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Circuit Breakers

Circuit Breakers
Circuit Breakers
A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by excess current.

Its basic function is to interrupt current flow after a fault is detected, typically resulting from an overload or short circuit. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset to resume normal operation.

Classifications of circuit breakers can be made based on voltage class, construction type, interrupting type, and structural features. Circuit breakers also come in a variety of sizes: from small devices that protect low-current circuits or individual household appliances, up to large switchgear designed to protect high voltage circuits feeding heavy machinery.

S200 Series Image
  • Supplemental Protector
  • Use as Overcurrent Protection
  • UL 1077 - E76126
  • B, C, D, K Trip Characteristics
  • AC Rated
The S200 Series of miniature circuit breakers from ABB offer a compact solution to your protection requirements. These miniature breakers are current limiting, DIN rail mounted and can offer a good equivalent to fused systems. Application specific trip curves of B, C, D and K, provide maximum circuit protection. A wide range of accessories will complete the installation including shunt trips, auxiliary contacts, alarm contacts, undervoltage release, busbars and much more.
  • 480Y/277 VAC
  • 0.5 to 63 Amps
  • Line and Load Terminals Included
  • Ring Tongue Styles Available
  • Finger Safe Terminals
  • Optional Front Mounting Kit
SU200M Series Image
  • Available with Variable Depth Handle Mechanism
  • Fast Breaking Time (2.3 – 2.5 ms)
  • Wide Range of Accessories
  • Multi-Function Terminals
  • Bus Connection System
  • Finger Safe Terminals
  • DIN Rail Mounting
The SU200M miniature circuit breakers offer a compact solution for protection requirements. The SU200 series devices are current-limiting according to UL 489 and DIN rail mounted. SU200M MCBs come in up to 3 trip curves to provide maximum circuit protection.
R Series Image
  • Supplemental Protector
  • Use as Overcurrent Protection
  • UL 1077 - E301611
  • B, C, D Trip Characteristics
  • Finger Safe Terminals
The R Series of miniature circuit breakers from Altech offer a compact solution to your protection requirements. These miniature breakers are current limiting, DIN rail mounted and can offer a good equivalent to fused systems. Application specific trip curves of B, C, and D, provide maximum circuit protection. A wide range of accessories will complete the installation including shunt trips, auxiliary contacts, alarm contacts, undervoltage release, busbars and more.
  • 480Y/277 VAC
  • 0.5 to 63 Amps
  • Line and Load Terminals Included
  • Positive Trip Indicator
EP100 Series Image
  • Contact Position Indication (Red/Green) with Option to Lock Toggle in OFF Position
  • Complete Range of UL489 and UL1077 Miniature Circuit Breakers up to 63A
  • Standard Rating of 10kA at 480Y/277 VAC and 240/120VAC
  • Module Width of Only 0.71 in (18 mm) per Pole
  • Suitable for Branch Circuit Device Protection
ElfaPlus circuit breakers and supplementary protectors provide several advantages which are important to OEMs and global players in the electrical contractors market:
  • Better protection - ElfaPlus supplementary protectors and miniature circuit breakers limit let through current, providing faster separation of the component from the fault, thereby reducing system damage.
  • Reduction of nuisance tripping - Available with different trip characteristics to meet the system needs: B, C and D curves, depending on the model.
  • Reliability - Each EP miniature circuit breaker has an endurance of 10000 operation cycles and voltage withstand of 6000V impulse rating.
  • More selection - More ratings compatible with low-power electronic circuits are available in the range from 0.5 to 10 A.
  • Simple installation - The ElfaPlus products mount easily onto a 35 mm DIN mounting rail.
  • Reverse feeding - Reverse feeding of line power is permitted.
TMAX Series Image
  • Branch Circuit Protector
  • UL 489 Listed E93565
  • 15 ~ 2500 Amps
  • 240/277/480/600Y VAC
  • 250/500/600 VDC
The Tmax Series of circuit breakers from ABB offer a full range of molded case circuit breakers that meet the UL 489 and CSA C22.2 Standards. Covering current ratings between 15 A and 2500 A and interrupting ratings, at 480 V AC, up to 150 kA. A wide range of accessories will complete the installation including shunt trips, auxiliary contacts, undervoltage release, and more.
V-EA Series Image
  • Manual Motor Controller
  • UL/CSA Rated
  • UL 508 Listed E137938
  • B, C, D, E, G, Z Trip Curves
  • Finger Safe Terminals
The V-EA Series of miniature circuit breakers from Altech offer a compact solution to your protection requirements. These miniature breakers are current limiting, DIN rail mounted and offer a good equivalent to fused systems. Application specific trip curves of B, C, D, E, G and Z, provide maximum circuit protection. A wide range of accessories will complete the installation including shunt trips, auxiliary contacts, alarm contacts, undervoltage release, busbars and much more.
  • 480Y/277 VAC
  • 0.3 to 63 Amps
  • Line and Load Terminals Included
  • Ring Tongue Styles Available
L Series Image
  • Branch Circuit Protector
  • Use as Overcurrent Protection
  • UL 489 - E305318
  • C, D Trip Characteristics
  • DC Versions Available
The L Series of miniature circuit breakers from Altech offer a compact solution to your protection requirements. These miniature breakers are current limiting, DIN rail mounted and can offer a good equivalent to fused systems. Application specific trip curves of C and D, provide maximum circuit protection. A wide range of accessories will complete the installation including shunt trips, auxiliary contacts, alarm contacts, undervoltage release, busbars and more.
  • 240/480Y/277 VAC
  • 0.2 to 63 Amps
  • Finger Safe Terminals
  • Positive Trip Indicator
  • Line/Load Reversible
FAZ Series Image
  • Ring-Tongue Terminals Available
  • Very Broad Product Range
  • Current Limiting Device
  • Worldwide Approvals
Moeller’s FAZ Circuit breakers are available in one, two and three pole configurations and up to 20 different current rating ranging from 0.5A to 63A. Six different trip characteristics including B, C, D, K, S and Z curves give you the ability to configure the exact protection scheme you require. Devices can be used in applications up to 480V AC with short circuit ratings of 10kA. As with most products from Moeller, FAZ breaker terminals provide finger and back-of-hand protection to guard against accidental contact with live parts. All breakers mount on standard 35mm DIN-rail. Bus connectors and feeder terminals facilitate mounting and wiring of multiple miniature circuit breaker arrays in control panel assemblies.
C Series Image
  • Ranges from 15-2500 amperes
  • High-speed "blow-open" action
  • Available for 600 VAC or 250 VDC systems
  • Current ratings up to 2500A
  • Outperform calculations listed in IEEE
Eaton's Electrical Sector, under the Eaton brand, offers the widest variety of molded case circuit breakers available today. Designed for electrical and machinery OEMs serving a range of industries and applications, these proven designs incorporate the latest in innovation with the high reliability that has been our hallmark since the advent of the circuit breaker in the 1920s. The Series C family includes thermal-magnetic breakers, electronic trip breakers, molded case switches, motor circuit protectors, and specially designed breakers for engine generator, DC and mining applications.
XT Series Image
Tmax XT molded case circuit breakers offers extraordinary flexibility and completeness of range to simplify system designs and reduce inventory and procurement costs. With current ratings up to 250A and a voltage rating of 600V, both alternating (AC) and direct (DC) current in the same breaker. This combined with extended breaking capacities, up to 200kA, gives SACE Tmax XT molded case circuit breakers the ability to cover a full range of applications.
For the most cost effective solution, the Tmax XT1 and XT3 provide the ability to purchase only what you need without paying for extra bells and whistles. They offer a thermal magnetic trip unit up to 225A and breaking capacities up to 100kA. Tmax XT2 and XT4 offer an extraordinary range of trip unit flexibility with adjustable thermal magnetic trip units with an adjustment range of 70%. They also offer a full line of electronic trip units with multiple fault protection options and up to 40% adjustability range. Finally, to ensure your design will fit customer requirements around the globe, the Tmax XT is globally certified UL/CSA/IEC with a wide range of naval registrations and much more.
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