Low-temperature liquefaction prevention device of knob insulator type circuit breaker

The invention relates to the technical field of circuit breaker protection devices, in particular to a porcelain column type circuit breaker low-temperature liquefaction prevention device which comprises a beam box, circuit breaker poles, a supporting column, a heating device and a temperature control device, the three circuit breaker poles are arranged on the beam box at intervals, and an arc extinguish chamber is arranged in each circuit breaker pole; a pipeline capable of communicating the three arc extinguish chambers is arranged in the cross beam box, a supporting column is arranged on the lower side of the cross beam box, a heating device is arranged on the cross beam box and comprises an inner heating piece and an outer heating piece, and at least one outer heating piece is arranged on the outer side of the cross beam box at intervals. The cross beam box is reasonable and compact in structure and convenient to use, the inner heating piece and the outer heating piece are arranged to heat the interior an