- What is a single pole double throw (SPDT) switch?
- Single pole double throw switches feed power from a single source into two separate circuits. The break-before-make action can be actuated using a toggle, button, or in the case of the products above, a pressure sensor; triggering a change in circuit one a pre-set pressure is detected.
- Where is a SPDT switch used?
SPDT switches are used in any circuit (or circuits) where one switch is required to power conflicting actions. In some cases, it may be used as an on/off switch, but they are more suited to switching between circuits that do not need to run at the same time. For example, to switch between power sources (with a momentary lapse in power as the circuit breaks), or to switch equipment between “standby” mode and “active” mode.
The precise implications of this vary according to the circuit composition, but SPDT switches are commonly found in domestic appliances, the automotive industry and heavy equipment, as a safety feature.
- How does a single pole double throw switch work?
A single pole double throw switch is a break-before-make changeover switch; connecting a common source to a normally closed (NC) port, or a normally open (NO) port. Whether using a toggle, a timer, a button or a pressure sensor, the two circuits are isolated from each other until the switch is actuated.
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