Electromagnetic contactors are designed for switching in electric circuits of direct and alternating voltage.
The climatic performance in which the contactor operates may be moderate, tropical and marine. However, it is not allowed to get liquid and dirt on this equipment.
Degree of protection of contactors, except for the terminals of coils and contacts-IP 40. KNE contactors are devices that double break the contact circuit using an electromagnet with direct current.
The main nodes of the contactor are the electromagnetic mechanism, the contact and arc suppression system, and also the system of blocking contacts. When the voltage is applied to the winding of the contactor electromagnet, its armature is attracted. As a result, the movable contact associated with the armature closes or opens the electrical circuit. In addition to the main contacts, designed for a large load, the contactor can have several auxiliary contacts designed for weak currents (block-contacts). As a rule, they are used to match the operation of the contactor with other devices or to include the contactor itself in the control circuit.
The contactors are delivered fully regulated and do not require additional adjustments. Before installing the contactors, it is necessary to check the presence of stamps, the absence of defects and the reliability of the fasteners. KNE contactors are fixed only on a flat plane. When starting contactors, noise is possible when the current is switched on and passed through them. The power supply and load are connected from different sides of the contactors.
The contactors are operated in accordance with the technical documentation.
The range of contactors is extremely wide. For example, industrial DC electric drives, uninterruptible power supplies, crane electric drives and traction electric drive of the railway transport. In addition, it is applied in oil, mining, mining, gas and drilling equipment.
The main parameters of contactors and starters are:
- rated current of main contacts
- breaking current limit
- Rated voltage
- mechanical wear resistance
- electrical wear resistance
- allowable number of inclusions per hour
- own switching time.