4 pin 7122-8345 MG620397 plastic housing plug auto crimp wiring harness connector 2.0 Series

Let's briefly explain the design process of the car beam.

1. The design process of the schematic diagram

① Draw the electrical appliances schematic diagram according to the electrical configuration and technical requirements required by the "Electrical Design Mission".

② Determine the melting capacity and wire diameter according to the power of each electrical appliance, and the load distribution of each electrical factor system to determine the capacity of the total melting.

③ Calculate the wire diameter according to the following formula.

I = p/u, A = IρL/Ud (18-1)

In the formula, i is current (A); P is the power of the electrical component (W); u is voltage (V); A is a wire diameter (MM2); The length of the wires (m); UD is the maximum voltage reduction loss.

At the same time, the following situation must be considered:

① If the wire is too long, you can enlarge the wire diameter appropriately.

② The wire is connected to the use of electrical appliances after multiple plug -in connections. Considering that the terminal voltage drop is large, the wire diameter can be enlarged appropriately.

③ Different forms of wires have different allowable current and line voltage drops.

Simple instructions：

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