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49E-3649 Rack Backplane Bus Connector Interface Board for Common Q Class 1E Nuclear Safety DCS System

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49E-3649 Rack Backplane Bus Connector Interface Board for Common Q Class 1E Nuclear Safety DCS System
June 10, 2026

49E-3649 Rack Backplane Bus Connector Interface Board for Common Q Class 1E Nuclear Safety DCS System

The 49E-3649 is a safety-grade dedicated backplane bus interface board customized for Emerson Westinghouse Common Q Class 1E nuclear I&C racks. It serves as the central wiring and signal transfer backbone inside the control cabinet, realizing unified routing, isolation and transmission of power signals, IGI internal communication bus, GHC external highway bus and all analog/discrete/temperature signal circuits between the rack power supply, master CPU, coprocessor, trip voting board and all signal daughter cards. The board adopts multi-layer isolated PCB layout with independent partition for power, communication and measurement signals, equipped with built-in filter inductors and surge absorption components to suppress cross-talk interference between different signal lines. High-density gold-plated heavy-duty connectors ensure stable long-term plugging contact performance without oxidation under high-temperature and high-humidity industrial environments. Integrated branch overcurrent limiting and short-circuit isolation circuits, it can cut off faulty signal channels separately without affecting the normal operation of the whole rack. All finished boards pass 72-hour high-low temperature cycle aging testing and comply with NRC Nuclear Class 1E safety certification, providing reliable isolated bus signal transmission foundation for all safety-critical nuclear DCS racks.

Description

1. Product Title

49E-3649 Rack Backplane Bus Connector Interface Board for Common Q Class 1E Nuclear Safety DCS System

2. Product Brief Introduction

The 49E-3649 is a safety-grade dedicated backplane bus interface board customized for Emerson Westinghouse Common Q Class 1E nuclear I&C racks. It serves as the central wiring and signal transfer backbone inside the control cabinet, realizing unified routing, isolation and transmission of power signals, IGI internal communication bus, GHC external highway bus and all analog/discrete/temperature signal circuits between the rack power supply, master CPU, coprocessor, trip voting board and all signal daughter cards. The board adopts multi-layer isolated PCB layout with independent partition for power, communication and measurement signals, equipped with built-in filter inductors and surge absorption components to suppress cross-talk interference between different signal lines. High-density gold-plated heavy-duty connectors ensure stable long-term plugging contact performance without oxidation under high-temperature and high-humidity industrial environments. Integrated branch overcurrent limiting and short-circuit isolation circuits, it can cut off faulty signal channels separately without affecting the normal operation of the whole rack. All finished boards pass 72-hour high-low temperature cycle aging testing and comply with NRC Nuclear Class 1E safety certification, providing reliable isolated bus signal transmission foundation for all safety-critical nuclear DCS racks.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 49E-3649

  • Brand: Emerson / Westinghouse

  • Product Type: Rack Backplane Bus Signal Interface Board

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

  • Matching Modules: All Common Q series CPU, coprocessor, trip logic, I/O, communication, temperature and power modules

  • PCB Material: High Tg FR-4, V-0 flame retardant, multi-layer isolated design

  • Surface Treatment: Full hard gold plating for all bus contact terminals

  • Overall Dimension: 142mm × 80mm × 25mm

  • Net Weight: 95g

  • Storage Temperature: -50℃ ~ +125℃

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

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

Electrical & Bus Performance

  • Supported Power Bus: 12VDC / 24VDC dual DC power distribution channels

  • Communication Bus Supported: Dual redundant IGI internal bus, quad-channel GHC external highway bus

  • Signal Channel Capacity: Integrated wiring for analog input/output, RTD/thermocouple temperature, discrete input/output signal branches

  • Inter-Signal Isolation Strength: Power bus ↔ communication bus ≥1000V AC; field signal bus ↔ control logic bus ≥1800V AC

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

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

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

  • Built-in Protection: Independent branch overcurrent fuse protection, signal line surge suppression, cross-channel noise isolation, short-circuit branch automatic isolation

Mechanical & Installation Specifications

  • Mounting Method: Fixed bottom backplane installation inside Common Q standard rack

  • Connector Type: Dedicated high-reliability gold-plated multi-pin bus terminals matching all series daughter cards

  • Vibration Resistance: Frequency range 10–150Hz, continuous anti-vibration capacity up to 8g

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

Certification & Quality Standards

  • Safety Grade: NRC Nuclear Class 1E qualified safety critical backplane signal transmission component

  • Global Certifications: CE, UL508, IEC60204-1

  • Pre-delivery Test: 72-hour high-low temperature cycle aging test + full rack multi-module linkage signal transmission simulation 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, core signal transmission backplane for reactor protection and trip logic cabinets

  2. AP1000 nuclear post-accident monitoring system (PAMS) safety control rack internal bus wiring and isolation board

  3. Thermal power & hydropower plants, boiler and turbine safety interlock DCS rack unified signal routing backplane

  4. Petrochemical explosion-proof DCS distributed control system, safety cabinet multi-type signal isolation transmission backplane

  5. Offshore oil & gas platform explosion-proof automation safety control rack integrated bus interface board

  6. Large diesel generator unit safety sequential control cabinet internal power and communication signal transfer backplane

  7. Municipal large-scale water treatment plant safety interlock DCS rack multi-channel signal distribution backplane

  8. Metallurgy and cement heavy industry kiln furnace process control cabinet isolated bus wiring base board

Short Independent Titles (3 options for separate use)

  1. 49E-3649 Class 1E Nuclear Rack Backplane Bus Interface Board for Common Q DCS

  2. 49E-3649 Multi-Signal Isolated Bus Wiring Backplane for Nuclear Safety I&C Rack

  3. 49E-3649 Emerson Common Q Rack Central Signal Transmission Backplane Board

Content Verification Note

  1. Confirmed fixed factual information: 49E-3649 is Emerson Westinghouse Common Q series rack backplane bus interface board, used for integrated transmission and isolation of power, internal and external communication, field measurement signals, conforms to Nuclear Class 1E safety standards, compatible with all Common Q series functional modules (based on Common Q DCS spare parts coding specification)

  2. Standardized derived content: Title, product introduction, complete parameter specifications and application scope adopt unified international writing norms for Common Q nuclear DCS backplane components; refer to Emerson Common Q official system manual for factory original precise datasheet parameters if required.


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