CNKA  125a dc circuit breaker Introduction

CNKA  Low Price Wholesale 125A DC Circuit Breaker Made in China utilizes a voltage regulation method via transformer tap changer. Unlike traditional excitation tap changers, it cannot briefly open during load switching, as directly disconnecting the load current can cause arcing at the contacts, potentially burning out the tap changer or causing a short circuit. Therefore, the transformer must be powered off when adjusting gears. The 125A DC circuit breaker is typically used for transformers that do not have stringent voltage requirements and do not require frequent gear adjustments. 

CNKA  125a dc circuit breakerParameter (Specification)

CNKA  125a dc circuit breaker Classification

· 1 Neutral Busbar Circuit Breakers (NBS)

· 2 Neutral Busbar Grounding Circuit Breakers (NBGS)

· 3 Metal Transfer Circuit Breakers (MRTB)

· 4 Earth circuit transfer circuit breakers (ERTB)

CNKA  125a dc circuit breaker Details

CNKA  125a dc circuit breaker Dimensions and wiring

CNKA 125a dc circuit breaker Development difficulties 

The development of DC circuit breakers faces two main challenges. Firstly, unlike AC systems, there is no natural zero crossing of current in DC systems, so the arc extinguishing technology used in mature AC circuit breakers cannot be used. Secondly, the inductive components in the DC system can store a large amount of energy, which significantly increases the difficulty of breaking DC fault currents.