The electrical device to start and stop the motor safely will not require human intervention to control the machine to turn it on/off is Motor Starter (มอเตอร์ สตาร์ท เตอร์, which is the term in Thai). The additional feature you get with it is that it can provide low voltage and protection from the overflow current.
Fundamental functions that machine starters perform are to safely start/stop the motor and reverse the motor direction also protects from the overflow of the current and low voltage.
It is the formation of two components that work simultaneously to produce the desired output and protection to the motor. These two components are the Electrical Contractor and Overload protection circuit. The contractor serves the purpose is to switch on/off by creating a connection or breaking it between the terminals. The protection from any harm due to potential difference gets maintained by the Overload protection circuit.
There are several varieties available in these starters, but the primary classification you may find in the markets is:
- Manual Motor Starter generally gets operated manually. Their functioning is a simple and straightforward operation and does not require any expert help or intervention to make it work. It has a knob or a button that requires human input to turn it on/off. Some of the fundamental features that a manual device starter has that make it a preferable choice over other options are deliver a safe and budget-friendly operation. They have a compact size that makes them ideal for many applications and even for small spaces. It also protects the motor from any damage. They have an enormous variety of enclosures in the industry that you can choose from.
- Magnetic Motor Starter operates electromagnetically and has the feature to get started and stop by reading the current flow and voltage. There are two circuits available, and you may find them in the Magnetic starter, which is Power and Control circuit. The power circuit handles the functioning of switches which further transmits electricity throughout the path. The contractor controls the control circuit, which governs the flow of current to the motor. The control line strengthens the coil, which creates an electromagnetic field in the surrounding that lets the flow of current and completes the circuit. There are different types of Magnetic Starters available, and you can choose them depending on your brief requirements. These are Direct-On-Line Starter, Rotor Resistance Starter, and Stator Resistance Starter.