Terminal Blocks - Accessories

Image Part Number Description / PDF Quantity Rfq
280-331

280-331

WAGO

END AND INTERMEDIATE PLATE; 2.5

300

280-316

280-316

WAGO

END AND INTERMEDIATE PLATE; 2.5

200

280-340

280-340

WAGO

END AND INTERMEDIATE PLATE; 2.5

200

280-309

280-309

WAGO

END AND INTERMEDIATE PLATE; 2.5

217

222-505

222-505

WAGO

STRAIN RELIEF PLATE; FOR MOUNTIN

310

2002-1292

2002-1292

WAGO

END AND INTERMEDIATE PLATE; 0.8

335

2002-1294

2002-1294

WAGO

SEPARATOR PLATE; 2 MM THICK; OVE

200

280-319

280-319

WAGO

END AND INTERMEDIATE PLATE; 1 MM

174

2004-1292

2004-1292

WAGO

END AND INTERMEDIATE PLATE; 1 MM

300

2002-3291

2002-3291

WAGO

END AND INTERMEDIATE PLATE; 0.8

168

2016-1291

2016-1291

WAGO

END AND INTERMEDIATE PLATE; 1 MM

167

280-315

280-315

WAGO

END AND INTERMEDIATE PLATE; 2.5

33

2010-1392

2010-1392

WAGO

END AND INTERMEDIATE PLATE; 1 MM

195

280-303

280-303

WAGO

END AND INTERMEDIATE PLATE; 2.5

300

280-324

280-324

WAGO

END AND INTERMEDIATE PLATE; 2.5

275

280-326

280-326

WAGO

END AND INTERMEDIATE PLATE; 2.5

275

280-313

280-313

WAGO

END AND INTERMEDIATE PLATE; 2.5

245

280-301

280-301

WAGO

END AND INTERMEDIATE PLATE; 2.5

300

249-116

249-116

WAGO

SCREWLESS END STOP; 6 MM WIDE; F

2820

280-314

280-314

WAGO

END AND INTERMEDIATE PLATE; 2.5

260

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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