How does the circuit breaker
Probably all of us know that the circuit breaker is used for the early repayment emerged a short circuit or overload formed. Have you ever wondered how it does it and what's inside. In this article I will try to give answers to these questions in the face of an example will be studied VA47-29 machine series.
Generally algorithm operation and internal structure of the same machine literally, quality varies only parts of the add, collect switching devices. Company with a reputation for used exclusively sturdy metals: silver, copper and bronze. A firmochki "simpler" - used alloys. Therefore, the most primitive way to check on the quality of the device is its weight and cost. Qualitative machine is not able to weigh less than 100 grams.
Major machine components
Opening the casing machine, the aforesaid generally implemented in two parts connected by rivets, one can contemplate the "internal organs" apparatus. Let's get acquainted with them closer
Under the following numbers denote:
1. Terminal for fixing the upper conductor;
2. Power terminal fixed;
3. Power terminal fixed;
4. Camera arc suppression;
5. flexible conductor;
6. The release solenoid;
7. The control lever;
8. Heat release character;
9. Regulating screw;
10. Terminal for fixing the lower conductor;
11. Specialized technological outlet vapor from arcing.
electromagnetic release
Purpose of the release in guaranteed instantaneous tripping formed a short-circuit. Wherein the off time depends on the type of the time-current characteristics. And basically there are three types: A, B, C.
For example, if you look at the machine, you can see such a coded entry C16Which means that the decay time is from one hundredth to one thousandth of a second.
Outwardly, it looks like this
The coil in the machine chain worth consecutively in a row with a thermal trip unit and contacts. During normal operation of the machine through the coil "run" operating current, but its value is not enough to pull the rod and to break the chain. In case, if the machine starts to run on the short-circuit current, its strength increases multiply, and it causes gain symmetrical magnetic flux signified retracts rod and thereby tears the chain by disabling machine.
heat release
The algorithm of the heat release is that it protects the wiring from a small but long nominally exceeding the allowable current value.
That is, the abrupt and short bursts of him anyway, but the long-term overload is, what it protects. contacts tripping speed still is subject to time - current dependence.
Externally it is a bimetallic plate having a free end which is bent by the heating and pressing on a lever trip.
Necessary parameters are laid directly on the shop floor assembly and adjustment during operation is not exposed.
Power contacts and arc-extinguishing chamber
Opening the power terminals under load causes arcing. And its power is proportional to the current "running through" at this point in the chain. And as we know the short circuit current may exceed the normal parameters of tens and even hundreds of times.
This means that the emerging arc necessarily hurt themselves and contacts the body of the machine. Just to avoid this was invented and installed arc chutes.
The principle of its action is: Obmednennye (or copper) plate located at an equal distance from each other into a plurality of arc tearing small components, and they are faded out on these plates without causing any harm neither themselves nor the contacts of the circuit breaker housing.
A formed at this point the gases are discharged through the hole.
Here we examined the internal structure of such a useful and necessary devices as a circuit breaker. Thanks for attention.
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