What do SPST and SPDT in bus switches mean?

SPST and SPDT are abbreviation commonly used to describe switches. SPST is an abbreviation for Single-Pole Single-Throw, and Pole refers to the number of circuits that one switch can control "simultaneously". Throw also represents the number of outputs that can be switched.

Table-1 Function name of Bus switches

For example, SPDT is SP (Single pole) because one switch can control one circuit at a time, and DT (Double throw) because it can switch two outputs. (Table-1)

Table-1 Function name of Bus switches

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