Circuit breakers

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Circuit breakers
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According to estimates, more than 30 million molded case circuit breakers are installed worldwide every year. Thats a significant number for one of the most important components in modern low-voltage power distribution.
State-of-the-art molded...

Selective main miniature circuit breakers are used as circuit breakers at meter panels or as group miniature circuit breakers in distribution board applications.
Characteristic E is adapted to the special application requirements for cascade circuits between melting fuses and miniature circuit breakers.
The devices...

Air Circuit Breakers 3WL offer a flexible design which has integrated communications technology. The flexible design along with powerful technology...

Presenting a top of the line compact design, the SENTRON 3VL molded-case circuit breakers meet all requirements placed upon space-saving electrical distribution systems...

The innovative 5SL miniature circuit breaker has the same features and more as other Siemens MCBs and can be used up to 6kA. It has a striking design with color-coded, easy to recognize switching...

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Principal switch setting energy resources supply a fast reaction to overcurrent types of conditions around the result end, stretching working lifespan. Particular safety of specific voltage routes over the supplementary end through regular circuit breakers can often be unproductive. This...

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Reliability and versatility that is what we look for most of the times. Well need not look further. The EATON Motor Protective Circuit Breaker PKE is truly a world...

Motor Protection Circuit Breaker PKE - Ready für "IE3"

PKE motor-protective circuit-breakers with electronic wide-range overload protection offer an interesting...

Motor Protective Circuit Breakers PKZM0 - PKZM4 - ready for "IE3"

The entire range from 0.1 A to 63 A is covered by just two motor-protective circuit-breakers....

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The TA35 Rocker 1Pole by Schurter is a single-poled highly configurable thermal circuit...

The aspect that makes the difference between this item and other similar products available on the market are...

This product is definitely designed for standard and medical applications, power supplies, HVA, UPS, industrial, medical diagnostic and household appliances....

T11 circuit breakers are one of the ranges of components manufactured for single pole push reset function feature. These circuit breakers are in-line small...

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The same height and depth is found in all of the SACE Emax circuit-breakers in both the withdrawable and fixed version. The breakers enable the construction...

The SACE Emax 2 is ABB'S innovative air circuit breakers that only utilizes...

The SACE Emax 2 is ABB'S innovative air circuit breakers that only utilizes...

With a 6,300-A voltage capability, ABB's SACE Emax 2 is a suitable and cost-efficient apparatus...

The SACE Emax 2 is ABB'S innovative air circuit breakers that only utilizes...

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MS132 is a compact and powerful range in 45 mm width for motor protection up 15 kW (400 V) / 32 A. This...

MS132-T is a circuit breaker for transformer protection up to 12.5 kW (400 V) / 25 A. 14 variants are available with current ranges from 0.1 A...

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With more than 50 years of solid experience and knowledge in providing aerospace applications solutions, Crouzet Aerospace produces aerospace components that guarantee maximum performance and excellent quality. With a whole line of products perfect for aerospace applications, Crouzet Aerospace is also...

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Circuit-Breakers for Motor Protection Series 8523/8

Explosion protection to
CENELEC
IEC
Can...

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Built for modern applications, the SUPER AE air circuit breaker includes a series of models. The starting model is built to handle 1000 to 6300 A upwards,...

This one of a kind moulded-case circuit breakers of the Mitsubishi breaker series are the smallest compact circuit breakers world-wild with electronic overload. It is based...

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The HVR-63 GCB is a generator circuit-breaker manufactured by ABB. It is ideal for retrofitting or replacing power plants with unit power of up to 180 MW. It features an...

The Disconnecting Circuit Breaker (DCB) with Fiber Optic Current Sensor (FOCS) from ABB is suitable for use with IEC 61850-9-2LE process bus communication. The Fiber Optic Current Sensor changes the conventional...

The LTA 72D1 is a live tank circuit breaker manufactured by ABB. It utilizes carbon dioxide as the insulation and arc extinguishing medium. This replaces...

The ABB EDF SK Auto Puffer spring drive operating mechanism circuit breakers are designed for use outdoors. This high-performance...

The combined apparatus of EDT SK relies on credible SF6 live tank breaker technology of ED type. Additionally, there is also one centralized compartment per pole having an internal...

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Bulletins 140G Molded Circumstance Signal Breakers have 8 different body sizing's having a selection...

The circuit breakers from Bulletin 188 are best to be used in extreme conditions...

The Bulletin 1492-RCD Residual Current Devices are utilized to detect earth leakage. They can be used...

Bulletin 1489-M thermal-magnetic Circuit Breakers are approved for branch circuit protection in the United...

The High-Density Circuit Breakers from Rockwell Automation offer single-pole circuit breakers...

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According to our own exposure to the S1, HGF as well as FXT kinds of circuit breakers, the actual enhanced GL300 series is actually less dangerous and much more dependable. It provides a brand new technology spring functioning system as well as connecting rod which allow fast and...

The actual circuit breaker is essential toward substation protection along with safety. The actual great efficiency Alstom Grid Dead Tank circuit breaker, designed with innovative engineering, has shown trustworthiness. It takes hardly any upkeep and is also very easy to set up. The particular SF6 Dead...

Many of todays power plants are more than 20 years old and the need to extend their life time is increasing in todays economic and energy context. For this reason, refurbishment or retrofit is necessary to renew the power plants by replacing the main equipment including...

This PKG circuit breaker and load break switch are used to make power plants at 2000 MW in size easier to...

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The VR-Series vacuum breaker replacements are designed with similar functions...

AR-series power circuit breaker replacements are designed to be...

Eaton 1U Series Slimline hydraulic magnetic breaker gives improved reliability, safety and performance by using a patented snap action...

With the help or parallel wiring configuration, the AM1P facilitates 200 amperes in a 2-pole design...

Popular in outdoor locations, the C Series is ideal for use in either low or high temperature environments where...

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In purchasing equipments reliability is of utmost importance. Bulletin 1489 Industrial...

You are looking at one of the most advanced miniature circuit breakers available on the market, for which...

Rockwell Automation Bulletin 1492-MC Thermal Magnetic Circuit Breakers are used for giving precise...

Presenting a top of the line new product. Bulletin 140M Motor Protection Circuit Breakers are...

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Our live-tank circuit breakers 3AF0 excel in their ability to reliably switch off overhead lines. The special technical features of live-tank design...

In 2006, Siemens introduced the new global class dead-tank SDV6 outdoor vacuum circuit breaker with the trustworthy Siemens 3AH3 vacuum circuit breaker. Designed specifically for the U.S. ANSI market, the stationary distribution vacuum circuit breaker has passed the entire ANSI type-testing...

The 3AF04/3AF05 OVCBs for AC traction power supplies consist of three major parts: the pole assembly, the operating mechanism box, and the supporting steel structure. For easy access, the operating mechanism box is situated inside the supporting steel frame. It features the circuit-breaker...

Today about 80 percent of power network operators decide in favour of vacuum switching technology.
The market share of vacuum circuit-breakers is more than 99 % in Germany.

The core component of...

The vacuum circuit breaker type 3AH4 up to 36 kV is designed for extremely high numbers of operating cycles: It controls...

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For over 50 years, Mitsubishi low voltage circuit breakers, such as the WS-V Series equipped with...

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The small protective circuit-breakers come...

These circuit breakers for power distribution are available in different configurations to enable...

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These circuit breakers are intended for short circuit and to provide safety on engine applications which can cover a current range from 0.1 up...

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Siemens has designed these high-quality and high-performance circuit breakers as a result of research and innovation that fits the present environmental and technological scenario....

This circuit breaker has many special features including live-tank circuit breaking...

The exceptional features of the design of this dead-tank involves having a perceived quality of being created with...

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An exciting new circuit breakers were released and these circuit breakers are in Compliance with standards IEC EN 60898 or IEC 60947-2 (depending on...

Schneider Electric C120 modular circuit-breakers can handle nominal current ranging from 10 to 125 A and offer a range of breaking capacity and...

This high-end device has a nominal current of 10 to 125A. Its operating voltage is up to 500 Vac with an insulation voltage...

This unit has a rated current of 16 to 160A, rated operational voltage of 500V AC, and three possible breaking performances at 16, 25 and 35kA, and under...

C60 UL/CSA/IEC is one of the top circuit breakers in North American standards. This highly capable device has a rating current of 0.5 to 63A....

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How to choose this product

circuit-breaker

A circuit breaker is an electrical protection device that cuts power to an electrical cable in case of overvoltage, short circuit or if the circuit presents an isolation defect.

Applications

Circuit breakers are used in industrial facilities to protect circuits and electrical machinery.

Technologies

Thermal circuit-breakers use a bimetallic strip that expands and opens the circuit in the presence of excessive currents. It protects conductors from prolonged over amperage and fire-risks. Magnetic circuit-breakers use a coil, as in relays. They can open the circuit immediately or after pre-set delays (e.g. for motor-starting). Thermal magnetic circuit-breakers combine these two systems. High-end electronic circuit-breakers can be adjusted for extremely precise activation.

Differential circuit-breakers protect against ground leakage. In case of isolation defects, the sum of the phase currents is not equal to the current circulating in the neutral. A magnetic circuit uses this difference to trigger the device. Circuit-breakers interrupt power to electrical supply lines. High-voltage circuit-breakers use gas, oil or compressed air to increase their ability to cut power and extinguish electrical arcs.

How to choose

The main parameters are the rated current (In), well under the trip level (Icu or Icn), beyond which the circuit's integrity is at risk, and the device's class.

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