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Dear electricians, when the total power of electrical appliances in the room is high, do you need to use the air switch of C63? The original C40 sometimes jumps, several times a night, but rarely all the big appliances are used together? Is it possible to jump even if there is a short circuit of electrical appliances? I've calculated that when the main switch C40 jumps, the total load of electrical appliances in the room will never exceed 5kW. Moreover, the air conditioner and electric water heater are controlled by C16 and C20 first. It's strange that these small air switches don't jump. They jump the main switch as soon as they jump. What's the matter?
Know the power of three-phase electricity, how to calculate how much air switch to use?
Calculate the load current, and then select the air switch according to the load current. The setting current of the air switch selected should be greater than the calculated load current (check the air switch product sample)
It is estimated that your power supply system is a 380V low-voltage distribution system. If the power factor is set to 0.8 temporarily, the calculation formula of load current is as follows:
Load current = power (kw) / 1.732/0.38/0.8 (a)
Three phase four wire total power consumption is 120 kilowatts. How big is the air switch
Three phase four wire has a ground wire. The total power consumption is 120 kilowatts. How large is the air switch? How many amps is the air switch?
If the three-phase calculation formula is 228a air switch, how do you calculate it? What is the calculation formula?
Three phase four wire 120kw power consumption, if the load distribution is balanced, the current of each phase is 181.82a, only 200A air switch is needed. If the load distribution is not so balanced, a slightly larger air switch can be considered
In fact, the calculation of three-phase current is the same as that of single-phase current. You can get the single-phase current by using the load △ 3 (three-phase) △ 220 (phase voltage). The current value marked on the air switch is the single-phase current value. That is to say, if there are three-phase air switches of 200A, then each circuit can withstand the rated current of 200A
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