Choosing the right Terminal Blocks Connector for your application may be one of the most important interconnection choices to make in your vehicle or mobile equipment's design. The appropriate wire connectors can provide a reliable means to modularize, downsize, or improve manufacturability and field maintenance. There are several criteria to consider when selecting electrical interconnect components, including:
Current rating (current density)
Connector size (circuit density)
Configuration and circuit size
Price per circuit
Current rating is the most important criterion in the selection of electrical connectors. It is stated in amps per circuit and is a measure of the amount of current that can be passed through a mated terminal, which will give no more than an 85°F (30°C) temperature rise over ambient 72°F (22°C). This current level is then derated or adjusted for the number of circuits in a given housing due to the heat (temperature rise) of the adjacent terminals.
For example, a typical wire connector can carry up to 12 amps/circuit on a 2- or 3-circuit housing, but only 7.5 amps/circuit on a 12- or 15-circuit housing. Note that the current rating for a particular circuit size assumes all circuits of the housing are carrying the rated maximum current. The current rating also assumes that the maximum wire gauge for that connector family is used. For example, if a standard connector family has a maximum current rating of 12 amps/circuit, the use of 14 AWG wire is assumed. If a smaller China Connector Manufacturers’s wire is used, the maximum current carrying capacity should be derated by 1.0 to 1.5 amps/circuit for each AWG gauge range less than the maximum.