Electrical switches can adapt to misunderstandings in the application / application to ensure no leakage current and make them available in multiple circuits, actuators, and housing styles. Disadvantages include their number, limited communication life cycle, large size and slow response.

Solid Switch

Solid switches electric appliances that do not have aging moving parts. They are able to switch quickly without any spark between contacts or problems with communication rust. Their disadvantages include high construction costs at current very high rates.

When selecting a level switch, the user needs to determine if the power circuit needs a switch that is usually open or closed.

Normally Open (NO)

The switches do not currently allow for free access. They need to “create” a contact in order to activate it.

Normally Closed (NC)

The switches currently allow free access and require a “break” contact (open) to be activated.

Stick / Throw

Most switches have one or two poles and one or two throws, but some manufacturers will produce custom-level switches for specialized apps. The number of poles indicates the number of different circuits that can be switched on at the same time.

The cast number describes the number of circuits each pole can control. This is indicated by a circuit configuration (NO / NC). Pause is a circuit breaker caused by contacts that are separated by a switch that introduces each circuit that opens or interrupts the circuit.

Electrical Changing System and Types

Single Pole, One Throw (SPST)

Single pole, single throw switches (SPST) make or break a single conductor connection in a single branch circuit. They usually have two terminals and are called single-pole switches

Single pole, Double Throw (SPDT)

A single pole, dual switches (SPDT) makes or breaks a single conductor connection with one of two conductors. They usually have three terminals and are usually used in pairs. SPDT switches are sometimes called three-way switches.

Double Pole, Single Throw (DPST)

Double pole, single throw switches (DPST) make or break the connection of two circuit conductors in a single branch circuit. They usually have six terminals and are available in both temporary and maintenance communication versions.

Double Pole, Double Throw (DPDT)

Double pole switches, double throw (DPDT) make or break the connection of two conductors in two different circuits. They usually have six terminals and are available in both temporary and maintenance communication versions.

If we wish to have a remote start and stop control of three-phase vehicles, we need a special relay with alternating cables large enough to safely drive the car flow over multiple start and stop cycles. The large, high-performance electromechanical transmission designed for this purpose is often referred to as industry contacts.

Schematic diagram

A schematic diagram of a three-phase connector connected to a third-phase vehicle (with overprotected fuses) is shown here:

The A1 and A2 power stations power the electromagnet coil, causing all three switch contacts to simultaneously shut off, transmitting three-phase AC power to the car. Re-energizing the coil causes it to de-magnetize, disassemble the weapon and enable the return spring inside the contact to touch all three contacts in the open (closed) area.

Example

The estimated 75 horsepower (480 volt AC 3-phase) power is shown here, both combined with the top cover removed to set three sets of high-power switch contacts:

Each phase connection is actually a pair of series of contacts that make and break simultaneously with the operation of the metal arm attracted by the electromagnet coil at the base of the communication assembly.

The main electrical terminals (L1-L3, T1-T3) in this contact hide two small screw terminals (commonly called A1 and A2) that provide connecting points to the electromagnet coil that transmits the contact:

Like most three-phase connectors, this coil is rated at 120 volts of AC. Although the electric car can operate in three phases, the 480 volt AC power, the communication coil and all other control cycles operate on low power for safety reasons.

Like all electromechanical transmissions, automotive contacts use a low-power signal to control high-voltage power lines.

This “amplification” action enables small control switches, in comparison, and transmission circuits to start and stop large (high-volume) electric motors.