Should thermal switches be wired in series or in parallel with each other?

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Prepare for the Aircraft Maintenance Technician 40 OandP Exam. Practice with flashcards and multiple choice questions. Each question is accompanied by hints and explanations to support your learning. Ace your exam with confidence!

Multiple Choice

Should thermal switches be wired in series or in parallel with each other?

Explanation:
Thermal switches are protective devices that open a circuit when temperature exceeds a set point. When you have more than one switch for protection, wiring them in parallel gives independent, redundant protection paths. Each switch can trip if its area overheats, without relying on all other switches to stay closed. If they were in series, a single switch opening could interrupt the entire circuit and reduce reliability, potentially causing an unnecessary loss of protection. So parallel wiring is the preferred approach for multiple thermal switches.

Thermal switches are protective devices that open a circuit when temperature exceeds a set point. When you have more than one switch for protection, wiring them in parallel gives independent, redundant protection paths. Each switch can trip if its area overheats, without relying on all other switches to stay closed. If they were in series, a single switch opening could interrupt the entire circuit and reduce reliability, potentially causing an unnecessary loss of protection. So parallel wiring is the preferred approach for multiple thermal switches.

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