140G-K3H4-D40
This circuit breaker is built with four poles and supports a current range of 400 A. It has a rated insulation voltage of 1000 volts and can endure impulse withstand voltages up to 8 kV. The 140G-K3H4
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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-K3K4-D40
This circuit breaker operates with a K frame and has four poles. It manages a continuous current range of 400 A, with insulation voltage rated at up to 1000 Volts and an impulse withstand capability o
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140G-KTI4-D40
This circuit breaker operates with an interrupting rating controlled via a trip unit and supports a current range of 400 A. Its rated insulation voltage stands at 1000 volts, and it can withstand impu
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140G-M5I4-D63
This breaker features an M frame and offers four poles. It has a current range up to 630 A, operating with a rated insulation voltage of 1000 volts. The unit can withstand impulse voltages of up to 8
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140G-M5K3-D60
Designed within an M frame, the 140G-M5K3-D60 operates effectively with a current range of 600 A. The rated insulation voltage for this unit is 1000 volts, and it can withstand impulse voltages up to
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140G-M5X4
This 4-pole circuit breaker is designed specifically for frame-only current ranges and can withstand high insulation voltages of up to 1000 V. The rated impulse withstand voltage is 8 kV, making it ca
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140G-N0K4-E12-Z1
This particular breaker operates on a frame size N and is equipped with four poles. It has an electronic LSIG protection type and can handle a rated insulation voltage of 1000 volts. This model withst
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140G-N5H3-E12-Z1
This circuit breaker supports a current range of up to 1200 A and is designed with an N frame. It is rated for insulation voltage up to 1000 volts and can tolerate impulse surges of 8 kV. The unit wei
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140G-N5H4-E12-Z1
This unit contains four poles and operates within a current range up to 1200 A. It is built with a rated insulation voltage of 1000 V and holds an impulse withstand voltage rating of 8 kV, ensuring it
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140G-N5K3-E12-Z1
This is a molded case circuit breaker with an N frame type and can handle a rated insulation voltage of 1000 volts. It also features a rated impulse withstand voltage of 8 kV and weighs 21.39 pounds.
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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.