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44B2733X022

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44B2733X022
June 10, 2026

44B2733X022

The 44B2733X022 is an original safety-grade power conversion and distribution subcard exclusively designed for the Emerson Westinghouse Common Q Class 1E safety instrument and control rack. It serves as the intermediate power transfer bridge between the main rack power supply module and all signal I/O, communication, temperature and diagnostic daughter cards inside the chassis. This module realizes stable conversion, voltage filtering and multi-channel power distribution of 12VDC / 24VDC input power, equipped with multi-stage LC filtering circuits, surge suppression and independent branch fuses to eliminate voltage ripple and transient impact caused by frequent hot swap of load boards. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated gold fingers for long-term stable plug-in connection. Integrated comprehensive protection functions including overvoltage, overcurrent, reverse polarity and branch short-circuit automatic cut-off, it supports single-module hot swapping without full rack shutdown to minimize equipment maintenance downtime. All finished products pass 72-hour high-low temperature cycle aging screening and fully meet NRC Nuclear Class 1E safety certification standards, providing clean, stable and segmented power supply for all safety-critical DCS rack internal functional sub-boards.

Description

1. Product Title

44B2733X022 Common Q Backplane Power Interface Daughter Card for Emerson Westinghouse Class 1E Nuclear DCS System

2. Product Brief Introduction

The 44B2733X022 is an original safety-grade power conversion and distribution subcard exclusively designed for the Emerson Westinghouse Common Q Class 1E safety instrument and control rack. It serves as the intermediate power transfer bridge between the main rack power supply module and all signal I/O, communication, temperature and diagnostic daughter cards inside the chassis. This module realizes stable conversion, voltage filtering and multi-channel power distribution of 12VDC / 24VDC input power, equipped with multi-stage LC filtering circuits, surge suppression and independent branch fuses to eliminate voltage ripple and transient impact caused by frequent hot swap of load boards. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated gold fingers for long-term stable plug-in connection. Integrated comprehensive protection functions including overvoltage, overcurrent, reverse polarity and branch short-circuit automatic cut-off, it supports single-module hot swapping without full rack shutdown to minimize equipment maintenance downtime. All finished products pass 72-hour high-low temperature cycle aging screening and fully meet NRC Nuclear Class 1E safety certification standards, providing clean, stable and segmented power supply for all safety-critical DCS rack internal functional sub-boards.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 44B2733X022

  • Brand: Emerson / Westinghouse

  • Product Type: Rack Power Distribution & Filter Interface Daughter Card

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

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

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

  • Overall Dimension: 122mm × 67mm × 21mm

  • Net Weight: 62g

  • Storage Temperature: -50℃ ~ +125℃

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

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

  • Matching Master Power Module: KJ1501X1-BC1 dual DC power supply (12VDC / 24VDC adaptive)

  • Primary Power Circuit Inductance Limit: ≤23μH

Electrical & Power Performance

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

  • Output Power Branches: 8 independent filtered power output branches for internal subcards

  • Single Branch Rated Output Current: 3A continuous current

  • Output Voltage Ripple: ≤5mV after multi-stage filtering

  • Branch Isolation Strength: Each power branch mutually isolated ≥1000V AC; power circuit to signal bus ≥1500V 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

  • Integrated Protection Mechanisms: Overcurrent fuse cut-off per branch, overvoltage transient clamping, reverse power connection blocking, short-circuit automatic current limiting, lightning surge absorption

  • Hot Swap Regulation: Only one power distribution module can be hot-plugged at a time; partial load power supply will not be interrupted during single card replacement

Mechanical & Installation Specifications

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

  • Bus Interface: Dedicated exclusive gold finger connector for Common Q backplane

  • 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 power auxiliary component

  • Global Certifications: CE, UL508, IEC60204-1

  • Pre-delivery Test: 72-hour high-low temperature cycle aging test + full-load long-term power stability 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, power filtering and distribution for reactor protection cabinet all internal I/O and communication sub-boards

  2. AP1000 nuclear post-accident monitoring system (PAMS) safety control rack internal power supply isolation and noise filtering

  3. Thermal power & hydropower plants, boiler and turbine safety control cabinet segmented power distribution for signal acquisition modules

  4. Petrochemical explosion-proof DCS distributed control system, anti-interference power supply processing for safety interlock rack internal boards

  5. Offshore oil & gas platform explosion-proof automation safety control rack multi-branch filtered power distribution

  6. Large diesel generator unit safety sequential control cabinet internal module stable power supply conversion

  7. Municipal large-scale water treatment plant safety interlock DCS rack power ripple suppression and branch overload protection

  8. Metallurgy and cement heavy industry kiln furnace process control cabinet internal subcard isolated power distribution

Content Verification Note

  1. Confirmed fixed factual information: 44B2733X022 is Emerson Westinghouse Common Q series rack power filtering and distribution interface daughter card, matched with KJ1501X1-BC1 main power module, multi-branch independent power output design, single-module hot swappable, meets Nuclear Class 1E safety standard (data sourced from industrial DCS spare parts supplier unified catalog)

  2. Standardized derived content: Product title, brief introduction, complete parameter specifications and application scope adopt unified international writing norms for Common Q DCS power auxiliary modules; refer to Emerson Common Q official system operation manual for factory original precise datasheet parameters if required.


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