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Terminal Board Component – Electrical Equipment Manufacturing

Component Specifications

Definition

A terminal board, also known as a terminal block or connection strip, is a modular, insulated device used in electrical systems to create secure, organized connections between multiple wires. In industrial applications like main transformers, it provides a centralized point for connecting incoming and outgoing circuits, facilitating maintenance, testing, and circuit modifications while ensuring electrical isolation and safety.

Working Principle

The terminal board operates by providing metal terminals (usually made of copper or brass) embedded in an insulating base (typically thermoplastic or thermoset material). Wires are secured to these terminals via screws, clamps, or spring mechanisms, establishing electrical continuity between connected circuits while preventing short circuits and maintaining proper insulation resistance.

Materials

Base: Polyamide (PA66), phenolic resin, or polycarbonate with UL94 V-0 flame retardant rating. Terminals: Electrolytic copper (Cu-ETP) or brass with tin or nickel plating for corrosion resistance. Screws: Steel with zinc or chrome plating.

Technical Parameters

IP Rating IP20 (standard) to IP67 (protected)
Mounting Type DIN rail (TS35/TS32), panel, or PCB
Current Rating 10A to 300A
Voltage Rating Up to 1000V AC/DC
Wire Size Range 0.5 mm² to 150 mm²
Dielectric Strength 3000V AC for 1 minute
Insulation Resistance >1000 MΩ
Operating Temperature -40°C to +120°C

Standards

ISO 9001, IEC 60947-7-1, UL 1059, DIN 46277

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Terminal Board.

Parent Products

This component is used in the following industrial products

Main Transformer

The primary voltage transformation component in a rectifier power supply system that steps down or steps up AC voltage to the required level before rectification.

View Product Details

Engineering Analysis

Risks & Mitigation

Electrical shock from exposed terminals
Overheating due to loose connections or overcurrent
Short circuits from insulation failure
Corrosion leading to increased resistance

FMEA Triads

Trigger: Loose terminal screws due to vibration or improper torque
Failure: Increased contact resistance leading to overheating and potential fire
Mitigation: Use spring-clamp terminals, apply correct torque during installation, and implement regular maintenance checks

Trigger: Moisture ingress or chemical exposure
Failure: Corrosion of terminals, reduced conductivity, and insulation breakdown
Mitigation: Select IP-rated or sealed terminal boards, use protective coatings, and control environmental conditions

Trigger: Overloading beyond current rating
Failure: Melting of insulation, terminal damage, and circuit failure
Mitigation: Properly size terminal boards for expected load, install overcurrent protection devices, and monitor operating conditions

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Terminal position tolerance ±0.5mm, screw torque tolerance ±10% of specified value

Test Method

Dielectric strength test per IEC 60947-7-1, current carrying capacity test at rated current until thermal equilibrium, insulation resistance test at 500V DC

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a terminal board and a terminal block?

A terminal board typically refers to a larger assembly with multiple terminals mounted on a single base, often used in panels, while a terminal block is a modular single unit that can be combined on a DIN rail. In practice, the terms are often used interchangeably.

How do I select the right terminal board for a main transformer?

Consider the transformer's voltage and current ratings, environmental conditions (temperature, humidity), required safety certifications (e.g., UL, IEC), wire sizes, and mounting method. Always consult the transformer manufacturer's specifications.

Can terminal boards be used in high-vibration environments?

Yes, but choose models with vibration-resistant features like spring-clamp terminals, locking screws, or additional securing brackets to prevent loosening.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Terminal Board