Circuit Breaker: Construction, Working, Types & Uses

MCB (Miniature Circuit Breaker), Construction, Working, Types & Uses

https://www.electricaltechnology.org/2016/02/mcb-miniature-circuit-breaker-types-construction-working-uses.html
MCBs are used primarily as an alternative to the fuse switch in most of the circuits.
A wide variety of MCBs have been in use nowadays in all areas of domestic, commercial and industrial applications as a reliable means of protection.

Air Circuit Breaker (ACB) – Construction, Operation, Types and Uses
https://www.electricaltechnology.org/2014/11/air-circuit-breaker-operation-types-uses.html
Circuit breakers are widely used in industries as well as power system for controlling and protection of different parts of the circuit like switch gears, Transformers, Motors, Generators/Alternator etc., which leads the system stable and reliable

14 Comments

  1. Ann Moody says:

    A circuit breaker, designed to protect an electrical circuit, is an automatically operated electrical switch.

    Portable Generators

    Reply
  2. Tomi Engdahl says:

    E-fuses: warming up to higher-current applications
    https://www.edn.com/e-fuses-warming-up-to-higher-current-applications/

    The brief note explained the ins and outs of e-fuses with respect to these regulations, and it also reminded me of a point that it’s easy to overlook: fuses protect against overcurrent situations and the risk they pose to systems and people. They are not for high-voltage protection, even though we may unconsciously associate “danger” with AC-line voltage of 120/240V and the large amounts of current AC lines can deliver. The TI note lists approved e-fuses that go up to 4.5 to 60V at 6 A – clearly not line voltage, but still a substantial amount of current and double-digit voltage. Protection against high-voltage events is not a task for a fuse; instead, that is the role of MOVs, spark gaps, and other components.

    Reply
  3. Tomi Engdahl says:

    https://www.electrical-installation.org/enwiki/Standards_and_description_of_circuit-breakers
    For industrial LV installations the relevant IEC standards are, or are due to be:

    60947-1: general rules
    60947-2: part 2: circuit-breakers
    60947-3: part 3: switches, disconnectors, switch-disconnectors and fuse combination units
    60947-4: part 4: contactors and motor starters
    60947-5: part 5: control-circuit devices and switching elements
    60947-6: part 6: multiple function switching devices
    60947-7: part 7: ancillary equipment
    60947-8: Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines.

    IEC 60947-2:2016+AMD1:2019 CSV
    Consolidated version
    Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
    https://webstore.iec.ch/publication/65448

    Reply
  4. Tomi Engdahl says:

    Failed elevator switch fuse / fusible disconnect
    https://www.youtube.com/watch?v=9WW0hBkxUnA

    This is a common industrial grade switch-fuse unit used for isolation and protection. The unit in this video had failed, so I thought it would be interesting to see what had gone wrong.

    Reply

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