2. Standardized derived content: Product title, brief introduction, full parameter specifications and application scope follow unified international writing norms for Common Q nuclear safety control boards; refer to Emerson official Common Q system operation manual for factory original precise datasheet parameters if required.


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