Answer
Apr 27, 2026 - 07:43 AM
SP stands for Single Pole, DP stands for Double Pole.
ST stands for Single Throw, DP stands for Double Throw.
ST stands for Single Throw, DP stands for Double Throw.
SPST (Single Pole Single Throw): Single Pole means it controls one circuit (the most common). Single Throw means it can just be ON or OFF
DPDT (Double Pole Double Throw): DP means it can control two separate circuits. Double Throw means there are two ON options for each. These kind of switches are often used to reverse the direction of a motor so you can have it go UP, DOWN or be OFF
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