Motor connector temperature-rise selection starts with the complete connection and its application boundary. Terminal, housing, current, ambient, harness, and evidence inputs must remain tied to the controlled revision.

Contents

• Part 1. Define the thermal question
• Part 2. Identify terminal and housing inputs
• Part 3. Record current, ambient, and harness conditions
• Part 4. Separate evidence from a rating claim
• Part 5. Build a selection RFQ

Part 1. Define the thermal question

State whether the buyer is comparing a released connection, a sample, or an alternate. A temperature-rise question without a defined connection and requirement boundary is not a selection decision.

Part 2. Identify terminal and housing inputs

Record the connector, mating part, terminal population, housing, keying, and revision. A similar housing image cannot substitute for controlled drawings.

Important: Do not infer a current or temperature rating from a product image or visible terminal feature. Source: IPC.

Part 3. Record current, ambient, and harness conditions

Keep the stated current, ambient boundary, duty context, conductor arrangement, routing, and support conditions with the inquiry. These inputs explain what evidence a project must request.

Part 4. Separate evidence from a rating claim

Ask which configuration an evaluation covers and what conditions were recorded. A sample observation should not become a universal rating for an unlisted terminal, housing, or harness.

Part 5. Build a selection RFQ

RFQ field	Provide	Purpose
Connection	Drawings, mating part, terminal, housing, revision	Identify the configuration
Thermal boundary	Current, ambient, duty, harness arrangement	Define the question
Evidence request	Sample objective, records, open questions	Make review traceable
Change control	Alternate and revision expectations	Prevent silent scope expansion
## Part 6. Control revisions and use a ZUCH inquiry
A changed terminal, housing, route, current condition, or requirement can invalidate an earlier comparison. Use the ZUCH motor connectors route for product-family discovery, then send controlled inputs through the sample request route. See the vibration-retention checklist for a separate evidence lens.
## FAQ
### Is temperature rise a connector-only property?
No. It belongs to the complete connection, conditions, and evidence boundary.
### Which inputs should be identified first?
Identify connector, mating part, terminal, housing, revision, current, ambient, and harness context.
### Can a housing image prove a rating?
No. Appearance is not controlled rating evidence.
### Why record the harness arrangement?
It keeps the thermal question tied to the application rather than a loose component.
### When should a comparison be repeated?
Repeat it after a configuration, condition, requirement, or evidence-scope change.
### What belongs in the RFQ?
Send drawings and revision, current and ambient boundary, harness arrangement, sample objective, requested evidence, and change expectations.
## References
– IPC: interconnection documentation context.
– IEC: standards and application-evaluation context.