Air Circuit Breakers

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      Frequently Asked Questions

      What is the rated temperature on the Emax Air circuit breakers (ACBs)?

      40°C is the base rating on all Emax Air circuit breakers (ACBs). Nevertheless, they can operate at higher temperatures in certain installation conditions, breaker types and frame sizes. For instance, the Emax E1, 800 A frame breaker can operate under full load up to 70°C. The Emax E3, 1600 A frame breaker can also operate under full load up to 70°C.

      Can an electrically operated breaker be mechanically closed following an elctric trip?

      Yes. As long as there is no electrical trip signal to the breaker, it can be mechanically charged and closed locally. This assumes that the reason for requiring to use this procedure is loss of control power. A circuit breaker that has opened under a fault condition should not be re-closed until the operator has ensured that the fault has been cleared.

      Is the trip unit of Emax Air circuit breaker (ACB) upgradable with additional features?

      Yes. The Emax breaker offers a wide range of field installable trip units with upgrades to include communications ability, power metering and power quality monitoring. Simply remove the existing trip unit and replace it with the new one.

      Can a breaker be changed from mechanically operated to electrically operated in the field?

      Yes. The Emax electrical accessories are inventoried for field installation and were designed with this alteration in mind. All internal accessories are pre-wired and terminated with plug-in connectors for quick and easy installation. Most accessories also operate on both AC and DC voltages.

      Are the Emax Air circuit breakers (ACBs) suitable for reverse feeding?

      Yes. All ABB power circuit breakers and molded case circuit breakers are suitable for reverse feeding.

      Are Emax Air circuit breakers (ACBs) rated at 100%?

      Yes. Emax power circuit breakers are listed in accordance with UL Standard 1066 and ANSI C37 for operation at their rated continuous current.

      Does the draw-out version of the Emax Air circuit breakers (ACBs) require maintenance/adjustment of the spring tension on the terminal jaws?

      No. The ABB Emax Air circuit breakers (ACBs) are constructed with heat treated steel leaf springs within the fixed cradle. These springs permanently maintain the required tension on the jaw connections.

      Can the shunt trip and closing coil accessories of Emax Air circuit breakers (ACBs) be continuously powered?

      Yes. The shunt trip and closing coils of the Emax circuit breakers can be continuously powered without damaging the device.

      Is mechanically interlocking different sizes of Emax Air circuit breakers (ACBs) possible?

      Yes. With the standard cable interlocking systems all frame sizes of the Emax circuit breakers can be mechanically interlocked. As well as interlocking all frames, the cable interlocks can also interlock fixed breakers with withdrawable breakers.

      Can the auxiliary contacts of the Emax Air circuit breakers (ACBs) be reconfigured?

      Yes. All auxiliary contacts provided with the Emax circuit breakers can be reconfigured for either normally open or normally closed operation.

      Can the Emax Air circuit breakers (ACBs) be racked in and out of the connected position with the door closed?

      Yes. While the front of the breaker is accessible with the door closed, the racking rails and components are behind the door when it is closed. This allows the operator to rack the breaker in and out with the door securely fastened.

      Is the Emax breaker Insulated Case or Moulded Case?

      Neither. The Emax breaker is an Air Power Circuit Breaker.

      Is there an extensive spare parts requirement for the Emax Air circuit breakers (ACBs)?

      No. The fixed parts for withdrawable circuit breakers are common to each model, regardless of the rated current and interrupting capacity. This commonality of parts minimizes the need for an extensive spare parts inventory.

      Can additional auxiliary contacts be added to interface with an existing control scheme?

      Yes. The Emax Air circuit breakers (ACBs) has many options for added contact configurations.

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