What Are The Common Specifications For Bimetallic Terminal Blocks?
Common specifications of bimetallic terminal blocks primarily include cross-sectional areas ranging from 16 mm² to 630 mm², bolt hole sizes from M8 to M20, and voltage ratings up to 36 kV. These components ensure secure transitions between copper and aluminum conductors, preventing galvanic corrosion in electrical systems.
Standard Dimensions and Sizing Options
Conductor Cross-Sectional Range
Standard industrial applications utilize a specific bi metal cable lug size to match specific conductor diameters. The most frequent specifications cover small-scale 16 mm², 25 mm², and 35 mm² lines, extending up to heavy-duty 400 mm², 500 mm², and 630 mm² configurations.
| Specification (mm²) | Palm Hole Diameter (mm) | Rated Current Range (A) |
|---|---|---|
| 50 | 10.5 (M10) | 150 - 200 |
| 120 | 13.0 (M12) | 300 - 380 |
| 240 | 14.5 (M14) | 500 - 600 |
| 400 | 17.0 (M16) | 750 - 850 |
Mechanical Parameters
Bolt Hole Diameters and Voltage Limits
The connecting palm of bimetallic lugs features distinct hole diameters tailored for standard metric bolts. These variations allow precise mounting on busbars. Additionally, high-quality bi metal lugs connectors support medium to high voltage applications, typically operating efficiently under 11 kV, 22 kV, or 36 kV limits depending on the barrel insulation and spacing.
Production and Material Standards
The manufacturing process involves friction welding to fuse 99.5% pure aluminum barrels with 99.9% pure copper palms. Standard specifications mandate specific barrel lengths and wall thicknesses to withstand crimping forces. Compliance with international testing standards like IEC 61238-1 ensures these components handle mechanical stress and thermal cycling during operation.
