4D33645G01 Standard 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

4D33645G01 Standard 16-Channel Low-Current Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

The 4D33645G01 is NRC Class 1E nuclear safety qualified low-power discrete output signal isolation terminal subcard developed for Emerson Westinghouse Common Q nuclear safety Instrument & Control rack platform. It serves as a galvanic isolation drive interface between rack discrete output logic master boards and field low-power auxiliary loads including equipment status indicator lamps, miniature signal relays, local alarm annunciators and small auxiliary interlock actuators.

Description

1. Product Title

4D33645G01 Standard 16-Channel Low-Current Isolated Discrete Output Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

This terminal board receives digital logic control signals from the rack main CPU, converts low-level internal control signals into standard isolated drive signals for on-site low-power devices. Each channel adopts independent galvanic isolation circuit, multi-stage LC low-pass EMI filters and built-in freewheeling absorption loops to suppress back EMF interference of miniature inductive loads, long-distance cable lightning surges and ground loop potential differences existing in nuclear auxiliary buildings, thermal power auxiliary rooms and general petrochemical non-high-risk process workshops.

The PCB is multi-layer V-0 flame-retardant high-Tg FR-4 substrate, equipped with standard hard gold-plated backplane gold fingers and anti-corrosion nickel-plated anti-loosening field screw terminals, maintaining stable long-term output accuracy under continuous high-temperature, high-humidity and dusty industrial environments. Every channel integrates independent small-current fast fuse overcurrent protection, reverse wiring blocking and load short-circuit automatic isolation; faults on a single channel 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 racks to reduce field auxiliary circuit wiring maintenance downtime. All finished boards pass 72-hour full-load high-low temperature cyclic aging testing and fully meet NRC Nuclear Class 1E safety certification standards, providing cost-effective stable isolated low-power drive output for conventional safety auxiliary indication and interlock control loops of nuclear-grade safety racks.

3. Parameter Specification Sheet

Basic Information

Part Number: 4D33645G01
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 status 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 lights, 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 lights 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

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