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Automotive relay: NO and NC describe different contacts

Publisher: ResumeMaker • 1 source

Published: 22 Oct 2026 13:13 · Updated: 22 Oct 2026 13:13

AI source check: 21 Oct 2026 12:40. This is not editorial approval.

In a few sentences

In brief

A similar housing does not mean uniform electrical behavior.

Useful to know

HELLA offers relays with normally open contacts and with a combination of normally open/normally closed contacts. NO and NC refer to the relay-free state. [1]

When selected, compare the scheme, rated voltage and allowable load, not just the number of feet. The same shape of the jack is not a sufficient basis for exchange. A relay is an electrical switching component; it is not a fuse that is selected by a completely different protective function. For the specific circuit, its scheme is used.

Sources

For further detail and to check the information:

  1. [1] HELLA — Relay contact configurations ↗