The trapezoidal connection method uses connectors with a trapezoidal mating design and insulation displacement contacts to provide secure, reliable, and efficient electrical connections in distribution boxes.

Overview of Trapezoidal Connectors

Trapezoidal connectors, such as the Series TMC-SK, are designed to terminate multiple conductors simultaneously without prior stripping of insulation. The insulation displacement contacts (IDC) cut through the insulation of flat ribbon cables, establishing a high-pressure electrical contact with the conductors, which ensures a reliable connection and reduces installation time . The trapezoidal shape on the mating side provides mechanical protection for the contact elements, preventing twisting and accidental human contact. When used with compatible housings, such as the ERNI Series KSG-185, the connectors can be securely locked using a screw system, ensuring a stable interface even in environments subject to vibration or movement .

Application in Distribution Boxes

In low-voltage distribution boxes, trapezoidal connectors are particularly useful for:

• Organizing multiple conductors efficiently, reducing wiring complexity.
• Ensuring reliable connections for busbars, neutral bars, and protective earth bars.
• Facilitating maintenance and modularity, as connectors can be easily mated or unmated without disturbing other circuits . The trapezoidal connection method is compatible with both screened and unscreened cables, and metallized connector housings are available for applications requiring electromagnetic shielding .

Advantages

1. Time Efficiency: Multiple conductors can be connected in a single step without stripping insulation.
2. Safety: The trapezoidal design protects against accidental contact and mechanical stress.
3. Reliability: High-pressure contact ensures low-resistance connections and reduces the risk of loose connections.
4. Flexibility: Suitable for modular distribution systems and can be integrated with standard DIN rail-mounted components .

Installation Considerations

• Ensure the connector is properly aligned with the mating housing before tightening screws.
• Verify that the ribbon cable or conductors are fully seated in the IDC slots.
• Use the integrated screw locking system to secure the connection and prevent accidental disconnection.
• For screened cables, select the metallized housing version to maintain shielding integrity . In summary, the trapezoidal connection method provides a robust, safe, and efficient solution for connecting multiple conductors in distribution boxes, improving both installation speed and long-term reliability.