DCDU100A

Product Types: Surge protection boards, terminal blocks and DC distribution units.

Core Function: Prevents surge/overvoltage damage and ensures safe power distribution.

Performance: High surge resistance, insulation and short-circuit protection.

Structure: Flame-retardant material, modular design for easy mounting.

Adaptability: Wide temperature range, vibration and moisture resistant.

Application: Widely used in power, communication, traffic and building systems.

Quality: IEC compliant, multi-protection, stable and durable.

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Product Description
Specification
Product Advantage

Product Description

1 Scope

This specification defines general technical requirements, performance parameters, mechanical structure, test standards, application scope and environmental adaptability for PCB lightning protection boards, high-current distribution terminal blocks and rack-mounted DC power distribution units (DCDU).
This document removes all brand names, part numbers, factory information and proprietary identifiers for universal engineering reference.

2 Normative Reference Standards

• IEC 61643-11: Surge protective devices for low-voltage power systems

• IEC 61643-31: Surge protective devices for DC power circuits

• IEC 61643-41: Surge protective devices for signal and control circuits

• IEC 60947-7-1: Low-voltage terminal blocks for copper conductors

• GB/T 18802.1: Low-voltage surge protective devices

• EN 61643 series surge protection standards

3 Product Classification & Functional Description

3.1 PCB Lightning Protection Board Series

3.1.1 AC Power Lightning Protection Board

• Core function: Suppress lightning surge and switching overvoltage on AC power input lines, protect backend electrical equipment from transient surge damage

• Structure: FR-4 fire-resistant PCB substrate, integrated gas discharge tube, varistor, temperature fuse, inductive filter assembly

• Protection mode: Line-Line, Line-Earth combined protection

• Application: AC 220V/380V power supply front-end surge suppression for power, communication and intelligent building equipment

3.1.2 DC Power Lightning Protection Board

• Core function: DC circuit surge absorption for battery power, communication base station power supply, industrial DC control loops

• Structure: Low parasitic capacitance design, built-in thermal disconnection protection to avoid fire risk under failure state

• Protection mode: Positive-negative, positive-earth, negative-earth three-way protection

3.1.3 Signal Lightning Protection Board

• Core function: Protect low-speed signal transmission lines (485, dry contact, sensor signal) from lightning induced surge

• Key feature: Ultra-low series impedance and inter-line capacitance, no signal attenuation under normal working state

• Applicable signal types: Industrial control signal, monitoring signal, alarm loop

3.2 High-Current Distribution Terminal Blocks

General characteristics for all current-spec terminal blocks:

• Housing: Flame-retardant thermoplastic, high temperature resistance, anti-aging

• Conductive part: High-purity copper alloy with silver plating, low contact resistance

• Connection mode: Screw compression wiring, with transparent protective cover for safety inspection

• Mounting standard: DIN rail snap-on installation, modular combination

Classified by rated carrying current:

1. High-current type: 300A rated, double-group large-area copper busbar, suitable for main power incoming distribution

2. Medium-high current type: 200A rated, dual-circuit independent wiring cavity, uniform current distribution

3. Medium current type: 100A rated, compact size for cabinet branch power distribution

4. Small current branch terminal: 57A rated, modular pluggable structure, convenient quick replacement

3.3 Rack-Mounted DC Power Distribution Unit (DCDU)

• Installation standard: 19-inch standard rack mounting, 1U cabinet height

• Input: Single-channel high-current DC input terminal

• Output: Multi-channel independent branch circuits with built-in overcurrent protection devices

• Function: Centralized DC power distribution for communication base stations, data room equipment, industrial rack systems

• Auxiliary design: Warning label area, reserved wiring space, ground bus bar interfac

Specification

4 General Electrical Performance Requirements

4.1 Lightning Protection Boards

1. Maximum continuous operating voltage Uc: Matched with nominal circuit voltage (AC 275V / DC 240V optional)

2. Nominal discharge current In (8/20μs): ≥10kA; Maximum discharge current Imax (8/20μs): ≥20kA

3. Voltage protection level Up: ≤1200V under nominal surge impact

4. Thermal protection: Automatic disconnection when internal component overheats, no short-circuit risk

5. Insulation resistance: ≥1000MΩ between circuit and ground at 500VDC test voltage

6. Dielectric withstand voltage: No breakdown or flashover under 2kV AC 1min withstand test

4.2 Distribution Terminal Blocks

1. Rated insulation voltage: 1000V AC/1500V DC

2. Contact resistance: ≤50μΩ under rated current

3. Short-time withstand current: Meet IEC 60947-7-1 1s short-circuit withstand requirement

4. Wiring torque: 1.2–8N·m (according to current specification)

5. Adaptable wire cross-section: 2.5mm²–300mm² copper conductors

4.3 DCDU Power Distribution Unit

1. Rated input voltage: -48VDC standard telecom power supply

2. Single channel branch rated current: Customizable 10A–60A per outlet

3. Overcurrent protection: Each branch independent circuit breaker protection

4. Total load capacity: Matched with input terminal maximum carrying current

5. Grounding performance: Low-impedance integrated grounding bus

5 Mechanical & Structural Requirements

1. Material flame retardancy: All plastic housing reach UL94 V-0 flame retardant grade

2. Environmental protection: Raw materials comply with RoHS restriction of hazardous substances

3. Protection grade: Bare terminal IP20; with transparent cover IP30 indoor cabinet use

4. Installation compatibility: DIN rail / 19-inch rack dual installation standards

5. Mechanical life: Terminal screw wiring ≥500 times plug/unplug without loose contact; pluggable terminals ≥1000 times insertion cycle

6 Environmental Adaptability

6.1 Working Temperature

• Operating range: -40℃ ~ +80℃

• Storage temperature: -45℃ ~ +85℃

6.2 Humidity & Altitude

• Relative humidity: 5%–95% non-condensing

• Applicable altitude: ≤3000m; derating required above 3000m

6.3 Anti-Environmental Performance

• Anti-vibration: 10–150Hz frequency sweep vibration test without loose components

• Anti-corrosion: Copper conductive parts with anti-oxidation plating, suitable for urban, suburban and mild industrial atmospheric environment

7 Application Fields

1. Power System: Power plant auxiliary equipment, transmission & distribution cabinet, power monitoring terminal surge protection and power distribution

2. Communication Industry: Macro base station, indoor distributed communication equipment, data center cabinet power distribution

3. Transportation Industry: New energy vehicle control system, rail transit signal power supply, traffic monitoring equipment

4. Construction & Intelligent Building: Building intelligent control, monitoring system, elevator power supply, weak current cabinet power distribution

8 Test & Acceptance Criteria

8.1 Routine Factory Test (100% inspection)

1. Visual inspection: No crack, deformation, scratch, missing parts

2. Continuity & insulation resistance test

3. Functional simulation test of protection components

4. Wiring mechanical locking test

8.2 Type Test (Batch sampling / Third-party certification)

1. Surge impact test per IEC 61643

2. Temperature rise test under full rated current

3. Thermal runaway failure simulation test

4. Vibration, high-low temperature cycling aging test

5. Flame retardant performance test of plastic parts

8.3 Acceptance Standard

All test items shall fully comply with the corresponding IEC & national standards without failure, parameter drift or permanent damage after testing.

9 Transportation & Storage Requirements

1. Storage environment: Dry, ventilated warehouse, avoid direct sunlight, rain, corrosive gas

2. Stacking limit: No heavy pressure on packaging to prevent plastic housing deformation

3. Transportation: Avoid violent collision, drop and extrusion during loading and unloading

10 General Safety Instructions

1. Installation, wiring and maintenance must be operated by certified electrical technicians

2. Cut off all power supply before disassembly or replacement

3. Match product rated current and voltage with actual loop parameters strictly, overload use is prohibited

4. Reliable grounding connection is mandatory for all surge protection products to ensure lightning protection performance

5. Regular inspection every 1–2 years for aging, loosening or burnout of internal components

Product Advantage

1

Strong Protection: Effective surge, overvoltage and short-circuit protection.
2

Safe Structure: Flame-retardant material and modular design for safe use.
3

Great Adaptability: Wide temperature range, vibration and moisture resistant.
4

Stable Performance: High insulation and low resistance for steady operation.
5

Wide Compatibility: Suitable for power, communication, traffic and building scenarios.
6

Premium Quality: IEC compliant, multi-protection, stable and long-lasting.