Our company "Yug-Service" (Rostov-on-Don) is engaged in wholesale and retail supplies of various products related to LED lighting. In the catalog you will find circuit breakers from the Italian brand Legrand, as well as miniature surge protection modules. Automatic machines (type C) differ in current strength - from 10 to 63 Amperes. Protection modules are designed for voltages up to 1.2 kV.
Switches with surge protection
We offer Legrand MCB circuit breakers (type C) in six modifications: 10 A, 16 A, 25 A, 32 A, 40 A and 63 A. These devices provide reliable protection of electrical equipment from voltage surges, line overloads and other emerging problems . In addition, circuit breakers (type C) provide effective protection of humans from high voltage.
Protection modules are manufactured in South Korea and are intended for lighting equipment. They protect lamps of various types from voltage surges. The maximum lamp power is 15 W.
Type C modules and circuit breakers
Our company sells Italian circuit breakers (type C) only in wholesale, modules - retail sale is possible, wholesale starts from 10 units. High quality products from trusted manufacturers are offered at very competitive prices. A detailed description of the products is posted on the website, or you can consult our employees. They have an excellent knowledge of the range and are always ready to help you make a choice and purchase the best electrical equipment. We work throughout the Russian Federation, and also supply goods to the CIS countries.
Modular circuit breakers are used to protect low-current and signal circuits from overloads and short circuits. They are made one-, two-, three- and four-pole, installed on DIN rails in electrical panels. In everyday life, they actually act as automatic traffic jams.
Selection parameters for modular circuit breakers
The price of modular AVs depends on the design, dimensions and technical parameters.
Rated voltage. Depends on the insulation resistance of the housing material.
Rated current. Should slightly exceed the rated load current. If there is excess “reserve”, the machine will not work at the moment of overload. The calculation is also made taking into account the cross-section of the conductors. The thin wire gets hot. If In of the switch is greater than the permissible I for conductors, they will burn out, but the machine will not trip.
Breaking capacity. This is the highest short circuit overcurrent at which the switch opens the circuit and is not destroyed. The higher the indicator, the better, but the prices for “automatic traffic jams” with a large shutdown capacity are quite high.
Time-current response characteristics. Inrush currents of equipment under the influence of transient processes far exceed the rated ones. To prevent the machines from tripping during short-term triggering current, they are produced in several types:
B. Only for active loads (lamps, electric ovens, irons);
C. For home and offices (refrigerators, washing machines, computers);
D. For networks with significant reactive load (powerful electric motors).
The ABC-Electro online store offers you to buy modular circuit breakers at an affordable price. On the website you can view the catalog, which shows the current cost of the product, and place an order. If you have questions about the assortment or delivery conditions, our managers will promptly answer them by calling the hotline.
Not every manufacturer lists inrush currents for luminaires in their catalogue.
The catalog of the SLICK.PRS ECO LED 45 5000K lamp indicates a starting current of 35 A. The lamp power is indicated at 42 W.
Recently on my channel youtube There was a video where I gave an example of how I would do task lighting. I was hoping that they would ask me, what about the starting currents, won’t the C6 automatic machine work? For some reason no one paid attention to this.
The fact is that now I will try to prove to you that in most cases you can ignore the inrush currents of LED lamps.
When choosing a circuit breaker, it is important to know not only the operating current, but also the starting current. But, even if you know the starting current, this does not mean that you can choose the right protective device. The duration of the starting current is very important.
Since I did not find the duration of the starting current in the catalog, I asked the manufacturer a question.
On the same day I received a response:
As you can see, the starting current of this lamp is only 3 μs. In my opinion, the duration of the inrush current for all lamps will be approximately the same.
Let's do some math and justify everything with numbers.
Estimated current for 50 lamps: 0.2*50=10 A.
Starting current of one lamp: 35 A.
Starting current for 50 lamps: 50*35=1750 A.
Let's choose a circuit breaker with characteristic C16.
Ratio of starting current to rated current of the circuit breaker: 1750/16=110.
Let's determine what the duration of this starting current must be for the electromagnetic release of the C16 circuit breaker to operate.
I will round up, thus setting the basis for the strength of our calculation.
From the graph we can say that the inrush current should have a duration of approximately 0.005 s or 5 ms. And this is 100 times longer (if we count 5 μs) than the duration of the inrush current of our LED lamp.
Now let's check whether the machine will work if the current reserve is only 20%.
Initial data: 40 lamps.
Estimated current of one lamp: 0.2 A.
Estimated current for 40 lamps: 0.2*40=8 A.
Starting current of one lamp: 35A.
Starting current for 40 lamps: 35*40=1400 A.
Let's choose a circuit breaker with characteristic C10.
Ratio of starting current to rated current of the circuit breaker: 1400/10=140.
In principle, the same graph applies to this option: the starting current must be 0.005 s for the machine to operate.
Conclusion: when choosing LED lamps, inrush currents have virtually no effect on the choice of the rated current of the circuit breaker if the circuit breaker characteristic is “C” and the current reserve is at least 20%. I recommend that the circuit breaker reserve for LED lamps be 20-40%.
On lamps, I think there will be an article or video on youtube, where I will tell you about some features and nuances that you need to know about when choosing lamps.
Electrical switchboards and various control panels are widely used in industries, public buildings, and there are also options for use in domestic conditions. Without exception, all electrical circuit control units can be equipped with special signal lamps, control buttons and various switches. This equipment has a variety of purposes and applications, but in general it performs the function of monitoring and managing electrical circuits or monitoring the functioning of various equipment.
Electrical panels, basically, are manufactured based on the user’s wishes according to an individual order, and are equipped with various control modules. Users actually build their own electrical circuits and, to monitor and control them, use various modules for all kinds of switching and light indication for process control. All modules installed in the electrical network are divided into two types: informing and control. There are also combined versions of modules that can perform both functions.
TO informing include all kinds indicator lights, which consist of two parts, namely the module itself and the lamp for light emission, and can be installed in any electrical panel or control panel. The indicator, operating on LEDs, has a long service life of 6000 hours. All light indicators can be quickly mounted or dismantled and have a large range of colors, so the user is not limited in any way when choosing these devices. This type of device is used on switchboards and control panels in order to quickly attract the user’s attention and indicate the ongoing process in real time. Any digital sensor or measuring device needs to be constantly monitored, and the indicator light simply lights up, thereby making it clear about the status of the process.
Control modules– these are all kinds of switches, toggle switches and just control buttons. This type of module can be fixed permanently or portable. Fixed modules are used in places where the technical process does not require movement. Various toggle switches can have a varied switching range, so the user can select the module he needs.
Some buttons and switches have special protection to prevent accidental pressing, which can lead to harmful consequences. This protection includes special caps on the buttons, or even locks that are inserted into the button itself, and you need to turn the key to activate the module. There are also buttons with a large cover, they are made for emergency termination of processes. Thanks to the large button, the user can simply hit it, thereby triggering the module, this is very effective in emergency situations.
All lights, switches and various control buttons, have good protection and can be exposed to any external influences.
Circuit breaker - This is an automatic protective device designed to turn off short-circuit currents and shutdown in case of overcurrent.
Based on this description, we understand that the circuit breaker provides two types of protection, and it is very important to know and understand that the circuit breaker is designed to protect wiring. Think for yourself, in case of a short circuit, current which flows in the wires can reach from 1000A to 10,000 A. And it is clear that with such currents no cable will last long. A cable with a cross-section of 2.5 square millimeters, which is often used for residential electrical wiring, will burn like a sparkler at such currents. And it would not be surprising if this leads to a fire.
The second protection of the circuit breaker is the overload protection of the wires.
And again, it is very important to remember that it is the wiring that is protected. Since when too much load current flows through the wire, exceeding the rated one at least two or three times, the wire will become very hot, and eventually the insulation may melt and a short circuit will occur. Well, that is, of course, if there is no fire before that.
So we have decided on the importance of using a correctly selected circuit breaker, and now I suggest you move directly to the consideration of the criteria for selecting circuit breakers.
Selecting the circuit breaker rating
At , the first thing you need to pay attention to, and in general, let’s say, know in advance before you go to buy, is the rating of the circuit breaker. That is current, which would normally flow through this circuit breaker. And if the rated current is exceeded, the machine will turn off.
The current that will turn off the switch must be selected based on common sense. That is, if, for example, you have old wiring through which you can pass a current of up to 10A, and the expected load will be, say, about 20A, then you need to choose a circuit breaker based on the condition of ensuring the safety of the wiring, that is, choose the circuit breaker closest in rating to 10 A.
It also follows from this that you will have to periodically change the wiring, since as the number of electricity consumers increases, the load also increases. And over time, the old wiring is simply not capable of allowing such a large current to flow.
Electrical wiring is exactly the case in which it is appropriate to say: “The miser pays twice.” Therefore, if you are replacing electrical wiring, choose the wire cross-section with a margin.
Selecting a circuit breaker class.
You may be aware of such a phenomenon as inrush currents.
Starting currents- this is the current that flows when any consumer of electricity is turned on, and this current can exceed the rated current from 3 to 12 times. It is clear that different consumers have their own starting currents.
So, in order for the circuit breaker not to trip on inrush currents, like short circuit currents, there is such a thing as a circuit breaker class.
The class of the circuit breaker is indicated by a letter next to the number indicating its rated current.
Let's look at what classes there are:
B- withstands starting currents 3-5 times higher than the rated current.
WITH- withstands starting currents 5-10 times higher than the rated current.
D- withstands starting currents 10-12 times higher than the rated current.
So, the most commonly used in everyday life are circuit breakers with classes B and C.
Selecting the selectivity of the circuit breaker.
Selectivity - this is the property of protective automation to turn off only damaged sections of the electrical circuit. And to ensure this property, it is necessary to correctly select both the rating and the class of the circuit breaker.
To achieve selectivity of shutdown, the rating of the input switch must exceed the ratings of all circuit breakers in the group. And correspond to the maximum permissible load that the supply wire and apartment wiring can withstand.
Automatic switches of groups are selected based on the current that will flow through them.
Thus, in the event of a short circuit, say, in one of the sockets, only the circuit breaker of the socket group will turn off, and not the input circuit breaker.
Short circuit currents
Also with choosing a circuit breaker its breaking capacity should also be taken into account. Indeed, with high short circuit currents, the machine may simply not be able to open the contacts. This phenomenon is also called contact sticking.
Therefore, when choosing a circuit breaker, it is best to choose a circuit breaker that can disconnect currents of up to 3-4.5 thousand amperes. They will cost more, but consider it an investment in your safety. After all, imagine what will happen if your circuit breaker simply cannot, due to circumstances, turn off the short circuit...
Selecting a circuit breaker manufacturer.
As for choosing a manufacturer, many people are often interested in which country it was made in, but this is not entirely the right approach, since components are made in different places, and are even purchased from other manufacturers. Therefore, when choice It’s better to trust the manufacturer’s brand or the seller’s advice; after all, the seller has good purchase statistics and knows what circuit breakers they buy more often and make complaints less often.