KFM250 Molded Case Circuit Breaker

The KFM250 Molded Case Circuit Breaker is designed for use in DC systems with a rated working DC voltage of less than 1000V and a rated working current ranging from 10A to 1250A.

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Features of KFM250 Molded Case Circuit Breaker

  • Suitable for application in ungrounded DC systems, systems with one earthed pole, or systems with a grounded neutral point.
  • Capable of carrying a maximum load of 1250A when multiple breakers are operated in parallel.
  • Features an arcing quench system that combines VJC and lSTAC technologies for enhanced safety.
  • Designed to operate at full load even in environments with a temperature of 50℃.
  • Can be mounted either vertically or horizontally to accommodate different installation preferences.
  • Includes an isolation function for added electrical safety.
  • Complies with international standards, including lEC60947-2 and GB14048.2.

Applications of KFM250 Molded Case Circuit Breaker

  • Within medium and low-voltage power systems, their role is to safeguard circuits against overloads, short circuits, and various electrical faults.
  • In industrial control systems, they serve to protect motors, transformers, and other essential equipment.
  • Their application extends to residential, commercial, and industrial building electrical systems, where they play a critical role in ensuring safety.
  • They are also utilized to safeguard communication equipment and communication lines.
  • Additionally, they are integral to the electrical systems of emerging energy sources like solar and wind power.
  • Their primary objective is to ensure the secure operation of electrical equipment.



Specification of KFM250 Molded Case Circuit Breaker

Parameter Value
Shell frame grade current 250
Ripping device rated current 100、125、140、160、180、200、225、250
Number of poles 4
Rated insulation voltage 1000V
Rated operational voltage DC 1000V
Rated impulse withstand voltage 8000V
Rated ultimate short-circuit breaking capacity 40
Rated operational short-circuit breaking capacity 25
Mechanical life 10000
Electrical life 5000
Flashover distance ≯50
Dimension 142X165X103mm
Overload protection 250-630 A
Protection function 100-250 A

250-360 A

Action tolerance ±20%
Work environment -40℃~+70℃