Circuit breakers

Do you need help making a decision?  Take a look at our buying guide
133 companies | 682 products
exhibit your products

& reach your clients in one place, all year round

Exhibit with us
Search
Circuit breakers | Choosing the Right Circuit Breaker
A circuit breaker is an essential safety device for any piece of equipment or network through which an electric current flows. Quite simply it will, as the name indicates, break the circuit and stop the current flowing if it detects any dangerous anomalous current, voltage, or temperature levels in the circuit. Generally, in an industrial context, electricity passes through a circuit-breaker box where it is divided into several circuits. Each of these circuits...
{{#pushedProductsPlacement4.length}} {{#each pushedProductsPlacement4}}
{{product.productLabel}}

{{product.productLabel}} {{product.model}}

{{#if product.featureValues}}
{{#each product.featureValues}} {{content}} {{/each}}
{{/if}}
{{#if product.productPrice }} {{#if product.productPrice.price }}

{{product.productPrice.formattedPrice}} {{#if product.productPrice.priceType === "PRICE_RANGE" }} - {{product.productPrice.formattedPriceMax}} {{/if}}
{{/if}} {{/if}}
{{#if product.activeRequestButton}}
{{/if}}
{{product.productLabel}}
{{product.model}}

{{#each product.specData:i}} {{name}}: {{value}} {{#i!=(product.specData.length-1)}}
{{/end}} {{/each}}

{{{product.idpText}}}

{{productPushLabel}}
{{#if product.newProduct}}
{{/if}} {{#if product.hasVideo}}
{{/if}}
{{/each}} {{/pushedProductsPlacement4.length}}
{{#pushedProductsPlacement5.length}} {{#each pushedProductsPlacement5}}
{{product.productLabel}}

{{product.productLabel}} {{product.model}}

{{#if product.featureValues}}
{{#each product.featureValues}} {{content}} {{/each}}
{{/if}}
{{#if product.productPrice }} {{#if product.productPrice.price }}

{{product.productPrice.formattedPrice}} {{#if product.productPrice.priceType === "PRICE_RANGE" }} - {{product.productPrice.formattedPriceMax}} {{/if}}
{{/if}} {{/if}}
{{#if product.activeRequestButton}}
{{/if}}
{{product.productLabel}}
{{product.model}}

{{#each product.specData:i}} {{name}}: {{value}} {{#i!=(product.specData.length-1)}}
{{/end}} {{/each}}

{{{product.idpText}}}

{{productPushLabel}}
{{#if product.newProduct}}
{{/if}} {{#if product.hasVideo}}
{{/if}}
{{/each}} {{/pushedProductsPlacement5.length}}
thermal-magnetic circuit breaker
thermal-magnetic circuit breaker
1489 series

Primary current: 0.5 A - 63 A
VAC: 277, 480, 240 V
VDC: 96, 48 V

... Bulletin 1489-M Thermal-magnetic Circuit Breakers are UL 489 Listed for branch circuit protection in the United States and Canada, and they are certified as Miniature Circuit ...

See the other products
Allen Bradley
short-circuit circuit breaker
short-circuit circuit breaker
HVR-63 series

Primary current: 0 A - 8,000 A
VAC: 24 kV

The latest generation of generator circuit-breaker (GCB) With the new HVR-63 GCB, Hitachi ABB Power Grids continues to lead the way in designing the most advanced GCBs. The HVR-63 is the latest generation ...

See the other products
ABB AG
magnetic circuit breaker
magnetic circuit breaker
PISA11.401

Primary current: 43 mA
VDC: 24 V
Rating: 4 A

... 1 A 1 A 1 A Output current limitation min./max. - 9 / 12.7 A Turn-on delay of outputs - 270 ms Shutdown-times at short circuit, typ. - 110 ms Overview Dimensions (WxHxD) - 45 mm x 75 mm x 91 mm Weight per unit ...

See the other products
PULS GmbH
magnetic circuit breaker
magnetic circuit breaker
(MCCB) NF

... including "F-style" small size breakers, with improved usability. The molded case circuit breaker (MCCB) opens and closes a low voltage circuit, and breaks the fault ...

magnetic circuit breaker
magnetic circuit breaker
(ACB) AE-SW

Make electrical equipment multi-functional by means of Mitsubishi air circuit breakers that are suitable for protection of the main circuit. Air circuit breakers ...

thermal-magnetic circuit breaker
thermal-magnetic circuit breaker
BHW-T10 (DIN-Series)

Primary current: 0.5 A - 100 A
VAC: 240 V - 415 V

... replacement of miniature circuit breakers on the DIN rail. All terminals are Bi-Connect for ultimate flexibility. Deep serrated terminals provide the mounting of cables up to 35 mm² cross-section. The ...

air-operated circuit breaker
air-operated circuit breaker
AE-SW

Primary current: 1,000 A - 6,300 A
VAC: 500 V

Make electrical equipment multi-functional by means of Mitsubishi air circuit breakers that are suitable for protection of the main circuit. Air circuit breakers ...

See the other products
MITSUBISHI Automation
thermal-magnetic circuit breaker
thermal-magnetic circuit breaker
1489-M series

Primary current: 0.5 A - 63 A
VAC: 480, 230, 400 V
VDC: 48, 96 V

... Bulletin 1489-M Thermal-magnetic Circuit Breakers are UL 489 Listed for branch circuit protection in the United States and Canada, and they are certified as Miniature Circuit ...

See the other products
Allen-Bradley
single-pole circuit breaker
single-pole circuit breaker
MS3320 series

Primary current: 0.5 A - 30 A

Electromechanical Circuit Breakers (CB) with several different terminals (FASTON, EN, MIL...) and accessories.

See the other products
Crouzet
magnetic circuit breaker
magnetic circuit breaker
MS132-32

Primary current: 32 A
VAC: 600 V
VDC: 400 V

... protect them reliably and without the need for a fuse from short-circuits, overload and phase failures. The manual motor starter offers a rated service short-circuit breaking capacity Ics ...

See the other products
ABB
motor protection circuit breaker
motor protection circuit breaker
PKE series

Primary current: 32 A - 65 A
VAC: 400 V

PKE motor-protective circuit-breakers with electronic wide-range overload protection offer an interesting alternative to the bimetal solution for motor currents up to 65 A. PKE motor-protective circuit-breakers ...

See the other products
Eaton
overcurrent circuit breaker
overcurrent circuit breaker

Primary current: 30 A - 5,000 A
VAC: 120 V - 600 V

... separate upstream fault protection and respective interconnections, which in turn reduces installation space, time, and cost. Breaker-based Service Entrance Rated transfer switches are available from 30A to 5000A.

voltage circuit breaker
voltage circuit breaker
SB6100 series

Primary current: 10 mA - 100 mA
VAC: 600 V

Special-Purpose Ground-Fault Circuit Interrupter (GFCI), Class C and Class D Industrial Shock Block (ISB) is a personnel protection device designed to meet the requirements for special-purpose GFCIs defined by UL 943C. ...

digital circuit breaker
digital circuit breaker
MasterPact MTZ

Primary current: 800 A - 6,300 A
VAC: 220, 415 V

Future Ready ! MasterPact MTZ is a comprehensive range of air circuit breakers, to protect from damage caused by overloads, short-circuits or insulation faults. MasterPact MTZ embeds ...

See the other products
Schneider Electric
thermal circuit breaker
thermal circuit breaker
W31-X2M1G-40

Primary current: 40 A
VAC: 240 V
VDC: 50 V

Circuit Breakers, Thermal, Series Trip, Silver, Operating Voltage 240 VAC, Operating Voltage 50 VDC, 40A Current Rating, Potter & Brumfield W23-31 • TE Internal Description: W31-X2M1G-40=W23/W31 • ...

See the other products
TE CONNECTIVITY
differential circuit breaker
differential circuit breaker
NG125

Primary current: 30 mA - 125,000 mA

... protection class is A type with a sensitivity of 30mA and a voltage independent technology. This product protects against short circuit, cable overload, electrical shock by indirect contact and fire hazards. This product ...

See the other products
Schneider Electric
digital circuit breaker
digital circuit breaker
GFCI

Rating: 60 A

... Eaton’s BR two-pole ground fault circuit breaker boasts an improved series rating, offering additional combinations up to 60 A. And with higher interrupts and #3AWG lugs that reduce wiring costs, the ...

SF6 circuit breaker
SF6 circuit breaker
HVS-63S

Primary current: 7,150, 6,900 A
VAC: 24 kV

System type generator circuit-breaker (GCB) with innovative built-in monitoring The HVS-63S GCB with SF6 interrupting technology for short-circuit currents up to 63 kA and rated currents ...

generator circuit breaker
generator circuit breaker
HEC 10 series

Primary current: 29,000, 20,000 A
VAC: 31.5, 33 kV

... rated generator-source short-circuit breaking current characterized at contact separation by a degree of asymmetry of 130 percent with the assigned a.c.component (alternating current) of the rated generator-source short-circuit ...

live-tank circuit breaker
live-tank circuit breaker
EDF SK 1-1

Primary current: 2,500 A
VAC: 72.5 kV

Well proven circuit breaker based on established design, assembled and tested for rapid installation The EDF SK is a live tank SF6 Auto-Puffer™ circuit breaker. It has ...

air-operated circuit breaker
air-operated circuit breaker
AE-SW series

Primary current: 1,000 A - 6,000 A
VAC: 690 V

This kind of breaker is used as the main power breaker of the supply such as buildings, factories and ships etc. and satisfy the various needs.

See the other products
MITSUBISHI ELECTRIC AUTOMATION
live-tank circuit breaker
live-tank circuit breaker
3AP series

Primary current: 4,000, 2,500, 5,000 A
VAC: 72.5 kV - 800 kV

... tank circuit breakers for applications from 72.5 kV to 800 kV, up to 80 kA, suitable for all different types of applications, in extreme temperatures or earthquake regions. Depending on the requirement, ...

See the other products
Siemens High-voltage – Power transmission
thermal-magnetic circuit breaker
thermal-magnetic circuit breaker
TM12-MSM series

Primary current: 10, 16, 15 A
VAC: 240 V
VDC: 28 V

• Metal switch non-illuminated and illuminated • Quick connect terminals 6.3 x 0.8 mm / screw terminals • Uninterruptible power supply • Power tools • Household appliances

See the other products
SCHURTER
thermal circuit breaker
thermal circuit breaker
CTI 15

Primary current: 2.5, 1.6 A

... current [A] - 28 A Packing format - Multi pack Product group - Contactors and motor starters Product Name Description - Circuit breaker Quantity per packing format - 23 pc REACH Candidate List substances ...

dead-tank circuit breaker
dead-tank circuit breaker
DT series

Primary current: 1,200 A - 5,000 A
VAC: 72,000 V - 550,000 V

The actual circuit breaker is essential toward substation protection along with safety. The actual great efficiency Alstom Grid Dead Tank circuit breaker, designed with ...

See the other products
Alstom Grid
thermal-magnetic circuit breaker
thermal-magnetic circuit breaker
RECmaxMP series

VAC: 240, 415 V
Rating: 6 A - 63 A

... RECmax MP series are motorized circuit breakers that can be linked remotely.They function as protection against shortcircuit and overload, and can also be used as a circuit breaker. ...

differential circuit breaker
differential circuit breaker
RECmaxLPD series

Primary current: 6 A - 63 A
VAC: 240, 415 V

... device with circuit breaker and ultra-immunized earth leakage protection. Programmable unit with display, which measures leakage currents (earth leakage protection), and orders the disconnection or ...

overload circuit breaker
overload circuit breaker
MT series

Primary current: 6 A - 63 A
VAC: 240, 415 V

The motorized circuit breakers of the MT Series can be associated remotely. They protect against short-circuits and overloads, but are also used as a circuit breaker. ...

thermal-magnetic circuit breaker
thermal-magnetic circuit breaker
PR series

Primary current: 80 A - 125 A
VAC: 230 V - 400 V

Circuit breakers PR121 - PR122 - PR123 - PR124 series 1- to 4-pole circuit breakers, from 80 to 125 A. B and C curves.

magnetic circuit breaker
magnetic circuit breaker
SNAPAK® series

VAC: 30 V
VDC: 30 V
Rating: 0.1 A - 30 A

... contacts and minimizes arcing. SNAPAK® circuit protectors are UL Recognized as supplementary protectors per UL STD. 1077, CSA Certified as supplementary protectors per CSA STD. C22.2 No. 235, TUV Approved as circuit ...

See the other products
Sensata Technologies
hydraulic-magnetic circuit breaker
hydraulic-magnetic circuit breaker
209 series

Primary current: 0.1 A - 100 A
VAC: 480, 240, 277 V
VDC: 125, 160 V

The 209, E-Frame circuit breaker combines power switching with accurate, reliable circuit protection in a compact single or multi-pole unit. The unit is ideal for branch circuit ...

See the other products
Sensata Technologies
hydraulic-magnetic circuit breaker
hydraulic-magnetic circuit breaker
LEJ series

Primary current: 2 A - 20 A
VAC: 240, 277 V

The LEJ/LEJA series circuit breaker meets the evolving demand for the high-performance protection of critical data center and telecommunications applications requiring up to 277VAC per pole, UL 489 listing ...

See the other products
Sensata Technologies
arc protection circuit breaker
arc protection circuit breaker
BJ-AFCI

air-operated circuit breaker
air-operated circuit breaker
DZ47

Primary current: 1 A - 63 A
VAC: 400, 230, 415 V
VDC: 10 V - 10 V

DZ47 AC MCB circuit breaker series is used in lighting distribution system or motor distribution system for protecting overload and short-circuit condition. The product is light in weightreliable ...

exhibit your products

& reach your clients in one place, all year round

Exhibit with us
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.