140G-K0F3-D30
This circuit breaker features adjustable thermal and magnetic protection options, making it versatile for various electrical system applications. It operates efficiently at 300 A of rated current and
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4.9
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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-KTF4-D40
This breaker model has four poles and includes a current handling capability of up to 400 A. The rated insulation voltage reaches 1000 volts, providing ample safety for demanding tasks. Furthermore, i
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4.7
140G-M5H3-D60
This unit operates within a current range of 600 amps and is rated for insulation up to 1000 volts. The 140G-M5H3-D60 also withstands impulse voltages of 8 kV. Weighing 26.68 pounds, it provides stabl
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4.7
140G-N6I3-E12
This breaker features an N frame size and operates at a rated insulation voltage of 1000 volts. It can endure impulse voltages rated at 8 kV, making it suitable for varied applications. The unit weigh
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4.6
140G-N6I3-E12-Z1
Rated for 1200 Amps, this device features an interrupting rating of 60 kA and operates within a rated insulation voltage of 1000 volts. Its impulse withstand voltage is up to 8 kV. The design weighs 2
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4.4
140G-KTF3-D30
This molded case circuit breaker features a K frame and supports a maximum current of 400 Amps. It operates within a current range of 300 Amps and can handle insulation voltages of 1000V. With an impu
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4.8
140G-KC6F3-D40
Incorporating adjustable thermal and magnetic protection types, the 140G-KC6F3-D40 ensures reliable operation for diverse applications. Its rated insulation voltage is 1000 volts and it withstands imp
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5.0
140G-G2C4-C30
The 140G-G2C4-C30 model is a molded case circuit breaker intended for industrial applications, featuring a G frame design. It operates at 125 amps and has a four-pole configuration, making it ideal fo
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4.7
140G-G3C4-C45
The 140G-G3C4-C45 model is a molded case circuit breaker featuring a G-frame design. It operates with an amperage capacity of 125 Amps and has an interrupting rating of 35 kA. Designed for 4-pole conf
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4.8
140G-G3C4-C70
The 140G-G3C4-C70 circuit breaker is characterized by its 4-pole design and fixed thermal and magnetic protection types. It effectively manages a maximum current range of 70 Amps, with a thermal trip
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4.7
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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.