What Are Circuit Breakers?

Circuit Breakers are devices that stop the electrical current of a circuit in the event of excess or very high voltage. Circuit breakers are handy, not only because they can protect against electrical fires but also because they can be reset. When a fuse blows out, it must be replaced each time, whereas circuit breakers are easily reset when tripped.

Each appliance in your home receives electrical currents by way of electrical circuit breakers. Circuit breakers are considered to be either main or individual. The main circuit breaker controls power to the entire house while individual circuit breakers transmit power to individual appliances.

Electrical circuit breakers are probably the most important safety feature in a building. A circuit breaker measures the amount of heat produced by the current or by the magnetic field created by the small coil inside the breaker. When the current becomes too high, the breaker will cut off the circuit to stop it. Fuses serve the same function but can only be used once. Anyone who has blown a fuse can tell you it is much easier to have circuit breakers.

Electrical circuit breakers are also useful for shutting down power to the entire house. If you need to do some electrical maintenance, either for the entire structure or individual electrical wires, shutting down the main breaker can be a safety tool. Although electrical waves are invisible, we all know they have great potential danger. You should label each individual electrical circuit breaker so it is easily accessible for future use.

Direct current, or DC circuit breakers, are commonly used in automobiles. DC circuit breakers, unlike alternate current (AC) breakers, only deliver currents in one direction. These types of circuit breakers are a renewable energy delivery source, and special precautions should be taken when using them.

Since all batteries have the capability of producing enormous amounts of energy when short-circuited, care should be taken to properly install the breaker, fuse and disconnects in a vehicle. Autos should have additional protection against over current for the battery and each of the branch circuits. Vehicle fires sometimes result when the owner does not take proper precautions.

DC circuit breakers often have plastic beads inside of the fuse. When the current becomes too heavy, these plastic beads can melt and fill the void inside the fuse and prevent an arc from forming. If the current is very heavy this can cause electrical fires. While DC circuit breakers are effective in preventing damage from an overload of current, they are only effective to a certain degree. Any power source using DC technology should have a backup master fuse to protect the vehicle against total short-circuit.

Circuit Breakers Info provides detailed information about circuit breaker panels, circuit breaker manufacturers, plus advice on how to replace and install circuit breakers and where to buy used and surplus circuit breakers. Circuit Breakers Info is the sister site of Electricians Web.

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Palestinians pray over the bodies of  people killed near a United Nations school Tuesday, during their funeral in the Jebaliya refugee camp, in the northern Gaza Strip, Wednesday, Jan. 7, 2009. Israel's military paused its Gaza offensive for three hours Wednesday to allow food and fuel to reach besieged Palestinians, and the country's leaders debated whether to accept an international cease-fire plan or expand the assault against Hamas. With criticism rising of the operation's spiraling civilian death toll and Gazans increasingly suffering the effects of nonstop airstrikes and shelling, Israel's military said it opened 'humanitarian corridors' to allow aid supplies to reach Palestinians.(AP Photo/Hatem Moussa)AP - Israel resumed its Gaza offensive Wednesday, bombing heavily around suspected smuggling tunnels near the border with Egypt after a three-hour lull to allow in humanitarian aid. Hamas responded with a rocket barrage.



President-elect Barack Obama gestures during a news conference at his transition office in Washington, Wednesday, Jan. 7, 2009, where he introduced Nancy Killefer, not shown, to the newly created position of chief performance officer. (AP Photo/Lawrence Jackson)AP - Pointing with concern to "red ink as far as the eye can see," President-elect Barack Obama pledged Wednesday to tackle out-of-control Social Security and Medicare spending and named a special watchdog to clamp down on other federal programs — even as he campaigned anew to spend the largest pile of taxpayer money in history to revive the sinking economy.



Illinois U.S. Senate Appointee Roland Burris, left, meets with Senate Majority Leader Harry Reid of Nev., Wednesday, Jan. 7, 2009, on Capitol Hill in Washington. (AP Photo/Susan Walsh)AP - Senate Democrats beat a hasty retreat Wednesday from their rejection of Roland Burris as President-elect Barack Obama's successor, yielding to pressure from Obama himself and from senators irked that the standoff was draining attention and putting them in a bad light. Burris said with a smile he expected to join them "very shortly."



In this photo provided by the Washington State Department of Transportation, water rushes past a washed out road near Blewett Pass on U.S. highway 97 in Washington State on Wednesday, Jan. 7, 2009 in Washington State. (AP Photo/Washington State Department of Transportation)AP - Rain and high winds lashed Washington state Wednesday, causing widespread avalanches, mudslides, flooding and road closures as the heavy snowfall that has buried parts of the state began to rapidly melt.



President-elect Barack Obama is welcomed by President George W. Bush for a meeting at the White House in Washington, Wednesday, Jan. 7, 2009, with former presidents, from left, George H.W. Bush, Bill  Clinton, and Jimmy Carter.  (AP Photo/J. Scott Applewhite)AP - Confronting a grim economy and a Middle East on fire, Barack Obama turned Wednesday to perhaps the only people on the planet who understand what he's in for: the four living members of the U.S. presidents' club.



Workers put bullet proof glass on President-elect Barack Obama's Inaugural Reviewing Stand on Pennsylvania Avenue in front of the White House in Washington, Monday, Jan. 5, 2009. (AP Photo/Ron Edmonds)AP - The upcoming inauguration of Barack Obama is an attractive target for international and domestic terrorists, but U.S. intelligence officials have no information about specific threats to the Jan. 20 event.



AP - You've heard of making cheese from goats' milk, but prescription drugs? In what would be a scientific first, an anti-clotting drug made from the milk of genetically engineered goats moved closer to government approval Wednesday after experts at the Food and Drug Administration reported that the medication works and its safety is acceptable.

In this image released by Warner Bros., Heath Ledger starring as The Joker, is shown in a scene from 'The Dark Knight.'  (AP Photo/Warner Bros. Pictures, Stephen Vaughan)AP - Holy, People's Choice Awards, Batman! "The Dark Knight" soared away with every trophy it was nominated for Wednesday at the 35th annual fan-favorite CBS ceremony. The caped crusader flick won five awards, including favorite cast, superhero, action movie and on-screen matchup for Christian Bale's Batman and Heath Ledger's Joker.



Harvard's Jeremy Lin (4) drives for the basket in front of Boston College's Rakim Sanders in the first half of an NCAA college basketball game Wednesday, Jan. 7, 2009, in Boston. (AP Photo/Michael Dwyer)AP - Jeremy Lin scored 27 points to lead Harvard to an 82-70 upset over No. 17 Boston College on Wednesday night, three days after the Eagles upset previously top-ranked North Carolina.



In this  Sept. 28, 2008 file photo, New York Jets coach Eric Mangini gestures on the sidelines during the third quarter of an NFL football game against the Arizona Cardinals at Giants Stadium in East Rutherford, N.J. The Cleveland Browns have agreed to hire Eric Mangini as their head coach, a person with knowledge of the negotiations told The Associated Press, Wednesday, Jan. 7, 2009. (AP Photo/Bill Kostroun, File)AP - Eric Mangini is the new head coach of the Cleveland Browns, a week after being fired by the New York Jets. A person with knowledge of the negotiations told The Associated Press that Mangini will be introduced Thursday at a news conference at the team's headquarters in Berea.



An Israeli soldier stands next to blindfolded Palestinian prisoners after they were arrested during an Israeli military operation in the northern Gaza Strip January 7, 2009, in this picture released by the Israeli Defence Forces (IDF). U.S. Secretary of State Condoleezza Rice said on Wednesday she had pressed Israel to seriously consider an Egyptian ceasefire plan as the U.N. Security Council weighed action to end Israel's attack on Gaza. (IDF/Handout/Reuters)Reuters - Israeli warplanes bombed the Gaza Strip on Thursday and tanks pounded Palestinian guerrillas on the ground as U.S. backing for a proposed truce raised expectations of an end to the offensive.



Senate-designate Roland Burris talks with Senate Majority Leader Harry Reid in Reid's office on Capitol Hill, January 7, 2009. (Larry Downing/Reuters)Reuters - In an abrupt switch, Democratic leaders began talks on Wednesday to swear in Roland Burris, appointed by embattled Illinois Gov. Rod Blagojevich to replace President-elect Barack Obama in the U.S. Senate.



President Bush greets President-elect Barack Obama at the White House, November 10, 2008. (Joshua Roberts/Reuters)Reuters - The U.S. budget deficit will swell to a record $1.186 trillion in fiscal 2009, congressional forecasters said on Wednesday, the result of an economic recession that has cut tax receipts and caused massive government bailouts of banks and automakers.



Reuters - U.S. cities are vulnerable to an attack like the gun-and-grenade assault that terrorized Mumbai for three days and killed 179 people, the White House homeland security adviser said on Wednesday.

Ali al-Marri, who has been held for 5-1/2 years at a U.S. military prison in South Carolina, is seen in this undated photograph released to Reuters on January 6, 2008. An early test for President-elect Barack Obama will be the case of suspected al Qaeda 'sleeper' agent Marri, which will force Obama to take a position on his predecessor's claim that anyone the president deems a national security threat can be imprisoned indefinitely without charges in the United States. (Handout/Reuters)Reuters - The case of Ali al-Marri, accused of being an al Qaeda "sleeper" agent and held for 5-1/2 years at a U.S. military prison in South Carolina, will be an early test for President-elect Barack Obama.



Eggs are stacked up at an egg farm in San Diego County, July 29, 2008. (Mike Blake/Reuters)Reuters - An outbreak of salmonella food poisoning has made 388 people sick across 42 states, sending 18 percent of them to the hospital, U.S. health officials said on Wednesday.



Bernard Madoff is escorted in a vehicle from Federal Court in New York, January 5, 2009. (Lucas Jackson/Reuters)Reuters - Accused swindler Bernard Madoff should be jailed for violating a court order by mailing $1 million worth of diamonds, watches and other jewelry to friends and family, U.S. prosecutors told a court on Wednesday.



An Austrian hotel owner lights a gas stove. Envoys from Russia and Ukraine go to Brussels on Thursday for emergency EU-brokered talks to resolve a bitter gas fight between the two ex-Soviet giants that has engulfed Europe in a major energy crisis.(AFP/Joe Klamar)Reuters - Russia and Ukraine argue their case to Europe on Thursday in a gas price dispute that has choked off energy supplies to EU countries beset by bitter winter weather.



A Palestinian protestor flashes the V for 'victory' sign in front of an Israeli soldier near Damascus Gate in Jerusalem's old city. Israeli warplanes bombed suspected arms-smuggling tunnels in southern Gaza early Thursday, as diplomats worked to secure a ceasefire in an offensive that has killed 700 Palestinians.(AFP/Ahmad Gharabli)AFP - Israeli warplanes bombed suspected arms-smuggling tunnels in southern Gaza early Thursday, as diplomats worked to secure a ceasefire in an offensive that has killed 700 Palestinians.



A woman looks at a manometer set on a gas pipe at a compressor station in the Ukrainian city of Boyarka. Envoys from Russia and Ukraine go to Brussels on Thursday for emergency EU-brokered talks to resolve a bitter gas fight between the two ex-Soviet giants that has engulfed Europe in a major energy crisis.(AFP/File/Sergei Supinsky)AFP - Envoys from Russia and Ukraine go to Brussels on Thursday for emergency EU-brokered talks to resolve a bitter gas fight between the two ex-Soviet giants that has engulfed Europe in a major energy crisis.




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