140G-J0H4-D10
This molded case circuit breaker features a J frame design with a rated current of 100 A. It operates effectively at a rated insulation voltage of 1000V and withstands impulse ratings of 8 kV. This br
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4.3
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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-J2C3-C25
This circuit breaker model features a 25 kA interrupting rating, which helps manage short circuits safely. It can handle rated currents of 25 A, additional current ratings of 250 A, and insulation vol
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4.7
140G-J2C4-C40
This circuit breaker is engineered to handle a rated current of 40 Amps and 250 Amps of maximum current. It features four poles. Its protection mechanisms include fixed thermal and fixed magnetic mech
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4.9
140G-J2C4-C63
This circuit breaker features four poles and operates with fixed thermal and fixed magnetic protection technology. Its current rating is 63 Amps, and its maximum current is 250 Amps. It is rated for i
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4.5
140G-J2I4-C60
This circuit breaker has four poles and operates with 60 A of rated current and 250 A of maximum current. It is built for demanding applications and has a rated insulation voltage of 1000 V and the ab
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4.5
140G-J3C3-C63
This circuit breaker accommodates a rated current of 63 A and a maximum current of 250 A. It has an interrupting capacity of 35 kA. Its rated insulation voltage is 1000V, and it can endure impulse vol
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4.7
140G-J3C4-C25
This circuit breaker offers four poles and is designed with fixed thermal and magnetic protection technology. It supports a rated current of 25 Amps and has a rated insulation voltage of 1000V. The br
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5.0
140G-J3F4-D10
This breaker operates effectively in a current range of 100 A and has a rated insulation voltage of 1000 volts. It withstands impulse voltages of up to 8 kV. At a weight of 7.72 pounds, the device ens
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4.3
140G-J3F4-D15
This breaker is configured with four poles and supports an adjustable thermal and magnetic protection type. It operates within a current range of 150 A, ensuring flexibility for different application
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4.6
140G-J3F4-D20
This product features a J frame design and operates with four poles. It supports a current range of 200 Amps, ensuring robustness in varying loads. Additionally, it is rated for an insulation voltage
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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.