LOW VOLTAGE APPARATUS ›› 2022, Vol. 0 ›› Issue (8): 61-66.doi: 10.16628/j.cnki.2095-8188.2022.08.011

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Selection and Design of Bimetallic Sheet of MCCB

XIAO Lin, JIANG Guping   

  1. Shanghai Liangxin Electrical Co.,Ltd.,Shanghai 200137,China
  • Received:2022-01-25 Online:2022-08-30 Published:2022-10-11

Abstract:

Thermal magnetic moulded case circuit breaker(MCCB) generally uses bimetallic sheet for overload tripping protection.The displacement of bimetallic sheet moves the operating mechanism through deformation to realize overload tripping protection.In the design,the thermal bending displacement of bimetallic sheet is the most important characteristic design.In addition,it is necessary to check whether the bending force can overcome the tripping force,and the heating of bimetallic sheet is required to reach a certain range.Finally,the design and selection method of bimetallic sheet are discussed through several examples.

Key words: moulded case circuit breaker(MCCB), bimetallic sheet, overload trip, thrust

CLC Number: