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.
Browse available units in our catalog of 140G MCB.
This circuit breaker is classified under the J-frame and features adjustable thermal and magnetic protections. It operates within a current range of 250 A and is rated for an insulation voltage of 100
Featuring a contact configuration of 1 normally open (NO) and 1 normally closed (NC), this breaker includes one auxiliary contact. It has a wire length of 1 meter and withstands operating temperatures
The 140G-I3C4-D20 Molded Case Circuit Breaker has a Fixed Thermal/ Fixed Magnetic Protection Type and a 5.73 lb Weight.
This circuit breaker has a J frame design. It supports a rated current of 60 A and has a 35 kA interrupting capacity. Its rated insulation voltage is 1000 V, and it can withstand impulse voltages of u
This molded case circuit breaker supports a maximum current range of 250 Amps. It operates effectively at a rated insulation voltage of 1000 volts and has a rated impulse withstand voltage of 8 kV. Th
This circuit breaker operates with an interrupting capacity of 25 kA, a current rating of 220 A, and a maximum current rating of 250 A. It has a type J frame and ensures stability and compatibility wi
In the 140G line, the 140G-H0C3-C20 features a frame size of H, with a current range capable of handling up to 20 A. Its fixed thermal and magnetic protection mechanisms enhance reliability, while it
This circuit breaker operates within a current range of 50 Amps and features fixed thermal and magnetic protection mechanisms. Designed with a robust J frame, it withstands a rated insulation voltage
This circuit breaker is structured with a J frame and contains four poles. It operates with a current rating of 250 Amps. It is rated for up to 100V of insulation voltage, and it can also endure impul
The 140G-N5K3-E12 is a high-performance molded case circuit breaker suitable for industrial applications. This model accommodates a maximum current of 1200 amperes and is designed with an interrupting
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.