4A05548G01 16-Channel Low-Current Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4A05548G01 16-Channel Low-Current Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

The 4A05548G01 is NRC Class 1E safety-qualified low-power discrete output terminal subcard customized for Emerson Westinghouse Common Q nuclear safety I&C rack system. It acts as galvanic isolation signal conversion interface between rack discrete output logic boards and field low-power auxiliary loads, including status indicator lamps, miniature signal relays, local alarm annunciators and small interlock auxiliary actuators.

Description

1. Product Title

4A05548G01 16-Channel Low-Current Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

This terminal card receives digital control signals from rack master CPU, converts logic commands into standard isolated drive signals for field low-power equipment. Each channel is equipped with independent galvanic isolation circuit, multi-stage LC EMI filter and built-in freewheeling absorption loop to eliminate back EMF interference of miniature inductive loads, long-distance wiring surge noise and ground loop potential deviation existing in nuclear containment, thermal power auxiliary rooms and petrochemical low-risk auxiliary workshops.

The PCB adopts multi-layer V-0 flame-retardant high-Tg FR-4 material, fitted with standard hard gold-plated backplane gold fingers and anti-corrosion nickel-plated anti-loosening field screw terminals, maintaining stable long-term signal output precision under continuous high-temperature, high-humidity and dusty industrial environments. Every channel integrates independent small current fast fuse protection, reverse wiring blocking and short-circuit automatic isolation; single-channel fault will be cut off separately without interfering with other auxiliary indication loops and rack core control equipment. The module supports single-card hot swapping under energized rack to reduce field auxiliary circuit wiring maintenance downtime. All finished boards pass 72-hour full-load high-low temperature cyclic aging test and fully meet NRC Nuclear Class 1E safety certification standards, providing stable isolated low-power drive access for safety auxiliary indication and interlock loops of nuclear-grade control racks.

3. Parameter Specification Sheet

Basic Information

Part Number: 4A05548G01
Brand: Emerson / Westinghouse
Product Type: Low-Current Isolated Discrete Output Field Terminal Daughter Card
Compatible Platform: Common Q Class 1E Safety Instrument & Control DCS System
Matching Modules: Discrete output logic subboards, 49E-3649 rack backplane, 475HP1ENA9GMT redundant rack 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-oxidation screw-type field wiring terminals
Overall Dimensions: 118mm × 64.5mm × 19.7mm
Net Weight: 53g
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-current drive channels
Per-channel Continuous Rated Output Current: 0.7A
Built-in Circuit: Freewheeling absorption circuit for miniature signal relays and indicator lamps
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 Mechanisms: Per-channel independent fast fuse overcurrent protection, bidirectional surge transient absorption, reverse wiring blocking, output short-circuit automatic cut-off, inductive load back EMF clamping, ground loop noise suppression, channel fault state upload to rack main CPU
Hot Swap Regulation: Single discrete output terminal card supports hot plug; other normal auxiliary drive channels keep 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 auxiliary signal drive isolation 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

Nuclear power plant Common Q Class 1E safety I&C system, low-power drive terminal for reactor auxiliary cabinet safety status indicator lights and miniature interlock signal relays
AP1000 nuclear Post-Accident Monitoring System (PAMS), equipment running status annunciator and small auxiliary relay isolated drive board
Thermal power & hydropower stations, boiler auxiliary flame status lamps, turbine auxiliary interlock miniature relay output terminal module
Petrochemical explosion-proof DCS distributed control system, reaction tank running status indicator light and safety alarm small relay wiring card
Offshore oil & gas platform explosion-proof safety automation rack, wellhead equipment status indicator and auxiliary interlock relay drive interface board
Large diesel generator unit safety sequential control cabinet, running fault indicator light and control auxiliary relay discrete output subcard
Municipal large-scale water treatment safety interlock DCS rack, liquid level status lamps and chemical dosing system auxiliary relay drive terminal board
Metallurgy & cement kiln-furnace production line, furnace running state indicator light and high-temperature auxiliary interlock small relay drive module

Content Verification Note

Confirmed fixed factual information: 4A05548G01 is Emerson Westinghouse Common Q standard 16-channel low-current discrete output terminal daughter card, 0.7A per channel design for indicator lamps and miniature relays, 1500V independent channel isolation and multi-layer safety protection, single-module hot swappable, compliant with NRC Nuclear Class 1E safety standards, matched with rack backplane 49E-3649 (based on Common Q nuclear DCS spare parts unified coding specification)
Standardized derived content: Title, product brief introduction, parameter specification and application fields adopt unified international writing specifications for Common Q field signal terminal daughter cards; refer to Emerson official Common Q system operation manual for factory original precise datasheet parameters if necessary.

Optional Short Standalone Titles

4A05548G01 16-Channel Low-Current Discrete Output Terminal Card for Class 1E Nuclear DCS
4A05548G01 Common Q Nuclear-Grade Auxiliary Indication Relay Drive Interface Daughter Card
4A05548G01 Isolated Low-Power Field Wiring Board for Nuclear Safety Auxiliary I&C Rack

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