Sealed NO NC SPDT 220V AC Relay 30A NB90E-AC220V-S-C Long Life

AC Power Relay Description:

New energy products, like electric vehicles, must be a trend in the next few days. So more and more fast-charging stations are made and satisfy the need for electric cars power-charging.NB90 series AC relay is specially applied to the charging point. It is a high switching capacity for contacts, is a dust-proof or sealed type option, and is environmentally friendly.

AC Power Relay Features:

1. 2500VAC for dielectric withstand voltage between contact and coil

2. Class F for coil insulation grade

3. Sealed-type

4. SPDT

5. 900mW or 600mW for option

6.TUV/CQC/UL certification

The structure of the AC relay:

The coil of the AC relay is short and the wire diameter is thicker, mainly because the reactance of the coil is larger after the coil is supplied with alternating current, and the thicker wire diameter can reduce the internal resistance and reduce the heat generation. In addition, when the alternating current crosses zero, the coil electromagnetic force will be reduced, the suction is not strong, and vibration occurs, so a short-circuit ring is added to the part of the magnet suction surface. When the magnetic field changes, an eddy current is formed in the short-circuit ring, and then an electromagnetic force opposite to the magnetic field change direction is formed, which lags behind the magnetic field change., so that the electromagnet can be better attracted.

The difference between a DC relay and an AC relay

The working principles of DC relays and AC relays are the same based on electromagnetic principles, but the power supply of DC relays must be DC, and the power supply of AC relays must be AC ​​power. The DC resistance of the DC relay coil is very large, and the coil current is equal to the voltage divided by the DC resistance of the coil, so the coil wire is thin and has many turns. The number of turns of the AC relay coil is relatively small because the limiting current in the AC circuit is mainly the coil inductance except for the coil resistance. The size of the inductance xl is proportional to the frequency of the AC. If the AC relay is connected to the DC circuit because the frequency of the direct current is equal to zero, the inductive reactance XL=0 and the internal resistance of the coil is very small, so the coil will heat up and burn out. On the contrary, when the DC relay is connected to the AC power supply, the internal resistance of the coil and the large inductive reactance will cause the coil to fail to close, so it cannot be interchanged.

1. Using under a clean environment(excluding H2S, SO2, NO2, dust contaminants), dust-proof type is recommended using under a polluted environment(containing H2S, SO2, NO2, dust contaminants), sealed type is recommended, and please contact us during practical application；

2. When assembly on PCB, it needs to be completely washed, please inform us before ordering, so as to provide the proper types;

3. If the dielectric strength between the coil & contacts has to be over 2500VAC, please inform us before ordering, so as to provide the proper types.

4. Avoid using it under strong magnetic or shock extremes conditions, or the technical rating will be changed.

AC Power Relay Specification: