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AC contactor or DC contactor are different
PUBLISHER:Shanghai Moye Electric Co.,Ltd””RELEASE TIME:2017/7/13
AC contactor and DC contactor of the main differences are the following:
1, arc extinguishing device
AC contactor contacts generated between the arc in the current zero when the natural extinguish, and the DC arc does not exist in this natural zero-crossing, can only rely on the elongated arc and cooling arc to arc. Therefore, under the same electrical parameters, it is much more difficult to extinguish the DC arc than to extinguish the AC arc, so the DC contactor's arc extinguishing device is generally more complicated than the arc extinguishing device of the AC contactor. DC contactor generally use magnetic blow-off arc device with other arc extinguishing method.
2, contact system
AC contactors are mostly double breakpoint bridge contacts, and the larger current DC contactor with rolling contact finger contact. Moving, static contact in the process of closing a sliding process to extend the service life.
3, contactor magnetic system coil used in different types of power.
AC contactor to attract coil power supply for the exchange, and DC contactor to attract more than the use of DC coil coil. But this is not absolute, and now there are many AC contactor solenoid coil is a DC coil, through the rectification of the AC power into DC; DC contactor with the use of AC coil is rare, but there are such products.
Know the difference between AC contactor and DC contactor, DC circuit should be used in the DC contactor. Of course, when the DC load capacity is small, you can also use the AC contactor to control the DC load, but the AC contactor rated current should be selected larger.
The main difference between DC circuit breakers and AC circuit breakers is the ability to extinguish arcs.
Because the exchange of each cycle have zero, in the zero-crossing is easy to arc, and DC switch is not zero, arc quenching capacity is poor, so to add additional arc device. In general, it is difficult to die DC, and the exchange of zero, easy to arc. A large AC circuit breaker can be used instead of a small DC circuit breaker. DC relays and AC relays why can not replace the iron core is not the same - to add
In order to prevent the core in the AC magnetic field in the eddy current, AC relay (including AC contactor) is the silicon core stack, and the transformer core almost. DC relay does not exist eddy current problem, the core can be made of monolithic electric iron and other soft magnetic materials. If the DC relay core will be due to eddy current and heat, can not work properly, and may burn the coil. AC relay AC impedance is very large and DC group is very small. If the AC relay is connected to DC, the AC impedance does not work for DC, and a small DC group can cause a large current to burn the coil. In order to prevent the core in the AC magnetic field in the eddy current, AC relay (including AC contactor) is the silicon core stack, and the transformer core almost. DC relay does not exist eddy current problem, the core can be made of monolithic electric iron and other soft magnetic materials. If the DC relay connected to the AC, the core will be due to eddy current and heat, can not work properly, and may burn the coil.
AC power to commutation, DC relay used in the AC circuit even if it can be sucked and will produce a lot of noise, in order to suppress the vibration and noise in the AC relay on the core with short-circuit ring, DC relay in order to ensure adequate ampere turns The core is more than the AC relay for the slender, which is the difference between the two
1, DC relay only impedance, so the coil DC resistance value is larger;
2, AC relay both impedance, and inductance, that is, the coil in the AC circuit generated by the impedance, the sense of resistance to the bulk. If the AC relay to be used in the DC circuit, can be connected in the relay after a string of resistance; and the same voltage DC
The relay can not be engaged in the AC circuit. DC power is more likely to produce the arc of the two different applications, the control circuit of the power supply is different. AC on the surrounding equipment with electromagnetic interference, if not required, choose the exchange price to teach cheap. AC-DC relay is different, mainly in the AC relay A circle of copper, that circle is to eliminate the jitter caused by the exchange, the DC relay if connected to the AC, unless it is not 50 or 60Hz, and much higher than the frequency, otherwise the relay will shake, also issued a sound.
The copper ring is located at one end of the armature, close to the bobbin, and the boom on the same side.
The principle I forgot, but it does have this distinction, can not mix.
AC relay AC impedance is very large and DC group is very small. If the AC relay is connected to DC, the AC impedance does not work for DC, and a small DC group can cause a large current to burn the coil.
1, arc extinguishing device
AC contactor contacts generated between the arc in the current zero when the natural extinguish, and the DC arc does not exist in this natural zero-crossing, can only rely on the elongated arc and cooling arc to arc. Therefore, under the same electrical parameters, it is much more difficult to extinguish the DC arc than to extinguish the AC arc, so the DC contactor's arc extinguishing device is generally more complicated than the arc extinguishing device of the AC contactor. DC contactor generally use magnetic blow-off arc device with other arc extinguishing method.
2, contact system
AC contactors are mostly double breakpoint bridge contacts, and the larger current DC contactor with rolling contact finger contact. Moving, static contact in the process of closing a sliding process to extend the service life.
3, contactor magnetic system coil used in different types of power.
AC contactor to attract coil power supply for the exchange, and DC contactor to attract more than the use of DC coil coil. But this is not absolute, and now there are many AC contactor solenoid coil is a DC coil, through the rectification of the AC power into DC; DC contactor with the use of AC coil is rare, but there are such products.
Know the difference between AC contactor and DC contactor, DC circuit should be used in the DC contactor. Of course, when the DC load capacity is small, you can also use the AC contactor to control the DC load, but the AC contactor rated current should be selected larger.
The main difference between DC circuit breakers and AC circuit breakers is the ability to extinguish arcs.
Because the exchange of each cycle have zero, in the zero-crossing is easy to arc, and DC switch is not zero, arc quenching capacity is poor, so to add additional arc device. In general, it is difficult to die DC, and the exchange of zero, easy to arc. A large AC circuit breaker can be used instead of a small DC circuit breaker. DC relays and AC relays why can not replace the iron core is not the same - to add
In order to prevent the core in the AC magnetic field in the eddy current, AC relay (including AC contactor) is the silicon core stack, and the transformer core almost. DC relay does not exist eddy current problem, the core can be made of monolithic electric iron and other soft magnetic materials. If the DC relay core will be due to eddy current and heat, can not work properly, and may burn the coil. AC relay AC impedance is very large and DC group is very small. If the AC relay is connected to DC, the AC impedance does not work for DC, and a small DC group can cause a large current to burn the coil. In order to prevent the core in the AC magnetic field in the eddy current, AC relay (including AC contactor) is the silicon core stack, and the transformer core almost. DC relay does not exist eddy current problem, the core can be made of monolithic electric iron and other soft magnetic materials. If the DC relay connected to the AC, the core will be due to eddy current and heat, can not work properly, and may burn the coil.
AC power to commutation, DC relay used in the AC circuit even if it can be sucked and will produce a lot of noise, in order to suppress the vibration and noise in the AC relay on the core with short-circuit ring, DC relay in order to ensure adequate ampere turns The core is more than the AC relay for the slender, which is the difference between the two
1, DC relay only impedance, so the coil DC resistance value is larger;
2, AC relay both impedance, and inductance, that is, the coil in the AC circuit generated by the impedance, the sense of resistance to the bulk. If the AC relay to be used in the DC circuit, can be connected in the relay after a string of resistance; and the same voltage DC
The relay can not be engaged in the AC circuit. DC power is more likely to produce the arc of the two different applications, the control circuit of the power supply is different. AC on the surrounding equipment with electromagnetic interference, if not required, choose the exchange price to teach cheap. AC-DC relay is different, mainly in the AC relay A circle of copper, that circle is to eliminate the jitter caused by the exchange, the DC relay if connected to the AC, unless it is not 50 or 60Hz, and much higher than the frequency, otherwise the relay will shake, also issued a sound.
The copper ring is located at one end of the armature, close to the bobbin, and the boom on the same side.
The principle I forgot, but it does have this distinction, can not mix.
AC relay AC impedance is very large and DC group is very small. If the AC relay is connected to DC, the AC impedance does not work for DC, and a small DC group can cause a large current to burn the coil.