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    12kV Vacuum Circuit Breaker, 50Hz, 630A

    $2,730.95
    SKU: ATO-VCB-12B
    Economical price vacuum circuit breaker with 12kv rated voltage. Vacuum circuit breaker voltage range is 11kv to 40kv. 12kv vacuum circuit breaker has particular advantages for use in networks where there is a high switching frequency in the working current range.

    3 amp 1 pole Miniature Circuit Breaker

    $57.49
    SKU: ATO-MCB-1P03
    Factory price single pole miniature circuit breaker is an electrical switch with a 3A current rating that offers optimum and efficient protection for branch and control circuits. The 6kA rated short-circuit breaking capacity of this 1 pole mini MCB breaker makes it ideal for commercial and industrial applications.

    3 amp 2 pole Miniature Circuit Breaker

    $69.69
    SKU: ATO-MCB-2P03
    3 amp 2 pole 6kA miniature circuit breaker (MCB) complies with IEC standard, with C trip characteristic to meet protecting requirements. This mini circuit breaker has a compact structure, DIN rail installation, reliable performance, good interrupt capacity, and safety in use.

    3 Pole Molded Case Circuit Breaker, 100A/ 150A/ 200A/ 250A

    $139.14
    SKU: ATO-MCCB-2503P
    3 pole molded case circuit breaker at lower price, easy to install. Mccb breaker is capable of protecting the system against short circuit current up to 50kA. It has 1500 times' electrical life and 8500 times' mechanical life. Molded circuit breaker is used to distribute electric energy and protect circuits and electrical equipment from overload or short circuit.

    3 Pole Molded Case Circuit Breaker, 250A/ 300A/ 350A/ 400A

    $307.14
    SKU: ATO-MCCB-4003P
    3 pole molded case circuit breaker for sales online. Mccb circuit breaker with rated operating voltage 380/415V AC, 50Hz/ 60Hz, operating temperature from -25℃ to 50℃. The 400 amp mccb can be used for conversion of line and infrequent starting motor.

    4 Pole Molded Case Circuit Breaker, 50A/ 60A/ 75A/ 100A

    $92.86
    SKU: ATO-MCCB-1004P
    Factory price molded case circuit breaker online for sale. 4 pole mccb with rated current 50A/60A/75A/100A for selection, rated voltage 380/ 415VAC, 50Hz/ 60Hz. Molded case breaker offers stable and reliable function, beautiful appearance, small size and long service life.

    11kV Vacuum Circuit Breaker

    $3,377.85
    SKU: ATO-VCB-11
    Cheap 11kv vacuum circuit breaker for sale online. The rated current is 630A, 1000A, 1250A, 2500A for your choice. 11kv vcb for indoor, it is applicable in occasions with frequent operations, acting to protect and control line and electric apparatus.

    125A DC Circuit Breaker, 1/2/3/4 Pole

    $109.15
    SKU: ATO-DCCB-125A
    Economical price DC circuit breaker with 125 amp for sale. The protection level of pv circuit breaker is IP20. Electrical circuit breaker is available for installation in standard busbars. 125 amp DC circuit breaker often used in overload protection device, power transfer switch and control appliance.

    15kV Vacuum Circuit Breaker

    $3,685.21
    SKU: ATO-VCB-15
    Lower cost 15kv circuit breaker with vacuum suit for indoor. Electrical vacuum breaker rate current is 1000A, 2500A, 3150A. 15kv breaker rated short circuit switching current is 50kA, 80kA, 100kA.

    16 amp 3 pole Miniature Circuit Breaker

    $70.69
    SKU: ATO-MCB-3P16
    16 amp 3 pole miniature circuit breaker meets the IEC standard for rail mounting and has a 6kA rated short-circuit breaking capacity. This 3P mini MCB has a C curve trip characteristic and is designed for short circuit and overload protection in the AC 50Hz circuit, 230/400V voltage.

    25kV Vacuum Circuit Breaker

    $3,702.41
    SKU: ATO-VCB-25
    Vacuum circuit breaker for sale online, with 25kv rated voltage to be the protection and control unit. Rate current of vcb circuit breaker is 630A, 1250A, 2500A, 3150A. Acting to protect and control line is the function of vcb.

    33kV Vacuum Circuit Breaker

    $11,783.85
    SKU: ATO-VCB-33
    33kv vacuum circuit breaker with cheap price for sale, rated current is 630A, 1000A, 2000A, 2500A. Vacuum circuit breaker uses widely, it can be a flexible unit to protect line equipment with short-circuit situation or frequent operations. 33kv vacuum circuit breaker specifications are as follow form.

    35kV Vacuum Circuit Breaker

    $11,786.52
    SKU: ATO-VCB-35
    Good price vacuum circuit breaker with 35kv rated voltage for sale online. Rated current is 630A, 1250A, 1600A, 3150A. Over voltage protection is vacuum circuit breaker function. VCB breaker parts with high quality material, you can buy with satisfaction, use at ease.

    4 amp 1 pole Miniature Circuit Breaker

    $57.49
    SKU: ATO-MCB-1P04
    4 amp single pole miniature circuit breaker with standard ratings of 6kA rated short-circuit breaking capacity at 230/400V AC single voltage, standard 35 mm DIN rail mounting. The mini MCB circuit breaker has a c curve trip characteristic to suit most applications.

    4 amp 2 pole Miniature Circuit Breaker

    $68.99
    SKU: ATO-MCB-2P04
    Factory price 4 amp 2 pole miniature circuit breaker (MCB) is a micro electrical switch that meets IEC standard to provide supplementary protection for the electrical equipment with 6kA rated short circuit breaking capacity, C curve trip characteristic, sand afety used in DIN rail mounting.

    16 amp 4 pole Miniature Circuit Breaker

    $79.29
    SKU: ATO-MCB-4P16
    Economical price 16 amp 4 pole miniature circuit breaker complies with the IEC standard and is designed for mounting on a standard rail. This C16 mini MCB features a 6kA short-circuit interrupting capacity, ensuring reliable protection against short circuits and overloads in an AC 50Hz circuit.

    160A DC Circuit Breaker, 1/2/3/4 Pole

    $123.68
    SKU: ATO-DCCB-160A
    160A DC circuit breaker at affordable price for sale online. 250V, 500V, 750V, 1000V rated working voltage can be chosen. Smart circuit breaker has overload long delay protection and short-circuit instantaneous protection functions. Working temperature of PV DC circuit breaker between -25 ℃ and 50 ℃.

    20 amp 3 pole Miniature Circuit Breaker

    $71.39
    SKU: ATO-MCB-3P20
    3 pole C20 miniature circuit breaker (MCB) designed for rail mounting, is rated for a 230/400V AC supply and offers a short-circuit breaking capacity of 6kA. This 20 amp mini circuit breaker provides reliable short-circuit protection and features a C curve trip characteristic for optimal performance in circuits with moderate inrush currents.

    6 amp 1 pole Miniature Circuit Breaker

    $55.19
    SKU: ATO-MCB-1P06
    Single pole C6 MCB miniature circuit breaker is an electrical switch that provides an electrical circuit from damage caused by overload or short circuits, with a 6 amp current rating, used in AC 50Hz, 230/400V with a 6 kA short circuit withstand rating.

    6 amp 2 pole Miniature Circuit Breaker

    $65.79
    SKU: ATO-MCB-2P06
    Cost-effective double pole C6 miniature circuit breaker with 6 amp rated current, C curve trip characteristic, DIN rail mounting, meets IEC standard. This MCB breaker can safely be used in AC 50Hz, 230/400V with a 6 kA rated short-circuit breaking capacity, providing an electrical circuit from damage caused by overload or short circuits.

    A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuits. Its basic function is to interrupt current flow after protective relays detect a fault. The circuit breaker is an electrical safety device, a switch that automatically interrupts the current of an overloaded electric circuit, ground faults, or short circuits. Circuit breakers "trip", shut off, and current flow after protective relays detect a fault.

    ATO.com offers four types of vacuum circuit breakers, molded case circuit breakers, miniature circuit breakers and DC circuit breakers:

    • The miniature circuit breakers are 35mm DIN rail mounted and module width of only 18mm per pole. They are manufactured in 1, 2, 3, and 4 pole versions of different currents from 1A to 63A.
    • Various vacuum circuit breakers with 11kV, 12kV, 15kV, 25kV, 33kV, 35kV, 40kV rated voltage are provided. The rated current of the VCB vacuum circuit breaker is 630A, 1250A, 2000A, 2500A, 3150A.
    • MCCB breaker has 2 pole, 3 pole, 4 pole for selection, and wide range rated currents from 20A to 400A are available.
    • DC circuit breakers have 63A /80A/100A/125A rated current for selection. 1 pole, 2 poles, 3 poles and 4 poles can be selected.

    What are circuit breakers?

    A circuit breaker is a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The division of high and low voltage boundaries is relatively vague. Generally, those above 3kV are called high-voltage electrical appliances.

    Circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, and automatically cut off the circuit when they are severely overloaded, short-circuited, or under-voltage. Its function is equivalent to a fuse-type switch. Combination with overheating and underheating relays, etc. Moreover, there is generally no need to change parts after breaking the fault current.

    Circuit breaker advantages

    After it breaks for fault, it can be reset manually, instead of changing the component, unless it needs to be repaired after cutting off the large short circuit current.
    It has two segments of protective functions, i.e. the long-time delay release with inverse-time characteristics and instantaneous current release, which are used as overload and short-circuit protections respectively.

    Many breakers have intelligent characteristics. Besides protection, they also have functions like electric quantity measurement, fault recording and communication interface to realize centralized monitoring and management of distribution devices and systems.