is a device which is designed to interrupt the current flow in a circuit.

are physical switches, which must be activated physically, by moving, pressing, releasing, or touching its contacts.

do not require any physical contact in order to control a circuit. These are activated by semiconductor action

This is the basic ON and OF switch consisting of one input contact and one output contact.

This switch has three terminals is input contact and remaining two are output contacts. In most of the circuits, these switches are used as changeover to connect the input between two choices of outputs.

This switch consists of four terming Two input contacts and two output contacts. This type of switches is used for controlling two different circuits at a time. Also, the contacts of this switch may be either normally open or normally closed configurations.

This is a dual ON/OFF switch consisting of two ON positions. It has six terminals, two are input contact is and remaining four are the output contacts.

It is a momentary contact switch that Takes or breaks connection as long as pressure is applied (or when the button is pusned)

is manually actur (or pushed up or down) by a mechanical handle,lever or rocking mechanism. These are commonly used as light control switches.

The control schemes of a (blank) (blank) are shown in above figure, in which four varieties of (blank) (blank) are press Some switches are operated by the presence of an object or by the absence of objects or by the motion of machine instead of human hand operation.

are mainly used controlling DC and AC motor pumps according to the liquid or water in a tank or sump This switch is operated when the float (or floating object) moves downward or upward based on water level in a tank.

These switches are commonly usen industnal applications in order to sense the pressure of hydraulic systems and automatic devices.

are manually actuated control devices used mainly in portable control equipment.

These are used for connecting one line to one of many lines.

A transistor either allows the current to pass or it blocks the current as similar to working of normal switch.

It is most commonly used switching device is power electronic applications.

one of the most widely used high speed switching device for power control a, Stations.

switch is a vidirectional switching device, which is an equivalent circuit of two back to back SCRs connection with one gate terminal.

it consists of two terminals, which are not named as anode and cathode as it is a bidirectional device i.e., a DIAC can be operated in either direction regardless of the terminal identification.

are switches that open and close circuits electromechanically or electronically.

pic

Heavy-duty frame that contains and supports the parts of the relay.

Wire is wound around a metal core. The coil of wire causes an electromagnetic field.

A relays moving part. The armature opens and closes the contacts. An attached spring returns the armature to its original position.

The conducting part of the switch that makes (closes) or breaks (opens) a circuit.

.

b

consist of an input circuit, a control circuit, and an output circuit. The input circuit is the portion of a relays frame to which the control component is connected.

are electromechanical switches that are usually operated by a magnetic coil. They operate with AC or DC current, at common voltages such as 12V, 24V, 48V, 120V, and 230V and can control currents ranging from 2A-30A.

are a small, compact, fast operating switch design with one contact, normally open (NO), and metically sealed in a glass envelope, which makes the contacts unaffected by contaminants, fumes, or humidity.

are also operated by a magnetic coil. They are heavy-duty and are used to control starters and other industrial emponents.

turn on the load when the control (minimum operating) voltage is applied, and the voltage of the load is close to zero.

turn on the load immediately when the pickup voltage is present, and they allow i load to be turned on at any point in its up and down wave.

turn on the load when the control voltage is present, and the voltage of the Ioad is at its peak.

have an infinite number of possible output voltages within the relays rated range. They hale a built-in synchronizing circuit that controls the amount of output voltage as a function of the input voltage.

is a type of electromagnet, the purpose of which is to generate/controlled magnetic field through a coil wound into a tightly packed helix.

types of solenoids

types of solenoid