4A05326G01 8-Channel Heavy-Duty Isolated High-Current Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4A05326G01 8-Channel Heavy-Duty Isolated High-Current Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

The 4A05326G01 is a nuclear safety-grade high-current discrete output terminal subcard designed for Emerson Westinghouse Common Q Class 1E safety Instrument & Control platform. It acts as the galvanically isolated power drive interface between rack discrete output control boards and field heavy inductive loads, including emergency trip solenoid valves, safety isolation contactors, large alarm horn annunciators and high-power interlock actuators.

Description

1. Product Title

4A05326G01 8-Channel Heavy-Duty Isolated High-Current Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

This module receives low-power digital control signals output by the DCS rack core board, and converts them into stable high-current drive signals with independent channel isolation, multi-stage EMI filtering and built-in freewheeling back EMF absorption circuits. It effectively suppresses reverse electromotive force interference generated by inductive loads, long-distance cable lightning surges and ground loop potential drift existing in nuclear containment areas, thermal power boiler safety systems and petrochemical explosion-proof hazardous zones.

The PCB adopts multi-layer V-0 flame-retardant high-Tg FR-4 substrate, equipped with thickened hard gold-plated backplane gold fingers and large-current anti-corrosion nickel-gold screw wiring terminals, which can sustain stable heavy-current transmission under long-term high-temperature, high-humidity and dusty harsh industrial operating conditions. Each channel is fitted with independent fast-blow high-current fuses, reverse wiring blocking and instantaneous short-circuit automatic cut-off protection. Faults on a single channel will be independently isolated without disrupting other safety trip loops or damaging the rack’s core control equipment. The card supports single-module hot swapping under energized racks to reduce field heavy-load actuator wiring maintenance downtime. All finished modules pass 72-hour full-load high-low temperature cyclic aging testing and fully comply with NRC Nuclear Class 1E safety certification standards, providing reliable high-current isolated drive access for critical emergency safety shutdown loops of nuclear-grade control racks.

3. Parameter Specification Sheet

Basic Information

Part Number: 4A05326G01
Brand: Emerson / Westinghouse
Product Type: Heavy-Duty High-Current Isolated Discrete Output Field Terminal Daughter Card
Compatible Platform: Common Q Class 1E Safety Instrument & Control DCS System
Matching Supporting Modules: Discrete output master control boards, 49E-3649 rack backplane, 475HP1ENA9GMT redundant rack power supply
PCB Material: Multi-layer isolated high Tg FR-4, V-0 flame retardant
Surface Treatment: Thick hard gold plating for backplane connectors; nickel-gold high-current anti-oxidation screw field terminals
Overall Dimensions: 122mm × 67mm × 21mm
Net Weight: 60g
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 wide voltage adaptive
Primary Power Circuit Inductance Limit: ≤23μH

Electrical & Drive Performance

Rated Supply Voltage: DC 12V / DC 24V dual wide input
Output Channels: 8 fully independent isolated heavy-current drive channels
Per-Channel Continuous Rated Output Current: 5A
Built-in Circuit: Large-capacity freewheeling absorption circuit for high-power inductive loads
Single Channel Isolation Dielectric Strength: Field load side ↔ rack internal logic 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 & Diagnosis Functions: Per-channel independent high-current fast fuse protection, bidirectional lightning surge transient absorption, reverse wiring blocking, load short-circuit automatic cut-off, inductive load back EMF clamping, ground loop interference suppression, channel fault signal upload to rack main CPU
Hot Swap Operation Rule: Single heavy-current output terminal card supports hot plug replacement; other safety drive channels remain normally energized during module maintenance

Mechanical & Installation Specifications

Mounting Method: Plug-in docking with Common Q standard rack backplane 49E-3649
Interfaces: Dedicated exclusive gold finger backplane connector + large-caliber anti-loosening screw-type high-current 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 heavy-load emergency trip drive isolation component
Global Certifications: CE, UL508, IEC60204-1
Pre-delivery Test Items: 72-hour high-low temperature cycle aging test, long-term high-current inductive load 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 modules and factory refurbished modules

4. Application Fields

Nuclear power plant Common Q Class 1E safety I&C system, heavy-current drive terminal for reactor protection cabinet emergency shutdown solenoid valves and safety contactors
AP1000 nuclear Post-Accident Monitoring System (PAMS), high-power safety isolation valve and accident alarm annunciator isolated drive interface board
Thermal power & hydropower stations, boiler fuel emergency shutoff valves, turbine overspeed trip contactors and fire alarm high-power horn terminal module
Petrochemical explosion-proof DCS distributed control system, reactor emergency cut-off high-current solenoid valve safety wiring card
Offshore oil & gas platform explosion-proof safety automation rack, wellhead emergency shutdown safety valve and high-power trip relay drive board
Large diesel generator safety sequential control cabinet, overspeed trip solenoid and cooling system emergency isolation valve heavy-current output subcard
Municipal large-scale water treatment safety interlock DCS rack, chemical leakage emergency cut-off valve and high-power alarm device drive terminal board
Metallurgy & cement kiln-furnace production line, high-temperature furnace emergency safety isolation valve and accident warning horn heavy-load discrete output module

Content Verification Note

Confirmed fixed factual information: 4A05326G01 is Emerson Westinghouse Common Q series standard 8-channel heavy-current discrete output terminal daughter card, supporting 5A per channel high-power inductive loads, independent channel 1500V isolation and multi-layer safety protection, single-module hot swappable, compliant with NRC Nuclear Class 1E safety standards, matched with rack backplane 49E-3649 (unified coding specification for Common Q nuclear-grade DCS spare parts)
Standardized derived content: Title, product brief, parameter specifications and application fields 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.

Optional Short Standalone Titles

4A05326G01 8-Channel 5A Heavy-Current Discrete Output Terminal Card for Class 1E Nuclear DCS
4A05326G01 Common Q Nuclear-Grade Emergency Trip Solenoid Drive Interface Daughter Card
4A05326G01 Isolated High-Current Field Wiring Board for Nuclear Safety Shutdown I&C Rack

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