Miniature Circuit Breakers (mcb) Multi 9 Definition Protect cables against overloads and short circuits



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tarix05.02.2018
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Miniature Circuit Breakers (MCB) Multi 9


Definition

  • Protect cables against overloads and short circuits

  • Let the current flow without overheating on cables

  • Open and close a circuit under rated current

  • Protect against insulation faults (see earth leakage protection module)



Definition



Definition



Definition

  • The modular design meets 2 criteria:

  •  mounting on a 35 mm symmetrical rail

  • dimensions - modules in widths of 17.5 mm + 0.5 - 0 - external part = 45 mm - depth between 55 and 70 mm



The technology



Overload protection

  • A bimetal strip is used:  to protect the cable against overloads symbol:

  • principle of the bimetal: in a Multi 9 circuit breaker 



Overload protection



Overload protection

  • Temperature derating  our circuit breakers do not have temperature compensation  if the calibration temperature is different from the ambient temperature: derating is required



Short-circuit protection



Short-circuit protection



Short-circuit protection



The magnetic tripping levels with high inrush current: like LV/LV transformers

  • B curve

  •  3 and 5 In protection low short-circuit current generators



Marking

  • Side panel marking:



Choosing a circuit breaker



Auxiliaries: C60

  • SD: alarm switch

  • MX + OF: shunt trip  MN: undervoltage release



Auxiliaries: NC100 - NC125

  • SD: alarm switch  MX + OF: shunt trip  MN: undervoltage release



End presentation





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