Which of the following is categorized as a single pole-single throw?

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Multiple Choice

Which of the following is categorized as a single pole-single throw?

Single pole-single throw is a simple on/off switch with one conducting path between two terminals. The magnetic reed switch fits this exactly: inside a sealed package are two reeds that close together to complete a single electrical path when a magnetic field is present. That creates one pole that can either connect (throw closed) or disconnect (throw open) the circuit. The other options are sensing devices or switches that don’t present just a single two-terminal on/off contact in their basic form, so they aren’t SPST.

Single pole-single throw is a simple on/off switch with one conducting path between two terminals. The magnetic reed switch fits this exactly: inside a sealed package are two reeds that close together to complete a single electrical path when a magnetic field is present. That creates one pole that can either connect (throw closed) or disconnect (throw open) the circuit. The other options are sensing devices or switches that don’t present just a single two-terminal on/off contact in their basic form, so they aren’t SPST.

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