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.
Circuit breakers are used in industrial facilities to protect circuits and electrical machinery.
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.
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.
 |
  |
Switch type circuit breaker with under-voltage protection 10 - 16 A, 115 - 230 V | UP1 SCHURTER
Description – 2-pole switch with undervoltage release and restart protection – Remote trip version – Rocker and push...
 |
 |
Thermal circuit breaker CROUZET
For over 40 years now, Crouzet Automatismes has been developing and producing thermal, arc detection, differential, remote control (RCCB) and electronic circuit-breakers, as well...
 |
 |
Air circuit breaker MITSUBISHI ELECTRIC EUROPE
Switchgear – SUPER AE Built for the global demands of the 21st century The SUPER AE air circuit breaker family consists of models from 1000...
 |
  |
Air circuit breaker 630 - 6 300 A | SENTRON 3WL SIEMENS Low-Voltage & Products
Flexibly Applicable and Communication-Capable 3WL air circuit breakers offer a very flexible applicability and integrated communication capability. They optimally meet the increased requirements placed upon air circuit...
 |
 |
Circuit-Breakers for Motor Protection Series 8523/8 Explosion protection to CENELEC IEC Can...
 |
 |
Motor circuit breaker 0.1 - 16 A | PKZM 01 Eaton Moeller
Pushbutton actuated motor-protective circuit-breaker up to 16 A Back in the range at last! The new PKZM 01 motor-protective circuit-breakers for motors up to 16 A are ideally suited for small machines and applications...
 |
 |
The Compact NSX DC range is designed for DC voltages from 24 to 750 V and offers: A wide selection of models suited to many applications (1 to 4...
 |
 |
Motor circuit breaker 32 - 100 A | J7MN Omron Europe
J7MN is a range of motor-protection circuit breakers from 0.10-100A The J7MN motor starters protect motors against thermal overload and short circuit. The Motor protection...
 |
 |
Circuit breaker max. 200 kA | WWS series MITSUBISHI Automation
The moulded-case circuit breakers of the Mitsubishi breaker series are amongst the smallest compact circuit breakers in the world with electronic overload indication of this kind. The system is...
 |
 |
Circuit breaker 5 - 250 A | WS-V series MITSUBISHI ELECTRIC AUTOMATION
Mitsubishi 'WS-V' Series Molded Case Circuit Breakers The main WS-V range is designed to IEC standards * and is intended to service a world market demanding ever higher interrupting capacity in smaller packages. Fixed and Adjustable Types in sizes from 5A up to 250A are available,...
 |
 |
Miniature circuit breaker GEWISS
MT - Miniature circuit breakers - MT 45 - C characteristic - 4500 A (EN 60898) - 6 kA (EN 60947-2) - MT 45 - B characteristic - 4500 A (EN 60898) - 6 kA (EN 60947-2) -...
 |
 |
High voltage circuit breaker SIEMENS Energy
Circuit breakers are the central part of air-insulated (AIS) and gas-insulated (GIS) switchgear. High-voltage circuit breakers are mechanical switching devices which connect and break current circuits (operating...
 |
 |
High voltage live-tank circuit breaker max. 800 kV | GL series Alstom Grid
Based on our experience with the S1, HGF and FXT types of circuit breakers, the improved GL300 series is safer and more reliable. It offers a new generation spring operating mechanism and tie rod that enable quick and easy onsite installation. This range of live tank circuit breakers can be used...
 |
 |
Hydraulic-magnetic circuit breaker AM1P series Eaton Count Control Products
Using a parallel wiring configuration, the AM1P delivers 200 amperes in a 2-pole design and 250 amperes in a 3-pole design. In addition, the AM1P employs a proprietary technology known as PCE or Precision...
 |
 |
Load-break switch 200 - 1 200 A, 2 400 - 6 900 V | 1592 Allen Bradley
Bulletin 1592 Fused and Non-Fused...
 |
 |
Modular circuit breaker 1492-SP series ROCKWELL AUTOMATION
Bulletin 1492-SP Energy Limiting Supplementary Protector/Miniature Circuit Breakers protect equipment, systems,...
 |
 |
Remote control circuit breaker 1.5 A, 230 V | ETIMAT11 RC ETI
ETIMAT11 RC is a miniature circuit breaker with remote control mechanism. ETIMAT11 RC provides following advantages: remote switching with simultaneous...
 |
 |
Load-break switch 12 kV, 630 A | FLN36-12D/630-20, FLRN36-12D/T125-31.5 Chint Electric Co.,Ltd.
FLN36-12D/630-20 SF6 Switch / FLRN36-12D/T125-31.5 SF6 Switch-fuse Combination Application: in the system of 50Hz, 12kV for making and breaking of load current, over-load current and short-circuit current to control and protect the circuit and transformer, etc. Standards: IEC 60265, IEC 60420 Features: Indication of the active contact to show the operation status of the switch. High...
 |
 |
Load-break switch: metal enclosure 40 - 1600 A | SAFEBLOC cefem
The CEFEM steel SAFEBLOC switch Disconnector is a cut-off and lock device. It complies with standards and regulations to ensure the safety of operators in industry, where the risk is permanent. The SAFEBLOC enclosure includes a position indicator (ON / OFF or I...
 |
 |
Description Main Features Protection of electric circuits + operation and protection of motors The MPW Motor-protective Circuit-breakers are a compact solution for the protection of electric circuits, and operation and protection of motors up to 60cv...
 |
 |
The RMSI25, RMSI63 circuit-breakers are compact circuit-breakers for currents up to 63 A. The devices are used for switching and protecting motors or other loads. They are fitted with instantaneous overcurrent releases and inverse-time delayed overload relay. Circuit-breakers and contactors can be combined to form fuseless starter combinations. The RMSI25, RMSI63 circuit-breakers...
 |
 |
Motor circuit breaker max. 660 V, 0.1 - 25 A | EDZMO series GREEGOO ELECTRIC CO LTD
EDZMO Motor Protective Circuit Breaker is applicable for the circuit of Ac 50/60Hz, rated insulation voltage 750V, rated operating voltage up to 660V, rated...
 |
 |
Power circuit breaker CT 1000 Schaltbau
With the CT contactor series Schaltbau is introducing a new and innovative contactor concept to the market: power contactors in a completely new style and design, specially developed for the sophisticated requirements of the railway industry. The outstanding technical feature of this new product is the innovative combination of electromagnetic and permanent-magnetic blowout technology for electric...
 |
 |
Miniature circuit breaker 2 - 63 A, 230 - 400 V | S7 series Yueqing Hean Electrical Co., Ltd.
Miniature circuit breaker (MCB) S7 series is particularly suitable for any circuit protection of illumination and distribution in civil and industria use....
 |
 |
Miniature circuit breaker 50 series Werner Electric GmbH
MCB Keywords: circuit breaker, power breaker, circuit breaker trip, miniature circuit breaker, load breaker, short circuit breaker, mcb circuit breaker, 10ka mcb, mcb manufacturers, german made mcb, 4.5 KA mcb, 6 KA mcb WERNER'S 50 series miniature circuit breakers provide the customer a comprehensive efficient, reliable protection of equipments, cables and installations in...
 |
 |
Motor circuit breaker 25 A Iskra Sistemi
Versions: - MS25 – with thermal and magnetic releases - MST25 – with a thermal release - MS20 - with thermal and magnetic releases for single-phase consumers - MST20 – with a thermal overload release for single phase consumers Manual control: -...
 |
 |
Modular differential residual current circuit breaker REC2 CIRCUTOR
REC2 allows us to the reconnection of our automatic earthleakage protection through successive time sequences defined in the old and reliable model but...
 |
 |
Medium-voltage vacuum circuit breaker max. 12 kV | Calix series CG Power Systems
12KV VCB (CALIX) Product Overview The `Calix` series was designed to provide compact, reliable switching & protection solutions for MV distribution network. With over 50,000 VCBs in operation...
 |
 |
Load-break switch 16 - 125 A Mersen
Ferraz Shawmut LBS load break disconnect switches have been designed for today's industrial control systems. The LBS switches allow you to safely turn power to your panel on...
 |
 |
Load-break switch Kinto Electrical Apparatus Co., Ltd.
Load break switch: switchblade with integral arc-strangler load breaking device for hinge-style...
 |
 |
Motor circuit breaker 0.16 - 32 A | ESM, ESB series ITALWEBER
MOTOR-PROTECTIVE CIRCUIT BREAKERS SERIES “ESM” - “ESB” When protecting or controlling three phases...
 |
 |
Motor circuit breaker 0.1 - 32 A | M FANOX ELECTRONIC
Manual motor starters - M • Overload and short-circuit protection. • Overload range...
 |
 |
Circuit breaker Tyco Electronics Antennas
Circuit breakers offer ratings from 20mA to 50A. Thermal types...
 |
 |
Thermal circuit breaker TE Circuit protection
Thermal circuit breakers are available with rocker, push-pull,...
 |
 |
Load-break switch: DIN-rail mount GIOVENZANA International
Regolus switch disconnectors Current rating from 25A up to 160A,...
