140G-K3K4-D30
This circuit breaker is constructed for four poles and operates with 300 A of rated current. It can handle insulation voltage ratings of up to 1000 volts and withstand impulse voltages of 8 kV. The de
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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-KTH4-D40
This four-pole circuit breaker is rated for a maximum current of 400 A and operates at a rated insulation voltage of 1000 V. It withstands impulse voltages of up to 8 kV and weighs 9.15 pounds. It has
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140G-M0H3-D63
With an interrupting capacity rated at 100 kA, this circuit breaker provides excellent protection against fault conditions. The device operates effectively within a current range of up to 630 A and su
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140G-M0X4
This molded case circuit breaker is specified with a frame type of M. The 140G-M0X4 model provides fixed protection and operates in conditions requiring high dependability. It supports mechanical oper
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140G-M5F4-D80
This circuit breaker features four poles and offers a current rating of 800 A. Its interrupting rating is set at 50 kA, with a rated insulation voltage of 1000 volts, making it suitable for high-volta
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140G-M6K4-D80
Designed with an M frame type, the 140G-M6K4-D80 circuit breaker operates at a current range of 800 A. It has a rated insulation voltage of 1000 volts and can withstand impulse voltages of 8 kV. With
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140G-I2C3-C60
This circuit breaker utilizes both fixed thermal and fixed magnetic protection types. Capable of handling current inputs up to 60 A, it offers a rated insulation voltage of 800 V. The unit withstands
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140G-J0I3-D25
The 140G-J0I3-D25 features a J frame and is suitable for circuits requiring a 250-Amp capacity. It has an insulation voltage rating of 1000 volts and can handle impulse withstand voltages of up to 8 k
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140G-K3H3-D30
This circuit breaker operates with 300 A of rated current and is equipped with electronic LSI protection. Designed for high-voltage applications, it has a rated insulation voltage of 1000 Volts and wi
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140G-KTK3-D40
This circuit breaker operates with a type K frame and features a rated current of 400 A. The rated impulse withstand voltage is 8 kV, which provides additional safety during transient conditions. The
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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.