Moulded Case Circuit Breakers

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      Frequently Asked Questions

      Are the Moulded Case Circuit Breakers (MCCBs) suitable for reverse feeding?

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

      Can an electrically operated breaker be mechanically closed following an electrical 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.

      Do Moulded Case Circuit Breakers (MCCBs) have short time withstand rating?

      MCCBs are downstream protective devices, and hence are expected to sense & clear circuit faults instantaneously without any delay. Due to this reason, MCCBs do not need to have any short time withstand rating. However, ABB’s MCCBs of ratings are available with suitable short time withstand rating.

      Are Moulded Case Circuit Breakers (MCCBs) suitable for DC applications?

      Yes, Moulded Case Circuit Breakers (MCCBs) with thermal-magnetic releases are suitable for DC application. The thermal rating in these MCCBs remain unchanged. However, MCCBs with static or microprocessor-based release are not suitable for DC applications and can only be used in AC networks.

      What types of protection is offered by Moulded Case Circuit Breakers (MCCBs) in an installation?

      Standard Moulded Case Circuit Breakers (MCCB) offer overload and short circuit protection to an installation. However, accessories are available to enable an MCCB to offer earth fault, earth leakage and undervoltage protection as well. Moulded Case Circuit Breakers (MCCB) can be tailored with additional features such as remote operation and undervoltage or shunt tripping unit along with adjustable time and current settings.

      How to select a suitable Moulded Case Circuit Breaker (MCCB)?

      Selection criteria:

      • Identify the rated voltage (V) & rated current (A)
      • Identify number of poles
      • Choose the type of frame
      • Identify the breaking capacity (kA)
      • Select the type of trip unit
      • Discrimination based on installation specifics

      Is interchangeability of trip units possible?

      With the XT2, XT4, XT5, XT6, XT7and XT7 M versions it is possible to interchange trip units keeping the same breaking part, so that installation can be upgraded with fewer costs. Upgradability of Ekip Touch and Hi-Touch trip units can always be performed with new functions via ABB Ability Marketplace™. A complete range of electronic trip units is suitable for different levels of protection, even enhancing selectivity values with early fault detection and prevention algorithm.

      What is the significance of the ABB Ability™ cloud platform?

      Easier monitoring of resources is attainable due to the SACE Tmax XT family’s built-in connectivity that links smartphones, tablets and PCs to data analysis tools on the ABB Ability™ cloud platform in real time. Several communication protocols enable remote communication.

      What are the possible trip units available in the Tmax XT range of Moulded Case Circuit Breakers (MCCBs)?

      Tmax XT Moulded Case Circuit Breakers (MCCBs) have a wide range of trip units catering to specified applications, namely power distribution, motor protection and generator protection. All of these applications provide options of magnetic and static trip units to choose from.

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