What is the difference between the application of the relay KA and the KM?
Medium / large-capacity DC contactors often use a single breakpoint plane layout of the overall structure, which is characterized by breaking arc distance is long, with anti-arc muffler cover. Small capacity DC contactor with double break point three-dimensional layout structure. Vacuum contactor: Vacuum contactor (LC1-V *) The component is similar to the general air contactor, except that the contact of the vacuum contactor is sealed in the vacuum interrupter. It is characterized by high on / off current, rated operating voltage is high. Semiconductor contactor: the main products such as two-way thyristor, which is characterized by no moving part, long life, fast action, free from explosions, dust, harmful gases, impact shock
The main difference from the contactor is that the main contact of the contactor can pass through the high current and the contact of the intermediate relay can only pass through the small current. Therefore, it can only be used in the control circuit. The KM contactor is used to turn on and off the load. It is combined with a thermal overload relay to protect the electrical equipment in operation. It is combined with the relay control circuit, remote control or interlock related electrical equipment. AC contactor: The typical structure is divided into double breakpoint direct drive (LC1-D / F *) and single break (LC1-B *). The former is compact, small size, light weight; the latter easy to maintain, easy to configure the unipolar, secondary and multi-pole structure, but the volume and installation area. DC contactor: its action principle and AC contactor similar, but the DC breakdown of the magnetic load stored in the magnetic field instantaneous release, breakpoint generated by high-energy arc, so the DC contactor has a certain arc function.
KA is generally an intermediate relay. KM or K represents a contactor. KA is a special contactor (ie switch). It is 4 to pay off the angle of contact, the following is 4 pay normally open angle contact, when the coil power, the use of electromagnetic force to move the * iron pull down, so that the above 4 pay closed angle contact, Normally open angle contact closed. It is used to pass the intermediate signal in the control circuit. The structure and principle of the intermediate relay are basically the same as those of the AC contactor.
