Bipolar circuit breaker, what are its applications and how to dimension?
Circuit breakers are protection devices that are present in all residential, commercial and industrial installations! This is due to the fact that they are mandatory in all installations according to the NBR5410 standard. Among the types of circuit breakers, the bipolar circuit breaker whether 220V or 127V is a circuit breaker that not everyone knows, and it is this circuit breaker that the World of Electrical will talk about in this article. Come on, guys!
Bipolar circuit breaker: What is it?
The circuit breaker is an electrical device that has the function of protecting the electrical installation when an overload, a power surge or a short circuit occurs. The bipolar circuit breaker does not differ from this definition, it only performs this protection by monitoring the two phases that pass through it.
Bipolar breaker! Know what it is.
The bipolar circuit breaker of the Din type and Bipolar circuit breaker of the Nema type!
When the electrical current that the circuit breaker monitors reaches a value greater than the value supported by it, the circuit breaker activates a mechanism that opens the circuit and thus interrupts the passage of electrical energy to the load, which prevents the burning of the devices that are after the breaker or reduces the damage that could occur to the electrical installation.
The bipolar circuit breaker is used in two-phase installations, where there are two phases and one neutral, for example, it can be two-phase 220V (Phase – Phase) or single-phase 127V / 220V (Phase – Neutral).
Circuit Breaker Types
See the many types of breakers!
What are the types of circuit breakers?
Among the many types of the circuit breaker, we can mention the best known, such as:
Monopolar Circuit Breaker
Bipolar Circuit Breaker
Three-pole Circuit Breaker
Monopolar DR Circuit Breaker
Bipolar DR Circuit Breaker
Din Circuit Breaker
Nema circuit breaker and others
Bipolar Circuit Breaker: How to Dimension?
The dimensioning of a bipolar circuit breaker is very similar to the dimensioning of the monopolar circuit breaker. This dimensioning takes into account some factors, which will be addressed below.
Circuit Breakers Curve
Knowing the characteristics of the electrical components is a great advantage for an electrician, and the circuit breaker curve is a very important characteristic to know, as it defines the application of the circuit breaker, that is, the type of circuit breaker curve directly influences where this circuit breaker will be. used.
The broken curve of a circuit breaker is the time that a current above the limit of the circuit breaker is supported before it trips, can also be defined as the tolerance for a peak current, which can be N times greater than the rated current. This tolerance is necessary because many devices and equipment, when turned on, generate very fast peak energy and immediately after this peak the current normalizes again.
Another reason for which the circuit breaker curve is necessary is the sensitivity of the electrical devices, as some of them are very sensitive and if the power section is not very fast, they can burn or be damaged. Each device or electrical device has a sensitivity and therefore the circuit breaker curves have been categorized into curves B, C, and D so that each category protects a specific group of devices.
It is of utmost importance that you choose the category of the circuit breaker curve that best matches your installation.
Circuit Breaker Current Calculation
To be able to dimension the circuit breaker, it is necessary to know the total current of the circuit to be protected, since the circuit breaker will work monitoring this current. And to discover this chain we use Ohm’s Law because most of the time the devices do not have the chain on the packaging or manual.
Current calculation formula.
Ohm’s Law: Calculation of Electric Current!