Built-in Isolator Type Primary-Secondary Fusion Pole-Mounted CB

The Built-in Isolator Type Primary-Secondary Fusion Pole-Mounted Circuit Breaker features a one-piece epoxy casting that integrates the disconnector and the main circuit of the circuit breaker. Compared with conventional external disconnectors, the fully sealed design of the isolating blade reduces exposed live points on the primary side, facilitates operation and maintenance, and eliminates the risk of phase-to-phase short circuits caused by exposed isolating blades.

Specifications

Power frequency withstand voltage (1min) (rms), phase-to-phase and phase-to-ground / open contact: 42 / 48kV

Auxiliary power voltage: DC/AC 24V

Rated short-circuit making current (peak): 50kA

Secondary circuit 1min power frequency withstand voltage: 2kV

Partial discharge of complete unit (at 14.4kV): ≤5pC

Mechanical life (circuit breaker / disconnector): ≥10,000 / 3,000 operations

Rated peak withstand current: 50kA

Rated voltage: 12kV

Rated current: 630A

Rated short-circuit breaking current (rms): 20kA

Rated short-circuit current breaking operations: ≥30 times

Rated short-time withstand current (4s): 20kA

Rated frequency: 50Hz

Isolating gap: ≥120mm

Lightning impulse withstand voltage (peak), phase-to-phase and phase-to-ground / open contact: 75 / 85kV

Individual auxiliary power consumption: 4W / 8W

Features

Three-position indication for isolating function: isolation observation window, isolating position indicator, and isolating live indicator, ensuring visible isolating gap while enhancing safety

Voltage sensor uses CVT principle with secondary electrical isolation; secondary open contact withstand voltage meets 2kV/1min

Pole body integrates phase voltage/current sensors, zero-sequence voltage/current sensors, load-side voltage sensor, and power take-off source; can be flexibly configured per user requirements, eliminating on-site wiring and facil

Avoids issues such as magnetic saturation of electromagnetic transformers and voltage resonance; measurement range is significantly wider and easier to guarantee

Use of sensors eliminates the problems of electromagnetic CT secondary open circuit and PT secondary short circuit; secondary output is low-voltage signal, offering higher safety and reliability

Isolating switch features built-in fully sealed and fully insulated design, excellent weather resistance, maintenance-free, and long service life

Isolating switch adopts direct-drive transmission structure with few mechanical transmission parts, ensuring reliable operation

Main circuit of isolating switch and circuit breaker uses annular one-piece casting molding with outer silicone rubber composite insulation, offering reliable performance and excellent weather resistance

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