The modular load switch, what it is and how it differs from the circuit-breaker
All of us are well aware that such a circuit breaker, and what it is for, and that's what the load switch will say not everyone. In this article I will tell you what is a modular load break switch, as well as how they differ from the usual machine gun and where it is mainly used.
Content
What is a load switch (BH)
BH: what they are
How to distinguish from BH AB
Field of application of the load switches
conclusion
What is a load switch (BH)
So, load switch - this switch is designed to de-energize the network under load. By and large BH - this is nothing like a miniature circuit breaker.
Structurally BH possess enhanced contacts, and some models also have a so-called double contact gap that guarantees complete blackout area network and high service life of the HV elements.
Of course, you can disconnect the load and the conventional circuit breaker, but if you frequently use a circuit breaker to disable and enable the network load, the arc will spoil the contact group and the machine does not work in the most crucial moment. After all, the main purpose of the circuit breaker to protect the network (wiring), and the possibility of switching under load is secondary.
In BH (on some models) even provides access holes that you could see in the open or closed position of the switching device.
And to protect against accidental activation is a special lock.
If we look back a little, the classical representative of miniature circuit breakers is packet switches.
HV what they are
Load switches are available on 1,2,3 or 4 pole. The choice of the type of performance depends on whether you have a network (three-phase or single-phase), as well as whether there is a need to switch the neutral wire.
Rated current BH divided into the following values: 16, 20, 25, 32, 40, 63, 80, 100, 125 Amps.
Important. load switch does not protect against short circuit, so to use it you need to be sure in tandem with a conventional circuit breaker.
At the same time, consider the following rule for choosing the HV current rating it should be one or two orders of magnitude higher than the circuit breaker.
If you plan to use the BH together with the opening gun, please note that according to GOST 32397-2013 minimum current input device must be 40 amperes. Thus BH is best to mount the introductory machine.
Note. In addition to BH designed for 220 V and 380 V, there are also 6-10 kV HV But in this article, they will not be considered.
How to distinguish from BH AB
Visually, the two switching devices are quite similar, only the control lever in the load switch is more massive, and on the front side of the article written by the abbreviation "BH"
The advantages of using and application of circuit breakers
These switching devices have the following advantages:
1. They are designed for operation under load, so damage to the insulating members arc kept to an absolute minimum.
2. Increased electrical endurance.
3. Ability to work with a slight excess of the rated current.
And BH is used mainly as follows:
Often in the design solutions, multi-family houses, where off-line (for example, such as kitchen, bathroom, corridor, hall) are protected by its own separate machine, it is used instead of the switch opening machine load.
It is also advisable to use it in the water distribution unit apartment building to be able to disconnect the equipment and its further maintenance.
Or in the workplace, where you want to disable part of the power system maintenance.
In a private house, the application of BH, in my opinion, is not advisable.
conclusion
This material was taken up such a switching device as a load switch, as well as reviewed where it is generally used. If the article was useful to you, or are interested in, then put his finger up. Thank you for your attention!