The HPL Combined DCB is a single or three-pole operated disconnecting circuit breaker with a motor charged spring operating mechanism
Safety and interlocking
A disconnecting circuit breaker must be equipped with a safe and reliable system which prevents maloperation and indicates the disconnected position. The system shall prevent the circuit breaker to be unintentionally closed and the grounding switch to be closed to a live circuit.
For DCB this is carried out as motor operated blocking chain. Indicators such as signs, lamps and the position of the grounding switch, if applicable, show when the circuit breaker is locked in the open position.
Another safety feature is the use of composite insulators, which, beside their excellent electrical properties, also are tolerant towards mechanical stress and damage.
Grounding (Earthing) Switch
The DCB is equipped with an integrated motor operated grounding switch. The operation of the grounding switch is integrated in the unique and advanced interlocking system for the DCB. The grounding switch has a well proven design with superior mechanical endurance and low maintenance requirement.