SPSTNO
SPSTNO stands for single-pole, single-throw normally open. It refers to a switch configuration with one circuit path (pole) and one contact path (throw). In the resting state the contacts are open, so no current flows; actuation closes the contacts to complete the circuit.
Mechanical SPSTNO switches achieve closure by an actuator such as a pushbutton, toggle, or lever. The arrangement
SPSTNO switches are used for basic on/off control of a single circuit. They are common in consumer
Ratings and characteristics vary widely by device. Specifications typically include nominal voltage and current, contact resistance
Compared with SPST-NC (normally closed), the SPST-NO provides default off behavior. Related configurations include SPDT (single-pole