ZW43 12V Outdoor HV Vacuum Circuit Breaker 630-1250A 12.5-25kA Embedded Pole with Disconnector IEC Certified Pole Mounted VCB

The ZW43 12V Outdoor HV Vacuum Circuit Breaker 630-1250A 12.5-25kA Embedded Pole with Disconnector IEC Certified Pole Mounted VCB is a fully self-contained outdoor 12kV protection device integrating factory-installed current transformers, a direct-acting overcurrent release, and a high-speed vacuum interrupter in a single 90 kg pole-mounted assembly. Manufactured by JYDQ in Zhejiang, China, type-tested to IEC 62271-100 and GB 1984, this circuit breaker eliminates the external CTs, protection relays, and auxiliary power supplies required by conventional pole-top protection — delivering autonomous feeder fault detection and clearing from a single commissioning-ready unit. For rural or remote environments where auxiliary power is unavailable, the self-powered overcurrent release operates directly from CT secondary current, maintaining protection even during total auxiliary power failure. Available as ZW43-12.

Product General Information

Key Design Features

Self-Contained Protection Without External Relays

The ZW43-12 incorporates factory-installed CTs at three standard ratios — 200/5, 400/5, and 630/5 — with a 5A overcurrent release drawing operating energy directly from CT secondary current. No external relays, voltage transformers, or battery-backed auxiliary supplies are required. The protection system operates autonomously under black-start and total auxiliary power failure — a fail-safe capability not available from protection architectures that depend on external auxiliary power supply. The circuit breaker protects the feeder even if all communication and auxiliary power systems have failed. The operating mechanism accepts coils at DC 220V, DC 110V, or AC 220V, with a 70W energy storage motor completing spring charging in 8 seconds or less.

Ultra-Lightweight 90 kg — Two-Person Installation Without a Crane

At 90 kg complete with integrated CTs, overcurrent release, and operating mechanism, the ZW43-12 installs on standard distribution poles using basic handling equipment. A two-person crew completes installation and commissioning in under four hours — no crane, no winch, no reinforced pole structures. This weight is achieved by consolidating separate CT enclosures, relay cabinets, and control wiring into a single compact assembly. For rural electrification and rapid grid extension, the installation profile substantially reduces deployment cost versus conventional distributed protection. Every unit passes a 100-operation factory mechanism run-in, CT ratio and polarity testing, and kinematic verification under ISO 9001.

15 ms Minimum Opening Time and Verified Kinematic Performance

The ZW43-12 achieves an opening time as low as 15 milliseconds through its direct-acting overcurrent release, eliminating the processing delays of externally relayed protection. Factory-verified kinematics: opening speed 1.2 plus or minus 0.2 m/s, closing speed 0.6 plus or minus 0.2 m/s, closing bounce 2 ms maximum, three-phase synchronization 2 ms maximum. Main circuit DC resistance per phase is 80 micro-ohms or less. Contact spacing is 9 plus or minus 1 mm with 2 mm overtravel and 3 mm cumulative wear allowance. In practice, higher-rated vacuum circuit breakers are not inherently more reliable; reliability depends on how well design margins match actual operating conditions.

IEC 62271-100 Type-Tested and ISO 9001 Manufactured

Factory routine testing on every unit includes: power-frequency withstand at 42kV phase-to-ground and 48kV across fracture, lightning impulse withstand at 75kV phase-to-ground and 85kV across fracture, vacuum integrity, main circuit resistance, overcurrent release calibration, and CT ratio verification. Type-tested to IEC 62271-100 and GB 1984. For IEC-aligned distribution networks, confirm the applicable edition and market requirements with the supplier for grid authority submissions.

Applications

Autonomous Rural and Remote Feeder Protection

Built-in CTs and the self-powered 5A overcurrent release enable autonomous phase and earth fault detection without external relays or auxiliary power. In many developing-grid environments, daily voltage variation routinely exceeds stable-grid specification assumptions — the ZW43-12's energy-independent architecture remains fully operational regardless of grid fluctuation or auxiliary supply interruption. The O-0.3s-CO-180s-CO operating sequence supports auto-reclose duty on overhead lines. If your application requires guaranteed fault clearing under all auxiliary power failure modes, this self-powered architecture satisfies that requirement by design.

Grid Extension and Automated Feeder Backup Protection

For utilities and EPC contractors extending protection to new overhead lines, the 90 kg all-in-one unit installs in under four hours — eliminating CT mounting, relay installation, secondary wiring, and auxiliary commissioning. For automated feeders with feeder terminal units and SCADA, the ZW43-12 provides a self-powered backup layer that operates when communication or auxiliary power systems fail, ensuring fault-clearing capability independent of digital infrastructure.

Competitive Advantages and Ordering

• Self-contained pole-mounted VCB design with factory-installed CTs and overcurrent release as standard: Autonomous fault clearing without external devices, including under total auxiliary power failure conditions where externally powered protection cannot operate.
• Estimated 50% reduction in total installed protection cost by eliminating external CTs, relays, auxiliary power supplies, control cabinets, and secondary wiring.
• Dual-variant platform with single spares inventory: ZW43-12/630-16 (16kA/40kA) and ZW43-12/630-20 (20kA/50kA) share 100% non-interrupter component commonality.
• Commercial terms: FOB Ningbo or Shanghai, MOQ 1 Set, T/T or L/C at sight, export-standard wooden crate packaging, 15-25 working days delivery, supply capacity 500 sets per month.

FAQ

1. What are the main application and structural features of ZW43 vacuum circuit breaker?

ZW43 is an outdoor pole-mounted vacuum circuit breaker. It adopts fully sealed vacuum interrupter andintegrated solid sealing structure. It is compact in size, lightweight and widely used for overheaddistribution network for protection and control, such as power distribution lines, rural grid and industrial outdoor power systems

2. What rated voltage and breaking current options are available for ZW43?

The standard rated voltage is 12kV. Rated short-circuit breaking current can be 12.5kA, 16kA, 20kA, 25kA.We can customize the operating mechanism and technical parameters according to your grid protectionrequirements.

3. Can ZW43 vacuum circuit breaker adapt to harsh outdoor working conditions?

Yes. The shell is designed for outdoor use. It can work in rainy, dusty and high-temperature environment.For high altitude sites over 1000m, we will upgrade insulation. For coastal salt fog areas, anti-corrosionsurface treatment can be provided.

4. What certifications do you have for ZW43 vacuum circuit breaker?

All our ZW43 vacuum circuit breakers have CE certification. Relevant CE documents and technicaldatasheets can be provided for tender submission and customs clearance.

5. What is the warranty period for ZW43 vacuum circuit breaker?

We provide 10 years warranty for all ZW43 vacuum circuit breakers. Professional remote technical supportwill be available throughout the whole warranty period to handle equipment operation issues.