What are the TPA and CPA of Connectors?

Connectors are indispensable components for connecting wiring harnesses to other electrical equipment. The TPA and CPA of connectors are mainly used to fix the positions of terminals and connectors.

CPA, plastic case secondary locking mechanism, Connector Position Assurance. Its function is to ensure that the buckle of the primary locking mechanism will not be easily withdrawn after the plastic case and electrical interface are assembled in place. Due to its special functions, the CPA must ensure the operability and legibility of workers when designing. This requires that the CPA must be an independent mechanism on the plastic shell and must also have a special color mark.

TPA, terminal secondary locking structure, Terminal Position Assurance. Not all terminals require secondary locking structures. The public requirement is that TPA should be used when the terminal width is less than 2.8mm (including 2.8). In order to ensure easy installation by workers in the wiring harness factory, the color of TPA must also be identifiable, and the TPA must have a clear feel during assembly. In order to ensure that the TPA will not automatically enter the locking position when the plastic case is transported to the wiring harness factory, an anti-locking mechanism is necessary on the TPA.

TPA and CPA of connectors