Miniature circuit breakers cut off a circuit, or provide circuit interruption, when overload conditions are detected in a controlled circuit. Miniature circuit breakers are most commonly used in residential electrical units and in commercial buildings to control power sent from an electrical supply to the protected circuits.
Circuit breakers are electrical switches that are automatically activated to prevent damage to circuits due to short circuits or overload. Miniature circuit breakers carry out this function in specific applications.
Miniature circuit breakers contain two contacts that close and open via a spring-based mechanism. A thermal magnetic trip device in the circuit breaker trips the spring when current levels increase above a certain limit, which in turn causes the breaker contacts to open to divert the current.
Ground Fault Detection
Some advanced miniature circuit breaker designs house a fault-detection system. This system enables the breaker contacts to open in the event that a line-to-ground fault, or short circuit, is detected.
- ABB: Miniature Circuit Breakers
- "Newnes Electrical Power Engineer's Handbook"; D.F. Warne; 2005
- Photo Credit switch image by Clark Duffy from Fotolia.com
Miniature Circuit Breaker Theory
In complex electrical systems, a break, short or other fault in an electrical line can cause major problems. To prevent some of...
What Are the Functions of a Miniature Circuit Breaker?
What Are the Functions of a Miniature Circuit Breaker?. Circuit breakers are electrical devices designed to protect and control the amount of...
Electric Circuit Breaker Types
Circuit breakers, whatever their type, share a common function---to protect an electrical circuit against overloading and to avert damage to the circuit...
What Is the Function of a Circuit Breaker?
A properly designed electrical system is very safe. However, when problems occur, electricity can generate dangerous heat and can be fatal to...
How to Test a Circuit Breaker
Circuit breakers are found in your home's electrical box. If the current flowing into the various lights and appliances in your home...
Miniature Glazing Tutorial
When it comes to shading and highlighting miniatures, there are three options to consider. Layering involves choosing a color for your base...
The Disadvantages of a Miniature Circuit Breaker
An MCB prevents overloads that could damage devices plugged into a socket. electric outlet image by Dawn Williams from Fotolia.com
What Is a Molded Case Circuit Breaker?
Replacing glass and long cylindrical fuses, molded case circuit breakers have brought cost savings and reliability with their introduction. At one point...
How to Choose the Proper Amp Circuit Breaker
Circuit breakers are designed to protect electrical wires from overheating. A circuit breaker that is too small for the cable to which...
Definition of Thermal Circuit Breakers
A circuit breaker is an electrical switch that protects an electrical circuit from damage, which is generally caused by either overload or...
What Is the Meaning of Circuit Breaker?
Perhaps one of the most common electrical devices in our homes is the circuit breaker. It controls and distributes the one thing...