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Primary and Secondary Fusion Pole-Mounted Circuit Breaker

Product Description

The ZW20 pole-mounted circuit breaker is an outdoor distribution switchgear assembly with a rated voltage of 12kV and three-phase AC 50Hz. It can be equipped with automation control interfaces as per customer requirements, or purchased as a complete set with an FTU intelligent controller for automatic detection, isolation, and alarm of line faults, monitoring line operation, and automatic restoration of power supply to non-fault sections. It is also equipped with measurement, protection, control, and communication modules to meet distribution automation requirements. The circuit breaker offers both manual and electric operation modes, primarily used for breaking and making load currents, overcurrents, and short-circuit currents in power systems. Widely used in substations and industrial/mining power distribution systems, it is especially suitable for rural power grids and locations with frequent operations.

Product Advantages

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Flexible Installation Methods

Flexible installation methods: pole-mounted hoisting or base-mounted installation.

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Reliable Sealing Performance

SF6 pressure at zero gauge pressure, with mature sealing structure technology, ensuring reliable sealing and minimal leakage.

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Safe Operation

An explosion-proof device is installed on top of the enclosure, preventing the release of high-temperature gas or debris even in the event of internal faults.

Primary and Secondary Fusion Pole-Mounted Circuit Breaker

ZW20-12 | HXD833-F30

Outdoor High-Voltage AC Vacuum Circuit Breaker (ZW20 Spring-Operated/Permanent Magnetic Type)

Parameter Item	Parameter Value
Model	ZW20
Operation Method	Manual/Motorized
Rated Voltage	12 kV
Rated Frequency	50 Hz
Rated Current	630 A
Rated Short-Circuit Breaking Current	20, 25 kA
Rated Peak Withstand Current (Peak)	50, 63 kA
Rated Short-Time Withstand Current (4s)	20, 25 kA
Rated Short-Circuit Making Current (Peak)	50, 63 kA
Rated Current Breaking Cycles	10000 cycles
Rated Short-Circuit Breaking Cycles	30 cycles
1-Minute Power-Frequency Withstand Voltage (Phase-to-Phase, Phase-to-Ground)	42 kV
1-Minute Power-Frequency Withstand Voltage (Across Open Contact)	48 kV
1-Minute Power-Frequency Withstand Voltage (Secondary Circuit)	2 kV
Lightning Impulse Withstand Voltage (Peak, Phase-to-Phase, Phase-to-Ground)	75 kV
Lightning Impulse Withstand Voltage (Peak, Across Open Contact)	85 kV
Mechanical Life	10000 cycles

Box-Type FTU Feeder Terminal

Parameter Name	Parameter	Remarks
Power Source	DC24V
Communication Power Supply	DC24V/DC48V
Communication Channels	At least 3 communication channels.
Telemetry	Collects 2 line voltages, three-phase protection/measurement current, zero-sequence current, zero-sequence voltage
Output Circuits	2 remote control open/close circuits
Communication Interfaces	1 Bluetooth interface; 1 hot-swappable 4G/5G module interface; 2 RS232 communication interfaces; 2 Ethernet communication interfaces; 1 serial maintenance port;
Metering Function	Built-in line loss metering
Protection Functions	Three-stage overcurrent protection, two-stage zero-sequence current protection, short-circuit fault alarm, small current grounding line selection, three-shot auto-reclosing, non-interrupting current blocking, undervoltage alarm, zero-sequence overvoltage alarm, PT disconnection alarm, post-acceleration protection
Time Synchronization	GPS/Beidou time synchronization
Connection Type	Circular aviation connector (6-pin PT, 6-pin anti-open circuit current, 14-pin digital input/output)	Connected to the 26-pin aviation connector of the pole-mounted switch
Backup Power Supply	Rated voltage DC24V, single battery capacity ≥7Ah, service life ≥3 years, capable of completing "open-close-open" operation and maintaining operation of the distribution terminal and communication module for at least 4 hours.	Optional 12Ah or other capacity based on user requirements
IP Rating	IP65

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