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 accessory is compatible with frame sizes G, H, I, and J, and is mounted inside to the right of the circuit breaker. It operates effectively in humidity levels of up to 80% and is rated for altitu
Featuring four poles, the 140G-G6C4-D11 operates efficiently across a current range of 110 A. Designed for safety, it includes fixed thermal and magnetic trip mechanisms. Its interrupting capacity is
This model features four poles and operates within a current range of up to 60 amps. The protection type is electronic LSI, providing enhanced operational safety. It can handle a rated insulation volt
This molded case circuit breaker supports a current range up to 100 Amps. It operates effectively within insulation voltage ratings of 1000 V. The unit has a substantial impulse withstand voltage of 8
This model offers an interrupting rating of 150 kA, ensuring effective fault protection. It provides both adjustable thermal and magnetic protection types. The breaker is classified for a current rang
This molded case circuit breaker features an H frame design. It supports a current rating of 100 A and utilizes electronic LSI protection technology. The unit is rated for insulation at 1000 volts and
This device is part of the J-frame series and operates efficiently within a current range of 120 A. It has a rated insulation voltage of 1000 volts and can handle impulse withstand voltages of 8 kV. W
This circuit breaker employs adjustable thermal and magnetic protection mechanisms. Its current range allows operation up to 150 A. Additionally, it supports a rated insulation voltage of 1000 V and w
Operating with a frame type of NS, the 140G-NS6H3-E12 breaker effectively supports a current range of up to 1200 A. It is rated for insulation voltages of 1000 volts and withstands impulse voltages of
This molded case circuit breaker features a G frame size and supports four poles. It operates with a current range of 32 Amps, and is equipped with fixed thermal and magnetic trip mechanisms. The rate
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.