molded case circuit breaker working principle

{"cid":"91201877","title":"Hot sale Molded Case Circuit Breakers CVS-160--kampa","imgUrl":"https:\/\/img.chinax.com\/nimg\/b7\/fb\/a23bbd725943d6a1d8de52b4d550-200x200-1.jpg","attrs":{"Price":"$21.00\/Pieces 1-49 Pieces","Brand Name":"Kampa","Model Number":"CVS-160A","Place of Origin":"CHINA","Product name":"Molded Case Circuit Breakers","Color":"Black","Pole":"3P\/4P","Brand":"Kampa","Dimensions(mm) W X H X D":"105 X 161 X 86","Rated current":"160A","Type":"Moulded Case","Poles Number":"3","Packaging Details":"standard package"}}

{"cid":"91188332","title":"Easy Pact CVS MCCB Circuit Breaker Schneider , Buildings 3 Pole MCCB Circuit Breaker","imgUrl":"https:\/\/img.chinax.com\/nimg\/0e\/9a\/01beb536039ff12fe9999a31bf23-200x200-1.jpg","attrs":{"Price":"consult best discount","Brand Name":"SCHNEIDER","Model Number":"CVS type","Minimum Order Quantity":"1 PCS","Delivery Time":"2-5 days","Certification":"CE","Place of Origin":"FRANCE","Payment Terms":"T\/T, , Western Union,Paypal,, MoneyGram,, L\/C","Supply Ability":"500","Packaging Details":"schneider original package","Installation":"Fixed","Rated Insulation":"690V","Rated Current":"Up to 630A","Color of body":"Dark Grey","Material":"Plastic Shell","Number of poles":"3p or 4p"}}