Buyer takeaway
Clarify the connector requirement
Compare product and solution paths
Prepare RFQ details before quotation
Two different assurance functions
Connector position assurance and terminal position assurance address different assembly risks. One supports confirmation of connector mating; the other supports terminal retention inside the housing.
Connector position assurance
A CPA feature is associated with the mated connector interface. Its design can help prevent unintended release or indicate that the primary latch has reached the intended position.
Terminal position assurance
A TPA or secondary lock acts at the terminal cavities. It should only be engaged after terminals are fully inserted and helps control incomplete terminal seating during harness assembly.
Assembly review
The lock color, insertion direction and final position should be documented in work instructions. For equivalents, the housing, terminal and lock must be compared as one system.
RFQ and sample check
Provide photos of the primary latch and secondary lock, mating side, terminal reference and expected assembly method. During sample approval, confirm terminal pullback and full connector mating.
FAQ
Common questions
Common procurement and engineering questions related to this topic.
Are CPA and TPA the same connector part?
No. CPA relates to connector mating assurance, while TPA relates to terminal seating and retention inside the housing.
Should the secondary lock be closed before terminal insertion?
Assembly order depends on the connector design, but the lock generally must allow full terminal insertion before it reaches its final position. Follow the product drawing or assembly instruction.
