DCDU200A

2. Product Classification & General Technical Requirements

2.1 Surge Protection Circuit Boards (SPD Modules)

Covers AC power surge protection board, DC power surge protection board, signal surge protection board.

2.1.1 Electrical Performance

• Comply with IEC 61643-01 / IEC 61643-11 low-voltage surge protection device standards.

• Fast response time ≤25ns for power circuit, ≤100ns for signal circuit, effectively suppress lightning surge and transient overvoltage.

• Multi-stage composite protection circuit, built-in over-temperature and over-current self-failure protection, no follow-up current after action.

• Wide continuous operating voltage range, adapting to AC 0–1000V, DC 0–1500V low-voltage power systems.

• Nominal discharge current and maximum discharge current meet Class II / Class III test requirements for engineering secondary and tertiary protection.

2.1.2 Structure & Material

• PCB substrate: High-temperature flame-retardant fiberglass board, anti-aging and anti-corrosion.

• Protection components: Standardized piezoresistor, gas discharge tube and inductance filter assembly, modular layout for easy disassembly and replacement.

• Insulation grade: UL94 V-0 flame retardant; surface anti-moisture and dust coating treatment.

• Environmental adaptability: Operating temperature range -40℃ ~ +80℃, humidity 0–95% RH non-condensing.

2.1.3 Application Matching

• Power system: Generator sets, transmission and distribution cabinets, low-voltage distribution boxes.

• Communication field: Base station power cabinet, signal transmission equipment, communication power supply.

• Transportation & construction: Vehicle electrical control, intelligent building weak current system.

2.2 High-Current Terminal Connection Modules

Covers multi-specification high-current through-type terminal blocks for DC power distribution.

2.2.1 Electrical Parameters

• Rated load current series covers 57A / 100A / 200A / 300A full range for high-current DC bus connection.

• Conductor clamping structure adapts to 0.05mm² ~ 300mm² copper wire, screw-type clamping with uniform pressure, no wire loosening under vibration.

• Contact resistance ≤0.2mΩ, low temperature rise under long-term full-load operation.

• Insulation withstand voltage ≥2000V AC, no breakdown or flashover during withstand voltage test.

2.2.2 Mechanical & Structural Features

• Shell: High-strength thermoplastic flame-retardant housing, transparent observation window optional for contact status inspection.

• Conductive part: Tinned copper busbar, anti-oxidation and low loss.

• Mounting: Standard 35mm DIN rail buckle structure, quick snap-in installation without extra fixing screws.

• Anti-vibration: Internal limit locking structure, stable connection under vehicle-mounted and outdoor vibration scenarios.

2.2.3 Safety Design

• Clear positive/negative polarity identification, anti-reverse insertion limit structure to avoid miswiring short circuit.

• Closed insulating housing, IP20 protection grade to prevent accidental electric shock.

• Overload heat dissipation channel reserved, preventing thermal melting under long-term overload.

2.3 Rack-Mount DC Power Distribution Unit

2.3.1 Overall Structure

• Standard 1U rack-mounted chassis, compatible with 19-inch standard communication cabinet installation.

• Integrated input busbar + multi-channel independent output circuit breaker, centralized power distribution management.

• Integrated surge protection reserved position, can be matched with SPD boards as an integrated distribution protection system.

2.3.2 Electrical Performance

• Main circuit supports high-current DC input, matched with external high-current terminal modules for bus connection.

• Each output channel equipped with independent miniature circuit breaker, single-channel overcurrent short-circuit protection without affecting other branches.

• Built-in bus overvoltage undervoltage monitoring, optional passive remote alarm contact for fault signal output.

• Uniform bus voltage drop control, balanced power supply for each output channel.

2.3.3 Environmental & Mechanical Requirements

• Chassis: Cold-rolled steel sheet, anti-rust spray treatment, anti-electromagnetic interference shielding performance.

• Working altitude: Up to 3650m, suitable for plateau communication base stations.

• Impact resistance: Pass 10–500Hz vibration test, no loose internal components after long-term operation.

3. Universal Environmental & Mechanical Standards for All Products

3.1 Environmental Conditions

1. Operating temperature: -40°C ~ +80°C

2. Storage temperature: -45°C ~ +85°C

3. Relative humidity: 5% ~ 95% RH, no condensation

4. Altitude: ≤3650m

5. Atmospheric environment: No corrosive gas, flammable dust or strong electromagnetic interference

3.2 Mechanical Strength

• Vibration resistance: 10–500Hz sinusoidal vibration, amplitude 0.35mm, no loose parts or electrical disconnection.

• Impact resistance: 15g acceleration impact test in three axes, shell and internal components remain intact.

• Screw torque standard: Uniform tightening torque for all wiring terminals to avoid sliding wire or thread damage.

3.3 Insulation & Flame Retardant

• All plastic structural parts meet UL94 V-0 flame retardant grade.

• Insulation resistance ≥1000MΩ under normal working environment.

• All exposed live parts isolated with insulating barriers to prevent direct contact.

4. Application Field Technical Matching Requirements

4.1 Power System

• Adapt to full-link power equipment from power plant generator sets, transmission lines to terminal distribution cabinets.

• SPD products support Class I / Class II combined lightning protection for primary and secondary distribution cabinets.

• High-current terminals and DC distribution units match DC power supply cabinet of substation auxiliary power system.

4.2 Communication Industry

• Compatible with 48V DC communication power supply system for macro base stations, micro base stations and room communication equipment.

• Signal surge protection modules support low-frequency and medium-frequency signal lines without signal attenuation.

• 1U rack-mounted distribution unit meets standard communication cabinet installation size, supporting integrated cabinet power distribution.

4.3 Transportation Industry

• Vehicle-mounted electrical control equipment adopts anti-vibration reinforced terminal and surge protection structure.

• Wide temperature range components adapt to extreme temperature changes of vehicle, rail transit and new energy equipment.

4.4 Intelligent Construction

• Matched with building weak current box, intelligent monitoring power supply, elevator control power distribution.

• Modular design facilitates centralized installation in integrated intelligent electrical cabinets.

5. Production & Inspection General Specifications

5.1 Raw Material Control

• Conductive metal parts must use tinned copper or copper alloy, no recycled inferior metal.

• Plastic housing must provide flame retardant certification report; PCB must comply with anti-corrosion and high-temperature standards.

5.2 Routine Inspection Items

1. Appearance inspection: No shell crack, scratch, component offset or cold solder joint.

2. Electrical performance test: Contact resistance, withstand voltage, surge protection discharge parameter verification.

3. Mechanical test: Terminal wire clamping reliability, DIN rail mounting buckle strength.

4. Aging test: 72-hour full-load continuous operation at 60℃ high temperature, no abnormal temperature rise or function failure.

5.3 Packaging & Transportation

• Individual anti-static packaging for circuit boards; shock-absorbing foam buffer for finished modules.

• Outer carton with moisture-proof film, marked with general product classification, no brand or model code printing.

6. Installation & Operation General Guidelines

1. All surge protection modules and terminal blocks are recommended to be installed on standard 35mm DIN rail.

2. DC power distribution unit fixed with standard cabinet screws, grounding terminal reliably connected to cabinet protective ground.

3. Wiring specification: Copper conductors shall be used for connection terminals, stranded wires with wire end ferrules to avoid loose strands.

4. Maintenance: Surge protection modules support hot plug replacement; circuit breakers and terminals can be disassembled separately without cutting off the whole bus power supply.

5. Fault judgment: Surge protection module with state indication function; distribution unit outputs remote fault signal for centralized monitoring system linkage.

7. Compliance Standards Reference

• IEC 61643-01 / IEC 61643-11: Low-voltage surge protective devices

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

• IEC 60529: Degrees of protection (IP code)

• IEC 60068: Environmental testing for electronic components

• IEC TR 63282: Low-voltage DC system power quality specifications