Instant power outages with the simultaneous on of powerful equipment most often indicate that the 63-amp circuit breaker is selected incorrectly or the load exceeds its limiting capabilities. Understanding how much kilowatt can withstand 63AIt is critical for preventing fire hazards and wiring failure. In a single-phase 220-volt network, such a machine theoretically can withstand about 13.8 kW, but the real numbers depend on a variety of factors, including ambient temperature and installation quality.
When calculating the permissible load, you can not rely only on the nominal current indicated on the device body, ignoring the time-current characteristic. Automatic switch labeled C63 or D63 has different trigger thresholds of the thermal releaser, which directly affects the duration of operation under maximum load. If your shield is installed in a hot room or densely packed with other appliances, the real bandwidth can decrease by 10-15%, which will lead to false positives even at formally permissible values.
To accurately determine safe power, it is necessary to take into account not only the current strength, but also the power factor, as well as the nature of the load. Active loads, such as TENs or incandescent lamps, consume energy differently from the inductive loads represented by electric motors or compressors. That is why the answer to the question β63 amperes automatic machine how many kW holdsβ requires a differentiated approach for single-phase and three-phase networks, which will be discussed later.
Process physics and power calculation in a single-phase network
The basis for understanding the capacity of any switch-off This is Ohm's Law and power calculation formula for a single-phase network. In standard household conditions, where the voltage is 220 volts, the calculation is made by multiplying the current by the voltage. For a 63-amp machine, the basic calculation is as follows: 63A multiplied by 220V gives 13,860 watts or 13.86 kW. However, this is an idealized value that is rarely achieved in practice without loss.
The real picture is complicated by the fact that the voltage in the network is rarely stable and strictly equal to 220 volts. According to GOST, fluctuations within Β± 10% are permissible, which means a range of 198 to 242 volts. At the lower limit of voltage, the power that the 63A machine can transmit is reduced to 12.47 kW, while at the upper limit theoretically increases to 15.24 kW. It is important to understand that nominal The machine does not change, only the power transferred changes.
In addition, the power factor (cos Ο) should be considered, which for household appliances is often taken to be 0.95 or even 0.8 if there are many engines in the circuit. If you ignore this parameter, you can get an error in the calculations up to 20%. For purely active loads where the cos Ο is equal to one, the formula remains simple, but for complex consumers a correction factor must be introduced to ensure that the corrective factor is not used. switch-off It didn't work prematurely.
β οΈ Attention: Long-term operation of the machine at the limit of its nominal value (close to 63A) leads to heating of contacts and the body itself. This can cause insulation melting and false alarms of the heat releaser.
Load calculation for 380 volts three-phase network
In industrial settings or when connecting private homes with powerful equipment, a 380-volt three-phase network is often used. Here, the power calculation formula changes, as the root of three (approximately 1.73) must be taken into account. For the 63 amperes machine in the three-phase network, the design power is: 63 A Γ 380 V Γ 1.73 β 41.4 kW. This value is much higher than in the single-phase version, and allows you to connect serious equipment.
However, a uniform distribution of the load across all three phases is critical to stable operation. If you plug the entire load into just one phase, even with a total power below 41 kW, the phase skew will cause the current in one of the lines to exceed 63 amperes, and switch-off It'll work. Properly designed electricity grids require that consumers be divided into three roughly equal groups.
When calculating, it is also worth considering the starting currents of electric motors, which can be 5-7 times higher than the nominal current. The C or D machines are designed specifically to handle these surges without tripping immediately. If you use a machine with the characteristic βBβ for loads with large initiating currents, it will knock out at each start of the equipment, even if the operating power is within the normal range.
The effect of temperature on the operation of the machine
The ambient temperature directly affects the operation of the thermal disengagement. With an increase in temperature above +30 Β° C, the nominal current of the machine decreases. For example, at +40Β°C, the 63A machine may start to shut down at 58-59A. In a cold room (-5 Β° C), the trigger threshold, on the contrary, shifts upwards, which can be dangerous for wiring, since the machine will βsufferβ an overload that the cable will not withstand.
Time-current characteristics and types of machines
Not all 63-amp machines behave the same way under load. The key parameter is the time-current characteristic denoted by the Latin letters B, C or D before the numerical value of the denomination. Automatic type machines B They are triggered when the current is 3-5 times higher than the nominal value, which is suitable for networks without large initiation currents. Type CThe most common in everyday life, withstands short-term overloads of 5-10 times, which is ideal for mixed loads.
Type D It is designed to connect electric motors with heavy start and withstands overload 10-20 times from the nominal value for a short time. If you set a Type B machine on a line with a powerful pump or compressor, it will knock out every time it is turned on, although the power (kW) all converges. Therefore, when answering the question βAmperage 63 amperes how much kW holdsβ it is necessary to look not only at the amperage, but also at the letter index.
The response time also depends on the degree of overload. At a current of 1.13 from the nominal value (about 71 A for our case), the machine should not be turned off for an hour. At a current of 1.45 from the face value (about 91 A), he must break the chain within an hour (for automata up to 63 A) or two hours (for automata over 63 A). This thermal inertia allows you to experience short-term surges of voltage without de-energizing the house.
- π Type B: suitable for lighting and heating appliances, sensitive to initiating currents.
- βοΈ Type C: a universal option for rosette groups and mixed household load.
- π Type D: Designed for industrial equipment, pumps and machines with large initiation currents.
Dependence of the choice of the machine on the cable cross section
The main function of the circuit breaker is not to protect the load, but the cable. Therefore, the question of β63 amperes automatic machine how many kW holdsβ is secondary to the question of βwhat cable cross section will withstand 63 amperesβ. If you put the 63A machine on a thin wire, the cable will burn before the protection works. For copper cable, the minimum cross-section for current 63A is 10 mm2, and for aluminum cable 16 mm2.
Using a cable of smaller cross-section, for example, 6 mm2 copper, which can withstand about 40-50 amps for a long time, paired with a 63A machine is a grave mistake. In this case, the machine will assume that everything is fine until the insulation of the cable begins to melt, which can lead to a short circuit and fire. Cross-section of wire It must always match or exceed the capacity of the machine.
When laying a cable in boxes, pipes or bundles with other cables, its ability to remove heat is reduced. In such cases, it is necessary to apply reduction coefficients, which actually reduces the permissible load. If the cable is heated, its resistance increases, which leads to even more heating and loss of voltage on the site.
Table of correspondence of automatic machines, cable cross-section and power
For ease of choice of equipment and prevention of errors during installation, it is recommended to use reference data. Below is a table showing the relationship between the nominal value of the machine, the minimum cable cross section and the maximum power for single-phase and three-phase networks. These data are relevant for copper cables with PVC insulation laid in an open way.
| Score of the machine (A) | Cable cross-section (mm2), copper | Power (1 phase, 220V), kW | Power (3 phases, 380V), kW |
|---|---|---|---|
| 40 | 6 | 8.8 | 26.3 |
| 50 | 10 | 11.0 | 32.9 |
| 63 | 10 (16*) | 13.8 | 41.4 |
| 80 | 16 | 17.6 | 52.6 |
| 100 | 25 | 22.0 | 65.8 |
* For the 63A machine, it is recommended to use a 16 mm2 cable for safety margin, although 10 mm2 is the minimum current allowable.
Practical recommendations for installation and operation
When installing a 63-amp machine, it is necessary to ensure a high-quality connection of the cable veins with terminals. Insufficient tightening of the screws leads to oxidation of the contacts, heating and, as a result, to false shutdowns or melting of the body. It is recommended to use a dynamometer tool or regularly check the tightening of the screws after the first month of operation, since copper has the property of "leaking" under pressure.
It is also important to consider the number of devices simultaneously included. Even if the total power of all devices in the house is 20 kW, the probability of their simultaneous operation can be low. However, when installing the machine 63A for entering the apartment, you must be sure that the wiring inside the apartment and the junction boxes will withstand such current. Often the introductory machine is changed to a larger one, forgetting about the internal wiring, which is a direct road to a fire.
β οΈ Attention: It is strictly forbidden to replace the burned machine with a device with a large nominal value without checking the cable cross section. This violates the principle of selectivity and jeopardizes the security of the entire power grid.
βοΈ Pre-load check
Frequent errors in the calculation and selection of equipment
One of the most common mistakes is to add up the power of all appliances in the house without taking into account the simultaneity coefficient. The actual working load rarely reaches the sum of the power of all outlets. However, when calculating the input machine 63A, it is necessary to take into account the possibility of including powerful consumers: oven, boiler, washing machine and air conditioner at the same time.
Another mistake is to ignore the quality of the automatic switch itself. Cheap Chinese analogues can have a real trigger current, differing from the declared 20-30%. The machine marked 63A can knock at 50A or, conversely, hold 70A, overheating the wiring. Use of certified brands, such as ABB, Legrand or Schneider ElectricIt minimizes these risks.
Do not forget about the ageing of the wiring. In older homes, aluminum wiring loses its properties over time, becomes oxidized and becomes brittle. Installing a new powerful 63A machine into such a network can cause zero to burn off or fire at the twisting site. In such cases, modernization should begin with the replacement of the riser and indoor wiring.
Advice: When buying a machine, pay attention to the date of manufacture. Old stocks that have been in stock for more than 10 years may have altered mechanical parts and spring characteristics.
Conclusion and conclusion
The answer to the question β63 amperes automatic machine how many kW holdsβ depends on the type of network: for a single-phase 220V it is about 13.8 kW, and for a three-phase 380V β about 41.4 kW. However, these figures are the theoretical maximum, and it is recommended to lay a stock of 10-15% for safe operation. The key security factor remains the correspondence of the cable cross section to the nominal value of the machine.
The correct choice of the type of time-current characteristics (B, C, D) will avoid false positives when starting powerful engines. Remember that the automatic protects the cable, not the appliances, so its face value should always be less than or equal to the maximum allowable current for the wire cross section used.
β οΈ Attention: All work on the replacement of automatic machines and electrical wiring should be carried out by a qualified electrician in compliance with safety rules and disconnection of the voltage.
The main conclusion: the 63A is a serious device for heavy loads. Its installation requires mandatory inspection of the cross section of the inlet cable (minimum 10 mm2 of copper) and accounting of the initiation currents of the equipment.
Frequently Asked Questions (FAQ)
Can I use the 63A to protect the sockets?
No, it's strictly forbidden. Standard household outlets are designed for current up to 16A. The 63A machine will not work when the socket is overloaded, which will cause it to ignite. For the socket groups, automatic machines with a nominal value of 10A or 16A are used.
Why does the 63A machine heat up at 50A?
Heating can be caused by poor contact at the connection point of the wire and terminal, oxidation of contacts or work in high ambient temperatures. It is also possible to defect the device itself or mismatch the real load of the declared.
What cable is needed for a 63A machine in a wooden house?
In wooden houses, fire safety requirements are higher. It is recommended to use a cable with the index "ng-LS" (non-burning, low smoke emissions). The section should be at least 10 mm2 for copper, but it is better to lay 16 mm2 to reduce heat.
Will the machine hit 63A if you turn on welding?
This depends on the power of the welding machine and the type of machine. Household welding often gives large starting currents. If the machine has a βCβ or βDβ characteristic, it will most likely withstand a short-term start. The B-type machine can be activated instantly.
How to check if the 63A machine is working?
At home, you can only check the mechanics of the platoon and lever. Accurate verification of the time-current characteristics is carried out only in laboratories with the help of special testers (loading devices), supplying a controlled overload current.