A slide switch is a bistable two-position switch utilized to control the current flow in a circuit. It can be closed or adjusted by moving the switch. A slide switch can also be utilized to connect two more circuits to a current one and to connect them optionally. For the latter configuration, a single pole double throw is used. The double pole double throw configurations work the same way as two combined Single pole single throw configurations.
A slide switch is also known as a maintained switch which means that it remains in the same position until it is actuated into a new state, where it remains until it is actuated again, and so on. They come in three main sizes: miniature, subminiature, and standard.
Specifications
Pole and Throw Configurations
Pole and throw configurations for slide switches are similar to push-button switches. Most of the slide switches are of single pole double throw configurations. SPDT switches usually have three terminals: one common pin and two pins competing to connect with the common one. They are effectively utilized for selecting between two power sources and changing outputs. Another common pole configuration for these switches is Double pole double throw. The common terminal is usually in the center, and the two privileged positions are placed externally.
Mounting
There is a wide range of terminal types for slide switches. Models include feed-through style, wire leads, solder terminals, screw terminals, quick interface or edge terminals, surface mount technology (SMT), and panel mount switches.
SMT switches are more modest than feed-through switches. They sit level on top of a PCB and require a delicate touch. They are not intended to support as much switching force as a feed-through switch.
Panel mount switches are intended to sit outside a casing to offer assurance to the slide switch. Slide switch sizes are generally portrayed as subminiature, miniature, and standard.
Electrical Specifications
Electrical specifications for such switches include maximum AC voltages, maximum current rating, maximum DC voltage, and maximum mechanical life.
Maximum Current Rating
Maximum current rating is the amount of current that can run down the switch at one time. A switch consists of very little resistance between the contacts, and because of such small resistance, all switches are rated for the most amount of current they can withstand. If that amount is exceeded, the switch will overheat and cause it to melt or create smoke.
Maximum AC/DC Voltage
Maximum AC/DC voltage is the amount of current a switch can handle at one time without getting damaged.
Maximum Mechanical Life
Maximum mechanical life is the life expectancy of a switch. Sometimes a switch’s electrical life expectancy can be less than its mechanical life.
Features
Slide switches have many features that make them suitable for various applications.
Pilot Lights:
These are the lights that are used to indicate or signal that the circuit is active at the moment. This lets users tell whether the switch is ON by looking at the light.
Illuminated Switches:
These switches feature an integrated lamp that signifies a connection to a powered circuit.
Wiping Contacts:
These contacts are usually self-cleaning and have low resistance. However, wiping contact has a drawback; wiping can often create mechanical wear.
Time Delays:
This allows the switches to turn a load OFF at a predetermined time interval.
