DCDU300A

3. Technical Specifications by Product Category

3.1 Surge Protection Circuit Boards (AC / DC / Signal)

3.1.1 Structural & Material Parameters

• Substrate: High-temperature FR4 fiberglass circuit board

• Surge suppression components: Metal oxide varistors (MOV), gas discharge tubes, inductive filtering coils

• Insulation housing: Flame-retardant engineering plastic, UL94 V-0 fire rating

• Assembly form: Integrated modular PCB board, batch modular arrangement for cabinet centralized installation

3.1.2 Electrical Performance Index

3.1.3 Environmental Adaptability

• Operating temperature: -40℃ ~ +70℃

• Storage temperature: -45℃ ~ +85℃

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

• Protection grade: IP20 (indoor cabinet installation)

3.2 Heavy-Current Terminal Blocks (Multi-Current Specifications)

3.2.1 Mechanical Structure

• Conductive body: High-purity copper alloy, silver-plated surface for low contact resistance

• Clamping structure: Screw-type two-hole/four-hole wiring terminal, transparent dust-proof insulation cover

• Base housing: Reinforced flame-retardant PA66 plastic, anti-aging, anti-cracking

• Mounting method: DIN rail standard buckle installation, quick disassembly

3.2.2 Electrical Parameter Range

• Rated current series: 57A / 100A / 200A / 300A

• Rated voltage: ≤1000 V AC / ≤1500 V DC

• Applicable conductor cross-section: 4mm² ~ 300mm² copper cable

• Contact resistance: ≤200 μΩ

• Short-time withstand current: 5 times rated current for 5s without deformation or ablation

3.2.3 Mechanical Reliability

• Screw tightening cycle: ≥500 times without sliding thread

• Vibration resistance: 10–150Hz sinusoidal vibration, no loose wiring terminals

• Protection grade: IP20 indoor cabinet use

3.3 Rack-Mounted DC Power Distribution Unit (DCDU)

3.3.1 Overall Structure

• Chassis: 19-inch standard 1U rack-mounted metal cabinet, black anti-corrosion coating

• Distribution circuit: Multi-channel independent output loops with independent circuit breakers

• Input terminal: High-current integrated wiring terminal block compatible with 300A-level input

• Auxiliary function: Fault alarm label, voltage/current test reserved port

3.3.2 Electrical Specifications

• Rated input DC current: Max 300A

• Input rated voltage: -48V DC standard communication power supply

• Output branch: Multiple independent overcurrent protection branches

• Branch protection: Miniature circuit breaker for each output loop, overload short-circuit automatic tripping

• Insulation & anti-surge: Built-in secondary surge protection circuit for DC input busbar

3.3.3 Application Compatibility

Suitable for centralized power distribution of communication base stations, data room equipment, industrial DC power supply cabinets, supporting parallel multi-unit expansion.

4. Application Scope

4.1 Power System

Cover power plant generator sets, high-voltage & medium-voltage transmission lines, low-voltage distribution cabinets, power distribution room secondary control loops. Provide lightning surge protection and high-current wiring connection for all power generation, transmission and distribution links.

4.2 Communication Industry

Ground communication base stations, room communication equipment, satellite communication power supply modules, signal transmission wiring loops. Stabilize DC power supply and protect signal ports from lightning surge damage.

4.3 Transportation Industry

Vehicle electronic control systems, rail transit power distribution cabinets, new energy vehicle charging pile control loops, traffic signal power supply equipment. Adapt to wide temperature and vibration working conditions.

4.4 Construction & Intelligent Building

Intelligent building weak current cabinet, elevator control power supply, building lighting distribution system, fire-fighting electrical control loops. Match building intelligent electrification and integrated wiring requirements.

5. Universal Safety & Test Requirements

1. All products pass insulation resistance, power frequency withstand voltage, surge impact aging, high-low temperature cycle and vibration reliability tests before delivery.

2. Insulation materials meet UL94 V-0 flame retardant standard, no open flame dripping combustion under overheating fault.

3. Metal conductive parts have anti-oxidation silver plating/tin plating process to avoid increased contact resistance under long-term load.

4. All wiring terminals have clear polarity and current marking, anti-misplug structural design to prevent reverse wiring short circuit.

5. Surge protection modules have built-in thermal disconnection protection; when surge components fail, automatic isolation to avoid power loop short circuit.

6. Installation & Maintenance General Requirements

1. All equipment shall be installed in indoor closed electrical cabinets, avoiding direct rain, dust and corrosive gas environments.

2. Heavy-current terminals must use torque wrench to tighten screws according to rated torque to prevent thermal runaway caused by loose wiring.

3. Surge protection boards shall be regularly inspected every 1–2 years; replace modules with aging surge components in a timely manner.

4. DCDU rack power distribution units shall reserve 20% spare branch capacity for later system expansion.

5. All maintenance operations must cut off the front-end power supply to avoid live-line operation safety risks.

7. Document Revision Statement

This neutral universal technical specification does not involve any enterprise brand, factory address, contact information or proprietary product model codes. Technical parameters can be adjusted according to actual engineering load and standard requirements without prior notice.