JMP Switches are available with a number of different terminal variations including single-pole, double throw (SPDT); single-pole, single throw – normally open (SPNO); or single-pole, single throw – normally closed (SPNC). Our standard JMP snap action switches are SPDT allowing the user to configure how they would like the circuit to operate. We offer the custom SPNO or SPNC feature for original equipment manufacturers making the installation easy during assembly.
For more information about the switch’s circuits, continue reading below. To purchase a standard snap action switch, click here.
SINGLE-POLE, DOUBLE THROW switch (spdt)
Our standard snap action switches are a SPDT configuration giving users the option of wiring either normally open or normally closed.
SINGLE-POLE, single throw – normally open (spno)
If a snap action switch is SPNO that means the circuit is normally incomplete, and the device or system it is connected to is normally off unless the switch is activated. For example, in a pressure release system of an air duct the system is off – normally open. Once the sail actuator of the snap action switch detects pressure, or air flow, the plunger is pressed changing the circuit to active the pressure release system.
SINGLE-POLE, single throw – normally closed (spnc)
Likewise, if a snap action switch is SPNC the circuit is normally complete and the device or system is active until the switch’s circuit changes states. Our snap action float switches are commonly used in a dehumidifier drip pan. Once the styrene float actuator detects that water reaches a certain level, the plunger is depressed changing the switch’s circuit turning the dehumidifier off.
For more information about our snap action switches or a custom switching solution, contact us!