Gourt > Business > Electronics and Electrical > Circuit Protection
A circuit breaker is an automatically-operated electrical switch which is designed to protect an electrical circuit from damage caused by overload or short circuit. Unlike a fuse which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices which protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.
Operation
Some circuit breakers are implemented using a solenoid (electromagnet) whose pulling force increases as the current increases. The circuit breaker's contacts are held closed by a latch and, as the current in the solenoid increases, the solenoid's pull releases the latch which then allows the contacts to open by spring action. Another method of sensing current is with a bimetallic strip, which heats and bends with increased current, and is similarly arranged to release the latch. Some circuit breakers incorporate both techniques, with the electromagnet responding to short, large surges in current (short circuits) and the bimetallic strip responding to less extreme but longer-term overcurrent conditions.
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Sat, 11 Oct 2008 08:28:03 -0000
Boston Globe'Circuit breakers' give investors time to thinkFinancial Post, Canada - Oct 11, 2008Circuit breakers that halt trading may actually add to the fears of worried investors, Peter Hodson notes. For a few frightening moments in last Monday's ...US exchanges considering temporary circuit breaker: WSJ MarketWatchCircuit breaker levels for the NYSE: Financial TimesEarly Drop Wasn’t Enough to Trigger Trading Halt Wall Street Journal BlogsThe Associated Press - Los Angeles Timesall 219 news articles
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Fri, 10 Oct 2008 18:28:12 -0000
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Malaysian exchange says circuit breakers in place - Reuters
Mon, 06 Oct 2008 12:27:10 -0000
Malaysian exchange says circuit breakers in placeReuters - Oct 6, 2008KL: Quote, Profile, Research, Stock Buzz) said it had put in place safeguards such as circuit breakers to counter sharp market volatility. ...
Stewart-Cousins aims to hold seat - Lower Hudson Journal news
Sun, 12 Oct 2008 06:39:44 -0000
Stewart-Cousins aims to hold seatLower Hudson Journal news, NY - 2 hours agoKnown as a circuit breaker, that measure substitutes state payments for property taxes after a household's property taxes exceed a certain percentage of its ...
UPDATE 1-Nasdaq CEO backs circuit breakers to combat shorts - Reuters
Thu, 02 Oct 2008 22:17:09 -0000
UPDATE 1-Nasdaq CEO backs circuit breakers to combat shortsReuters - Oct 2, 2008Robert Greifeld said circuit breakers -- which could be used to halt shorts after certain stocks drop by a specified amount -- are preferable to a ...
Closure plans at Eaton Electric's Holyhead factory - WalesOnline
Thu, 09 Oct 2008 16:04:31 -0000
Closure plans at Eaton Electric's Holyhead factoryWalesOnline, United Kingdom - Oct 9, 2008A North Wales electrical circuit breaker manufacturer has started consultation with its 265 staff over closure plans as it seeks to move production to ...
Advanced Protection Technologies - Manufactures surge suppressors for the home and industry.
Meta Description: [ Makers of transient voltage surge supression products. information for consultant engineers, contractors, and supply houses. ]
Airpax - Thermal protection, electronic packaging and power protection products.
Meta Description: [ AIRPAX, DIMENSIONS and E-PLEX brand products are now produced under Sensata Technologies, Power Controls Division. Sensata Technologies has acquired Airpax Corporation LLC. | Sensata Technologies, Power Controls Division is a manufacturer of AIRPAX circuit breakers , AIRPAX bimetal thermostats... ]
Airpax Power Protection Products - Designs and manufactures magnetic circuit breakers and related products for telecommunications, industrial, power conditioning, HVAC, and information processing applications.
Meta Description: [ AIRPAX, DIMENSIONS and E-PLEX brand products are now produced under Sensata Technologies, Power Controls Division. Sensata Technologies has acquired Airpax Corporation LLC. | Sensata Technologies, Power Controls Division is a manufacturer of AIRPAX circuit breakers , AIRPAX bimetal thermostats... ]
Arc Fault detection - Information site about Arcfault detection systems, the site providing information on the causes and prevention thereof.
Meta Description: [ Arc Fault Detection Systems provides enhanced protection from dangerous arcing faults, arc
flash...
and more. ]
Arc flash calculator, short circuit analysis. - Power distribution system balanced symmetrical and unbalanced short circuit analysis needed for arc flash protection boundary, incident energy calculation, selection of electrical equipment, circuit protection devices. Bolted 3-phase, line to earth, double phase to ground, phase to phase, single phase open faults through zero and above zero impedance can be resolved.
Bender Inc. - Industrial protection for measuring voltage, current, phase loss, phase reversal, frequency and other conditions in AC and DC systems up to 690V.
Meta Description: [ current and voltage relays for single and three phase sytems in industrial applications ]
500
Bill Switchgear - Manufactures circuit breakers, circuit protection and control.
Meta Description: [ Manufacturers of switchgear, fusegear MCBs, MCCBs, distribution and panelboards ]
Bussmann - Products include extensive circuit protection solutions approved for use in a variety of major standards.
Meta Description: [ Cooper Bussmann manufactures electrical & electronics circuit protection products. ]
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Circuit Breaker Industries Ltd - CBI - Manufacturer of miniature and moulded case circuit breakers for overload and short circuit protection. From South Africa.
Controlab Inc. - Canadian manufacturer of phase failure and ground fault monitors.
Meta Description: [ Protect motors with 3-PHASE MONITOR from SINGLE PHASING and WRONG PHASE SEQUENCE. The CONTROLAB THREE-PHASE MONITOR or 3-PHASE MONITORS against SINGLE PHASING, PHASE LOSS, PHASE SEQUENCE REVERSAL
]
Cutler-Hammer, Inc - Manufacturer of circuit breakers, conductors, interrupters, surge protectors and breaker boxes.
Meta Description: [ Cutler-Hammer AFCI Arc Fault Circuit Breakers manufactured by Eaton. ]
Den Mar Industrial Fuses - Transformer, semiconductor, cable limiter and japanese fuses.
Meta Description: [ Fuses, fuses, fuseholders, circuit protection DEN MAR (DENMAR) industrial, 5x20mm, cartridge fuses 10x38mm fuses, fuse blocks, fuse clips, circuit protectors. Approvals including VDE, SEMKO, UL, CSA and METI, FUSE, FUSES, FUSIBLES, FUSIVEIS, PROTISTOR, SICHERUNGEN, BEZPIECZNIK, NPOOKA, NATEEKHEY,... ]
Dianxing Electrical Appliance Industry Co., Ltd. - AC voltage regulator manufacturer and exporter in China that supplies AC voltage regulators.
EFEN Engineers - Manufacturer of electrical, power and industrial fuses.
Meta Description: [ Specialist for fuses and switching gear for power generating companies and industrial concerns. HRC fuse links and fuse bases, lightening arresters, HV fuse links and special components for telecommunication in power networks. ]
EL-CO - Manufacturer of ceramic fuses, holders, household ceramic based sockets, plugs and connectors.
Meta Description: [ EL-CO - Low voltage equipment and industrial ceramic products. EL-CO - Echipamente de joasa tensiune si ceramica industriala. ]
Electrical Designer's Reference - Fault current calculator, motor circuit design and protection.
Electromotor Protection Co.,Ltd - Manufacturing electric protection unit control, for circuit, transformer and electromotor protection, electric transducer and bus monitor control.
Erik Larsen Pty Ltd - Cirlock for circuit breakers and Fuselock for fuse holders are a great safety lockout systems.
Meta Description: [ Cirlock specialises in Lockout Devices and Lockout Equipment for Energy Sources... ]
Ferraz Shawmut Canada, Inc. - Manufacturer of electronic fuses, fuse holders, resettable devices, power distribution blocks and accessories. Provides free on-line services in arc flash boundaries, incident energies, short circuit current calculations.
Ferraz Shawmut, Inc. - Develops and manufactures fuses, blocks and switches. Product specifications, news, and details of employment opportunities.
Meta Description: [ Ferraz Shawmut provides circuit protection solutions such as fuses, fuse holders, fuse blocks, switches and related accessories. The site is designed to assist those in the electrical industry, OEM designers, plant electrical professionals, electrical contractors, and specifying engineers, in the... ]
Fuse Holders Corp - Manufacturer of various fuse holders and clips.
FuseOne - Sells fuses for electric circuit protection from overstock and surplus supplies.
Meta Description: [ Fuses -From Buss fuses to fuse boxes, fuse holders to fuse blocks. ]
Fusetek - Canadian fuse manufacturer.
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Gamma Fuses - Distributor based in Florida USA, Gamma is a specialist fuse supplier of industrial fuses, and accessories.
Hepol Electric Enterprise - Manufacturer of circuit breakers, concators, fuses, relays, distribution boards and sockets plugs. from China.
Meta Description: [ Smarthome.com - World's Largest Home Automation Retailer for X10, home automation, security, remote control, lighting control, light switch, video surveillance, wireless, phone systems, pet care, home theater. ]
Hi-Tech Fuses, Inc. - Manufacturer of high-voltage current-limiting fuses, including backup and full-range types, for protecting electrical distribution equipment.
Hinode Electric co., Ltd. - Manufacturer of semiconductor fuses.
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Horstmann Gmbh - Manufacture of faulted circuit indicators, earth fault indicators, voltage detectors and phase comparators.
Meta Description: [ Horstmann GmbH, Heiligenhaus, Elektrotechnische Geraete und Anlagen, Electro-technical devices and systems ]
Inter-Cel - Manufacturer of thermal circuit breakers, thermal switches, bimetal thermostats, high temperature regulators, thermal protectors.
Meta Description: [ Inter - Cel ]
Jaker Electric Co., Ltd. - Manufacturer of load break switch, power fuse mounting base. From Taiwan.
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Jensen Devices AB - Manufacturer of gas discharge tubes.
Meta Description: [ An innovative company specialized on high performance gas discharge tube (GDT) technology. ]
Kusum Engineering Works - Manufacturer based in India, of circuit breakers, switchgear, fusegear, and motor control gear.
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Lexor Electronic Laboratories Ltd. - Delay line and filter network manufacturers.
LG Industrial Systems - Korean manufacturer of circuit breakers.
Meta Description: [ LS Industrial Systems provide Total Solutions for Industrial, Electronic Products and Automation Machinery and development-RFID, PLC, HMI, transformer, switchgear ]
Littelfuse Circuit Protection - Manufacturing and designing circuit protection including fuses, PTC and circuit breakers for automotive, electrical and electronic applications.
Loresco International - Manufacturer of carbon backfill and related products for the cathodic protection and electrical grounding industries.
Meta Description: [ Loresco International manufactures carbon backfill and related products for the cathodic protection and electrical grounding industries. ]
Luhfser - Expulsion fuse links protect high voltage transformers against fault currents, reduce loss during energy transmission. From Colombia.
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MD Semiconductor, Inc. - High current surge, transient voltage suppression device manufacturer.
Meta Description: [ SURGE SUPPRESSION DEVICES ]
Mechanical Products Co. - Manufacturer of circuit breakers.
MEM Low Voltage Products - Manufacturers of circuit breakers, switchgear, fusegear, low voltage switchboards, capacitors, TVSS and motor control gear.
Meta Description: [ Manufacturers of circuit protection and control equipment ]
Merlin Gerin - The electrical distribution information website for Merlin Gerin brand of Schneider Electric.
Meta Description: [ The electrical distribution information website for Merlin Gerin brand of Schneider Electric ]
Miami Breaker, Inc. - Manufactures replacement circuit breakers and automatic and manual transfer switches and is a distributor of motor controls, remanufactured breakers, GFI receptacles and electronic ballasts. From Florida, USA.
Meta Description: [ Miami Breaker (established 1994) manufactures new circuit breakers that will replace mechanically and electrically old style breakers. It also manufactures automatic and manual transfer switches, carry a large inventory of new motor controls, GFI receptacles and electronic ballasts made by major... ]
National Fuse Products - US supplier of domestic and foreign fuses, blocks, switches, and OEM/MRO accessories.
Meta Description: [ National Fuse Products presents domestic and international fuses like electrical fuses, electronic fuses, fuse blocks and accessories. ]
Ningbo Final Best Co., LTD - China manufacturer and distributor of fuses, fuse holders,switches and rocker switches
Meta Description: [ China supplier of switches,fuse,fuse holder, relays, audio connectors, combined preselection potentiometer,motors,. Ningbo FBE Electronics Co., Ltd. is one quality China supplier for you to purchase switches,fuse,fuse holder, relays, audio connectors, combined preselection potentiometer,motors,. ]
Ningbo Switchgear Electric Co.,Ltd - Manufacture of low voltage fuses, switch-fuse combination, thermal over-load relays and a complete set of switch equipment.
Meta Description: [ A China manufacturer of low voltage fuses, switch-fuse combination, thermal overload relays and a complete set of switch equipment ]
Orion Italia - Manufacturer of electrical measure and protection relays.
Meta Description: [ IPR - Feeder Protection ]
Poco Sales Inc. - US distributor of circuit breakers by Airpax, CBI, Eaton, ETA, Carlingswitch, Heinemann, Schurter. Featuring circuit breaker specifications, engineering drawings and design guides.
Meta Description: [ Circuit breakers in stock from Airpax, Carlingswitch, Carling Technologies, CBI, Eaton, ETA, Heinemann, Potter Brumfield, Schurter, Philips. ]
Portex. - Manufacturers and exporters of thermal and current controls of electrical equipment.
Precision Controls Company - Manufacturer of circuit breakers, motor protectors and thermal discs.
Meta Description: [ Precision Controls Company manufacturers Circuit Breakers, Motor Protectors and BiMetal Discs for several industries including automotive marine valve pump and appliance industries. ]
Rebeck Enterprise Co., Ltd. - Manufacturer of motor, circuit breaker, contactor, transformer, electrical/ HVAC components, relay, motor starter.
Reuter Hanney, Inc. - Provider of electrical testing, power quality studies, system design and coordination services to commercial, industrial and institutional facilities throughout the mid-Atlantic region.
Rowe Hankins Components Ltd - Distributor of circuit protection devices, switches,hydraulic,magnetic circuit breakers, switchgear, traction components and measuring systems.
Meta Description: [ Rowe Hankins - ElectroMechanical Component Specialists ]
Safe Line S.L. - Manufactures protection devices for overvoltage, low voltage, surge arrester and lightning. From Spain.
Safe-Tech Products - Electrical safety products to prevents accidental electrocution , including GFCI converters.
Safety Design, Inc. - US supplier of a lockout system that can be retrofitted to any electrical panel or circuit breaker.
Meta Description: [ PowerBloc is The Leader in OSHA APPROVED permanently mounted Electrical Lockout
Technology and implementation. ]
Sankosha USA - Manufacturer of gas tube surge arresters and gas discharge tubes for over voltage surge protection from lightning and other transient voltages.
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Sante Electrical Holding Co. - Manufacturers and exporters of residual current-operated and miniature circuit breakers.
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500
Schurter, Inc. - Manufacturer of circuit protection devices including fuses, holders, circuit breakers for equipment, connectors, power entry modules, cordsets and switches.
Selfuse Electronics (China) Co.,Ltd - Manufacturer of polymer PTC thermistors applied to protect circuits and battery packs against over-current and overheating.
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Shenzhen Ampron Sensitive Components Co., Ltd. - Manufacturer of PTC thermistor. From China.
Sleek Co., LTD - Manufacturer of fuses, micro fuses and resetable fuses.
Meta Description: [ Sleek Co., Ltd. Was founded in 1993 has adhered to its business philosophy by pursuing to manufacture products of international brand and achieve a pioneer of technology. By following the concept of good quality, we have manufactured fuse products of good quality and improved and reform the produ... ]
Sri Venkateswara Precision Components - Manufacturer of the final pole assemblies, cluster assemblies, isolating contacts and mechanism assemblies of breakers.
Stanley Switch Gear Products - Manufacturing switchgears for industrial, heavy industries and for agricultural pumps.
Meta Description: [ Manufacturer of Switch, Switches, Switchgears, Switch Gears, Change over Switches, Bus bar Chambers, Switch Fuse, Fuse Board, Distribution Fuse Board, Kit kat Fuses. ]
Taiwan Switch Co., Ltd. - Switch manufacturer; producing molded case circuit breakers, earth leakage circuit breakers, magnetic starters, fuses, control switches and sensitive devices.
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Tavrida Electric - Develops and manufactures fixed and withdrawable medium voltage vacuum circuit breakers, retrofit solutions based on proprietary compact vacuum circuit breaker modules, medium voltage surge arresters and low voltage contactors.
Tyco Electronics: Raychem Division - Manufacturer of overcurrent resettable devices, thyristor surge protectors, protected power switches and magnetics products.
Meta Description: [ Raychem Circuit Protection products help make your world safer and your electronics more reliable. />
Vimar Spa - Manufacturer from Italy of Circuit Breakers, RCBOs,interlocked socket-outlets, fuses, fuse holders and transient voltage suppressors.
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Wickmann - Manufacturer of miniature, subminiature, surface mount (SMT) and automotive fuses, protectors and circuit protection components.
Meta Description: [ The WICKMANN Group produces innovative Circuit Protection Fuses, Holders and Accessories for the Automotive, Electronic und Power industry ]
Wujin Zhenhui Electronic Co.,Ltd. - Manufacturer based in China supplying fuses, fuse holders, automotive fuses and thermal fuses.
Meta Description: [ 振晖电子有限公司创立于1992年6月。专业生产各种保险丝管、保险丝座、汽车插片熔断器、陶瓷熔断器等电子元件。 ]
Yueh Jyh Metal Industrial Co., Ltd. - Manufacturer based in Taiwan of fuses, circuit breakers, fuse holders and fuse blocks.
EMG - Elektro-Mechanik GmbH - We manufacture and sell short circuit indicators, earth fault indicators,
voltage indicators and voltage testers for medium voltage networks. Our
company is certified according to ISO 9001 (1994).
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