Automatic Circuit Breakers: What Are They and How Do They Work
These days, many of us remember the old automatic circuit breakers known as fuses. They were used in electrical meter panels and replaced ceramic fuses with circuit breakers. This was a convenient solution that allowed the fuses to be reused multiple times without the need to modify the panel's design. The first protective miniature circuit breaker was patented in 1923 by ABB. Although a lot of time has passed since then, the principles of automatic circuit breakers have remained unchanged: they prevent short circuits without human intervention. Our company offers only certified and high-quality automatic circuit breakers.
What is an Automatic Circuit Breaker?
An automatic circuit breaker is a switching electrical device that automatically disconnects electrical equipment in the event of overloads or short circuits.
Main Parameters of Automatic Circuit Breakers
Nominal current is one of the key parameters of automatic circuit breakers. For single-phase and three-phase consumers, circuit breakers in the range from 16 to 63 A are typically used.
Features of Automatic Circuit Breakers
When a short circuit occurs or more consumers are connected than calculated, the current exceeds allowable values, which leads to a circuit break. Automatic circuit breakers have two main protection systems:
- Thermal - activates when the nominal current consumption is exceeded by a maximum of three times. The current heats a bimetallic plate, which deforms and breaks the circuit;
- Electrical - used at high current values, depending on the type of breaker.
Types of Automatic Circuit Breakers
The type of breaker depends on the trip range of the electromagnetic release:
- Type “B” - 3-5 In;
- Type “C” - 5-10 In;
- Type “D” - 10-50 In.
Type “D” is used in industrial buildings with powerful motors, while type “B” is suitable for residential buildings, where there are no current surges, typically in lighting systems.
Nominal Interrupting Capacity
Automatic circuit breakers have another important characteristic - “nominal interrupting capacity,” which affects their reliability. When a short circuit occurs, an arc appears, and the duration of its existence directly impacts the lifespan of the breaker.
If you have any questions about selecting automatic circuit breakers, feel free to contact our managers at (099) 091-35-02. Consultation with a qualified specialist is always helpful when choosing electrical devices. Get in touch with us, and we will assist you!