140G-J3F3-C80
This breaker utilizes adjustable thermal and magnetic protection technology and can handle 80 A of rated current and 250 A of maximum current. It supports a maximum rated insulation voltage of 1000 vo
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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 available units in our catalog of 140G MCB.
140G-J6F3-C90
This breaker operates within a current range of 90 A and is designed with adjustable thermal and magnetic protection features. It can withstand a rated insulation voltage of 1000 V and impulse voltage
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5.0
140G-K3I4-D40
This circuit breaker model features four poles for effective circuit management. It has a type K frame and a current handling rating of 400 A. It operates at a rated insulation voltage of 1000 V and c
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4.5
140G-M0I3-D80
This 800 A circuit breaker is mounted in an M frame. It has a rated insulation voltage of 1000 V and withstands impulse voltages of up to 8 kV. It weighs 26.68 pounds and features a mechanical life ra
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4.9
140G-R12I4-E30
Operating within a current range of 2500 to 3000 Amps, this breaker utilizes electronic LSIG protection to maintain safety and reliability. It supports up to 1000 volts of insulation and can withstand
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4.9
140G-G-SND
This molded case circuit breaker operates with control voltages ranging from 110 V to 127 V, both AC and DC. It is rated for maximum operating altitudes of 1000 meters and can function effectively wit
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140G-H15C4-C25
This Allen-Bradley circuit breaker operates with a frame type labeled H and supports four poles. It caters to a current range of 25 Amps and is equipped with both fixed thermal and fixed magnetic prot
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5.0
140G-H15H4-D12
The Allen-Bradley 140G-H15H4-D12, part of the 140G MCB series, functions with four poles and offers electronic LSI protection. It is built to manage a current range of 120 A and has a rated insulation
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5.0
140G-H2F3-C90
This circuit breaker, rated for 90 Amps, ensures effective overcurrent protection with an interrupting capacity of 25 kA. It supports a rated insulation voltage of 1000 volts and an impulse withstand
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140G-H2H3-C25
This model features a frame size denoted as H and operates within a current range of 25 Amps. It supports a rated insulation voltage of 1000 volts and can tolerate impulse voltages of 8 kV. Weighing a
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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.