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 connector supports wire sizes ranging from 2.5 mm² to 95 mm². It can operate effectively within a temperature span of -25°C to 70°C and can be stored at temperatures between -40°C and 80°C. The d
This cable mechanism is compatible with 3-pole devices and can effectively support circuit breakers. Its NEMA Type 1/3/3R/12/4/4X enclosure rating allows it to maintain reliability in various applicat
This cable operator is constructed to function within NEMA ratings of 1, 3, 4, and 4X. It can operate efficiently at altitudes of up to 1000 meters and supports a temperature range between 0 °C to 40
Designed for Frame G applications, this multi-terminal lug kit supports copper conductors. It operates effectively within a temperature range from -50°C to +120°C and can handle storage temperatures f
This molded case circuit breaker is equipped with 3 poles and conforms to the G frame size specifications. It has a breaking capacity of 65 kA for both AC and DC circuits. The breaker utilizes a panel
The spreader terminal features three poles and can operate within a humidity level of up to 80% (non-condensing). It functions efficiently in a temperature range of 0 °C to 40 °C. Additionally, the 14
This circuit breaker has a durable H frame size and consists of three poles. It has a maximum breaking capacity of 65 kA and an insulation voltage rating of 1000 V. Rated for copper wire connections,
This flange handle supports fixed magnetic applications and is specifically used with Flex Cable Operators. It is designed for storage and operational conditions between 0 °C and 40 °C, and it withsta
This auxiliary switch supports a wire length of 1 meter and accommodates 20 AWG wire size. It has a maximum operational current of 0.1 A and a minimum of 0.01 A. It is designed to function within a te
This circuit breaker is rated for 600 volts AC with a thermal-magnetic protection type. It features three poles and an interrupt rating of 25 kA, making it suitable for various applications. The insul
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.