Molded case circuit breaker is commonly used in electrical components, on the number “3300” “3200” mean what?

The first digit is the number of poles. The two poles are represented by 2, the three by 3, and the four by 4.

The secondary digit denotes the tripping mode. “2” only electromagnetic (instantaneous trip), only short circuit protection function. “3” thermal magnetic release (compound release), with overload and short circuit protection.

The last two numbers represent internal attachments. “00” has no attachment. “08” alarm contact. “10” shunt trip, coil voltage DC24V, AC220V, AC380V, etc. DC24 in fire control remote trip is more commonly used. “20” auxiliary contacts. “30” underpressure release. “40” shunt trip + auxiliary contact. “50” Shunt Trip + Undervoltage Trip. “60” two sets of auxiliary contacts. “70” auxiliary + underpressure release. “18” shunt trip + alarm contact. “28” auxiliary contact + alarm contact. “38” undervoltage trip + alarm contact. “48” shunt trip, auxiliary contact, alarm contact. “68” two sets of auxiliary contacts + alarm contacts. “78” auxiliary contact, undervoltage trip, alarm contact.

Quadrupole circuit breakers have N – through (type A) and N – split with other three poles (type B). It is usually marked in 4 digits, such as :4300B for quadrupole overload and short circuit protection N separable. Some manufacturers of some series of quadrupole first is not A number is the letter “A” indicates the quadrupole type A, “B” indicates the quadrupole type B. For example, Deli’s CDM3, CDM6 series, “B308” represents the four-pole B-type N separable contact with alarm.