Terminal Blocks - Accessories

Image Part Number Description / PDF Quantity Rfq
0380020028

0380020028

Woodhead - Molex

CONN TERM BLK 90DEG DBL BARRIER

214

0387736402

0387736402

Woodhead - Molex

CONN TERM BLK COVER BLACK 2POS

0

0380020350

0380020350

Woodhead - Molex

CONN TERM BLK FLAT TAB BARRIER

15997

0380021335

0380021335

Woodhead - Molex

CONN TERM BLK 45DEG DBL BARRIER

60007000

2016066952

2016066952

Woodhead - Molex

CONN TERM BLK D RAIL ADAPT

0

0380021348

0380021348

Woodhead - Molex

CONN TERM BLK 90DEG BARRIER

7000

0380020329

0380020329

Woodhead - Molex

CONN TERM BLK FLAT DBL BARRIER

0

0387836402

0387836402

Woodhead - Molex

CONN TERM BLK COVER BLACK 2POS

440

0387836416

0387836416

Woodhead - Molex

CONN TERM BLK COVER BLACK 16POS

0

0387839412

0387839412

Woodhead - Molex

CONN TERM BLK COVER BLACK 12POS

0

0387536707

0387536707

Woodhead - Molex

CONN TERM BLK COVER BLACK 7POS

0

0387739402

0387739402

Woodhead - Molex

CONN TERM BLK COVER BLACK 2POS

0

0387536718

0387536718

Woodhead - Molex

CONN TERM BLK COVER BLACK 18POS

0

0387836411

0387836411

Woodhead - Molex

CONN TERM BLK COVER BLACK 11POS

0

0387536712

0387536712

Woodhead - Molex

CONN TERM BLK COVER BLACK 12POS

0

0387536703

0387536703

Woodhead - Molex

CONN TERM BLK COVER BLACK 3POS

0

0387236725

0387236725

Woodhead - Molex

CONN TERM BLK COVER BLACK 25POS

0

0380020169

0380020169

Woodhead - Molex

CONN TERM BLK 90DEG DBL BARRIER

7734

0387236712

0387236712

Woodhead - Molex

CONN TERM BLK COVER BLACK 12POS

0

0380010251

0380010251

Woodhead - Molex

CONN TERM BLK SCREW

0

Terminal Blocks - Accessories

1. Overview

Terminal Blocks Accessories are modular devices used to secure and manage electrical connections in various systems. They include components like terminal covers, marking strips, bridging pieces, and grounding terminals. These accessories enhance safety, improve connectivity reliability, and facilitate maintenance in electrical installations. With the rise of smart infrastructure and Industry 4.0, terminal blocks accessories have become critical in ensuring efficient power distribution and signal transmission across industries.

2. Main Types and Functional Classification

TypeFunctional FeaturesApplication Examples
Terminal CoversProtect against dust, moisture, and accidental contactIndustrial control panels
Marking StripsEnable circuit identification via labelingElectrical cabinets in HVAC systems
Bridging PiecesAllow parallel connections between adjacent terminalsPower distribution blocks
Grounding TerminalsProvide safe earthing paths for equipmentMachinery grounding systems
Fuse HoldersIntegrate circuit protection with terminal blocksControl circuits in renewable energy systems

3. Structure and Components

Typical terminal blocks accessories consist of: - Insulation Housing: Made from flame-retardant thermoplastics (e.g., PA66) - Conductive Elements: Brass or phosphor bronze contacts with tin/silver plating - Clamping Mechanism: Screw-type, spring-cage, or push-in connectors - Identification Features: Laser-markable surfaces or insertable labels - Mounting Base: DIN rail compatible or panel-mount designs

4. Key Technical Specifications

ParameterTypical RangeImportance
Rated Current1-300ADetermines power handling capacity
Rated Voltage50-1000VEnsures insulation safety
Contact Resistance<10m Affects connection efficiency
Insulation Resistance>100M Prevents leakage current
Operating Temperature-40 C to +120 CEnsures reliability in harsh environments
Short-Circuit Withstand10-100kACritical for industrial safety

5. Application Fields

Major industries include:

  • Industrial Automation: PLC control cabinets, motor drives
  • Energy Systems: Solar inverters, wind turbine controllers
  • Transportation: Rail vehicle electrical systems, EV charging stations
  • Telecom Infrastructure: Base station power distribution
  • Building Automation: HVAC control systems, smart lighting

Example: In smart grid substations, grounding terminals protect SCADA systems from surges.

6. Leading Manufacturers and Products

ManufacturerKey ProductsSpecial Features
Phoenix ContactPTFIX seriesModular plug-in system
Weidm llerSAM seriesTool-free connection technology
TE ConnectivityMini Universal seriesCompact 5.0mm pitch
Wago285 seriesCAGE CLAMP spring connection
OMRONV-terminal seriesVibration-resistant screw terminals

7. Selection Guide

Key considerations:

  1. Electrical Requirements: Match current/voltage ratings with system needs
  2. Environmental Factors: Consider temperature, humidity, and vibration
  3. Installation Type: DIN rail vs. PCB mounting
  4. Certifications: UL, CE, RoHS compliance
  5. Maintenance Needs: Choose between screw-type (high reliability) or push-in (fast installation)

Case Study: For outdoor wind turbine control cabinets, specify IP67-rated terminal covers with UV-resistant materials.

8. Industry Trends

Emerging trends include:

  • Miniaturization: 2.5mm pitch terminals for compact devices
  • Smart Integration: IoT-enabled terminals with condition monitoring
  • Modular Systems: Customizable blocks with tool-less assembly
  • Material Innovation: Halogen-free flame-retardant polymers
  • Global Standardization: Unified dimensions per IEC 60947-7

Market growth driven by EV charging infrastructure and renewable energy projects, projected at 6.2% CAGR through 2030.

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