140G-MTK4-D80
Engineered with a frame classified as M, this unit features four poles and operates effectively within an insulating voltage limit of 1000 volts. With an impressive interrupting rating based on its tr
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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-N5H4-E12
This four-pole circuit breaker operates within a current rating of 1200 A and supports a rated insulation voltage of 1000 volts. Featuring an electronic LSI protection type, it is designed to meet rig
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140G-N5K4-E12
This 4-pole circuit breaker supports a current capacity of 1200 A, indicating excellent adaptability for diverse configurations. It is rated for an insulation voltage of 1000 V and can withstand impul
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140G-N6H4-E12-Z1
This circuit breaker includes four poles and operates effectively within a current range of 1200 A. It withstands rated insulation voltages of 1000 volts and impulse voltages of up to 8 kV. Weighing 2
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140G-NS0K4-E12
This molded case circuit breaker operates at a frame classification of NS. The device features four poles and delivers a rated insulation voltage of 1000 volts. It also withstands impulse voltages up
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140G-NS6H4-E12
This circuit breaker features four poles and operates within a current range of 1200 A. It is designed to handle a rated insulation voltage of 1000 volts and offers an impulse withstand rating of up t
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140G-H3I3-D10
This model operates with a current range of up to 100 Amps and has an interrupting rating of 35 kA. It supports a rated insulation voltage of 1000 volts and can withstand impulse voltages of up to 8 k
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5.0
140G-J0F4-D10
This circuit breaker is engineered with a J frame and incorporates four poles. It offers adjustable thermal and magnetic protection, suited for various applications. Its current range is rated at 100
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140G-J2C4-C30
This circuit breaker operates with four poles and supports a rated current of 30 A and a maximum current of 250 A. It boasts an interrupting capacity of 25 kA and can withstand rated insulation voltag
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140G-JC0C3-C60
This device features a JC frame size with a current range of 60 A. The rated insulation voltage is 1000 volts, and the impulse withstand voltage measures 8 kV. The 140G-JC0C3-C60 weighs 5.51 pounds an
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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.