140G-R12I3-E30-Z1
Designed with an R frame, the 140G-R12I3-E30-Z1 can handle up to 3000 A while providing electronic LSIG protection. This circuit breaker has an insulation voltage rating of 1000 volts and an impulse w
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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-JTF3-D20
This molded case circuit breaker achieves a current range of 200 A, backed by an impressive rated insulation voltage of 1000 volts. It is rated to withstand impulse voltages of up to 8 kV. The breaker
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140G-H2C4-C40
This four-pole circuit breaker operates within a specified current range of 40 A, employing fixed thermal and fixed magnetic trip mechanisms for enhanced reliability. With a rated insulation voltage o
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140G-J3I3-D25
Designed for a current rating of 250 A, this circuit breaker has a rated insulation voltage of 1000 V. Its impulse withstand capability is rated at 8 kV. Weighing in at 5.51 pounds, this molded case c
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140G-H0F4-D16
This circuit breaker, categorized in frame H, features adjustable thermal and magnetic protection. It can manage currents up to 160 A and includes four poles for extended usability. Additional charact
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140G-I2C4-D12
This molded case circuit breaker operates on a frame size of I and supports a current range of 120 Amps. With a rated insulation voltage of 800 Volts and an impulse withstand voltage of 8 kV, this dev
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140G-J0C3-C60
Rated at 250 amps with a current range of 60 A, this molded case circuit breaker employs fixed thermal and magnetic protection methods. It supports a rated insulation voltage of 1000V and withstands i
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140G-J2C3-C60
This circuit breaker operates with fixed thermal and fixed magnetic protection technology. It supports a current rating of 60 Amps and up to 250 Amps of maximum current and is rated for up to 1000 vol
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140G-JTF3-D10
This circuit breaker utilizes a JC frame and operates within an adjustable current range of 100 Amps. It is rated for insulation voltage up to 1000 volts and can withstand impulse levels of 8 kV. Weig
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140G-JTF4-D12
This J-frame circuit breaker accommodates a maximum current range of 120 A and is equipped with an interrupting rating designated for the trip unit. Its rated insulation voltage is 1000 volts, allowin
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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.