140G-K6K4-D40
This Allen-Bradley circuit breaker operates at a voltage rating of up to 1000 volts. Additionally, it has a rated current range of 400 amps. The unit provides a rated impulse withstand voltage of 8 kV
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Allen Bradley 140G MCB
The Allen Bradley 140G molded case circuit breakers are suitable for a wide range of applications in low-voltage 3-phase power systems. 140G series circuit breakers can be reverse-fed. They provide overcurrent protection to conductors and other equipment, and they can be used as the main disconnecting devices for control panels. The 140G circuit breakers can also be used for branch circuit protection or as feeder breakers.
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Browse 140G MCB
Browse available units in our catalog of 140G MCB.
140G-KC6H3-D30
This circuit breaker, designed with a KC frame, supports a rated current of 300 Amps. It can manage insulation voltage levels of up to 1000 V and withstand impulse voltages of 8 kV. The unit weighs 7.
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4.6
140G-KC6X3
This breaker model features a KC frame and is tailored for a current rating limited to the frame itself. The rated insulation voltage stands at 1000V, with an impulse withstand voltage of 8 kV. The pr
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4.8
140G-M0I4-D80
This 140G model incorporates a frame size categorized as M and has four poles. It provides a current range of 800 Amps, with a rated insulation voltage of 1000 volts. Capable of withstanding impulse v
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4.4
140G-M5F3-D63
Operating within a current range of 630 Amps, the 140G-M5F3-D63 maintains a rated insulation voltage of 1000 Volts and offers an impulse withstand rating of 8 kV. Weighing 26.68 pounds, this circuit b
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4.5
140G-M5H4-D63
The molded case circuit breaker operates with a current range of 630 A and has a frame size classified as M. It functions effectively at a rated insulation voltage of 1000 volts and can handle impulse
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4.7
140G-M5I3-D63
As part of the M-frame series, this breaker operates effectively within a current range of 630 A. It has a rated insulation voltage of 1000V and withstands impulse voltages of up to 8 kV. Weighing 26.
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140G-M6H4-D60
This molded case circuit breaker supports a maximum current range of 600 A and operates with a rated insulation voltage of 1000 V. It withstands impulse voltages of up to 8 kV. Composed of four poles,
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5.0
140G-MTH4-D60
Featuring a robust frame classified as M, this circuit breaker operates within a current range of 600 Amps. It is equipped with a rated insulation voltage of 1000 volts and can withstand impulse volta
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4.8
140G-MTK3-D80
This unit operates within a maximum current range of 800 A and includes a trip unit for interrupting purposes. It is suitable for rated insulation voltages of 1000 V and withstands impulse voltages up
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About 140G MCB
The Allen-Bradley/Rockwell Automation 140G MCB series is a series of molded case circuit breakers. According to the National Electrical Manufacturers Association (NEMA), a circuit breaker is a device designed to open and close a circuit by non-automatic means, and to open the circuit automatically at a predetermined overcurrent level without injury to itself when it is properly applied within its rating. The 140G MCB circuit breakers employ different methods to control the operating mechanisms. These methods include stored energy operation, dependent manual/power operation, and independent manual/power operation. When breakers in the 140G MCB family encounter an overcurrent, they can use instantaneous, inverse time delay, and definite time delay overcurrent releases. All these breakers from the Allen-Bradley 140G series of molded-case circuit breakers come with a frame rating of 125 Amps and an interrupting capacity that goes from 25 to 65 kA.
The Allen-Bradley 140G MCB series of circuit breakers are CCC, UL, and CSA certified since they comply with international standards such as the UL, CSA, and IEC standards. Since these circuit breakers have molded cases, they provide short circuit and thermal overcurrent protection by using either mechanical or electronic means. Note that the mechanical means use heater elements to detect the current flow and model the associated heat generated by the current. Additionally, molded case circuit breakers in this family feature either fixed or adjustable trip units. Whether they use fixed or adjustable magnetic and thermal trip units, the motor current rating of these circuit breakers should be less than or equal to 250% of the motor’s full-load ampere rating, or less than or equal to 300% for motors with a current of less than or equal to 100 amperes if the circuit trips on startup. Also, a circuit breaker in the 140G MCB series can be used with a motor current rating of less than 400% for motors with a current rating of more than or equal to 100 Amps if the circuit breaker trips on startup. The safety features of these breakers are capable of preventing accidents such as fires and explosions due to over-current or the overheating of conduits.