Contents
What is the symbol of a contactor?
The contactor is designated as K and, in the coil symbol, the K1/4 indicates that there are four associated contacts. Sometimes the coil designation is placed beside the coil symbol. In this case there are three normally open power contacts, and one normally open control contact.
What is the symbol for a normally open contact?
There are four basic symbols: normally open (NO), normally closed (NC), normally open held closed (NOHC), and normally closed held open (NCHO). To understand how these switches are drawn, it is necessary to begin with how normally open and normally closed switches are drawn, FIG.
What are the terminals on a contactor?
The contactor terminals for connection of the motor leads are almost always marked T1, T2, and so on. Many contactor manufacturers use the designations A1 and A2 for the terminals that connect power to the magnetic coil. Auxiliary contacts are operated by the magnetic coil just like the main contacts.
What are the three main parts in the electromagnetic contactor?
A contactor has three components. The contacts are the current-carrying part of the contactor. This includes power contacts, auxiliary contacts, and contact springs. The electromagnet (or “coil”) provides the driving force to close the contacts.
What does T1 and T2 mean on a contactor?
T1 = Tap 1. T2 = Tap 2. T3 = Tap 3 (of a Transformer secondary winding on the output reduced Voltage side)
What is the definition overload?
Definition of overload (Entry 1 of 2) transitive verb. : to load (something or someone) to excess: such as. a : to put too large a load on or in (something) overload a ship overload a washing machine Overloading the trailer poses a safety risk. …
What is the function of contactor?
Contactors are used by electrical equipment that is frequently turned off and on with the opening and closing of a circuit. The function of the contactor is to make and break all power supply lines running to a Load or to repeatedly establish and interrupt an electrical power circuit.
What is inside contactor?
A contactor has three components. The contacts are the current-carrying part of the contactor. This includes power contacts, auxiliary contacts, and contact springs.
What is the function of a contactor in an electrical circuit?
Therefore, the function of the contactor is to switch an electrical circuit on or off. Overloading of the circuit can be prevented by adding an thermal overload relay. To deactivate, the contactor can be pulled out of the parent device in which it’s embedded and operating.
What are the three major parts of a contactor or relay?
There are three major parts of a contactor or relay: the coil, mechanical linkage and contacts. The coil is used to create a magnetic field and is rated based on voltage (24 V, 120 V, 208/204 V, 480 V). The mechanical linkage connects the armature to the contacts when the coil is energized, completing the circuit.