Electric switches
Electric switches
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Electrical switches are daily devices controlling electricity flow in a circuit by opening (breaking) or closing (connecting) an electrical path.
Types
Types
Toggle switch: Flips up or down to open or close a circuit.
Push button switch: Pressed to temporarily complete a circuit (momentary) or to toggle it on/off.
Rocker switch: Rocks back and forth to open or close the circuit.
Slide switch: Slides to connect or disconnect the circuit.
Rotary switch: Rotates to select between multiple circuits.
Centrifugal switch
Centrifugal switch
Pressure switch
Pressure switch
A pressure switch is an automatic switch opening/closing circuits based on fluid/gas pressure, monitoring pressure in a system and cause an action (e.g., turning a pump on/off) if pressure reaches a set threshold.
a selector switch
Selector switch
Selector switch
A selector switch is
They can be momentary contact or maintained.
momentary contact: a switch type or button closing/opening a circuit a function only at the duration of a user's interaction
Momentary switch
Momentary switch
[2] Momentary switch/Momentary contact turns on briefly if actuated.
Drum switch
Drum switch
[2], [4], [R1], [ A drum switch is a mechanical switch reversing a motor's direction, often for 1-phase and 3-phase motors.
Drum switches are often categorized in product of 3 for the switch's number of terminals OR connection points in how they manage motor windings (mainly in 3-phase systems) or split-phase configurations:
3-point drum switch or single-pole switch is basic on/off control (not common for reversing).
6-Point drum switch (Common for Reversing)
Used for single-phase motors (split-phase or capacitor-start).
of a 6-point drum switch refers to the number of terminals or connection points on the switch, which allows it to handle motor reversal by changing the wiring configuration.
6 terminals:
2 for power (L1/L2)
4 for motor windings (main + start winding reversal).
9-Point Drum Switch
Used for three-phase motor reversal (less common today).
Swaps two phases to reverse rotation.
Other variations
Some drum switches have 5 terminals (simplified single-phase).
Industrial versions may have more poles/contacts for complex control.
Configurations:
Configurations:
Single pole single throw (SPST): Controls one circuit: on/off.
Single pole double throw (SPDT): Switches between 2 outputs.
Double pole single throw (DPST): Controls 2 circuits simultaneously.
Double pole double throw (DPDT): Switches between 2 circuits sets.
Contacts
Contacts
[1]
a symbol for a normally open, momentary contact button, for a normally open, momentary contact button.
Operation of a normally open push button.
a normally closed, momentary contact button's symbol:
a normally closed push button's operation:
A symbol of a normally closed and open, momentary contact button.
This button maybe used for either/both functions.
This button has normally open and normally closed contacts
Combination push buttons is a single device integrating both NO and NC contacts in 1 unit, by the same button, often for control circuits for start/stop functions, safety interlocks, or mode selection.
Related pages
Related pages
[R1] Motor control center
[R2]
[R3]
References
References
Quizzes
[Q1]
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