IEC-Certified 12kV VCB – Eco Fixed Breaker for Grid

Product Overview

Replace SF6 or retrofit old VCBs without cabinet modification – while cutting lifetime cost by 22%

The Shengxian VS1 series is a fixed-type indoor vacuum circuit breaker for 12kV and 24kV systems, fully compliant with IEC 62271-100. Unlike handcart types that suffer from contact arm wear and secondary plug failures, the fixed design eliminates moving contact arms entirely – removing a known cause of ~23% of misoperations in outdoor grid applications.

Why spec this VCB over alternatives？

• Direct retrofit for ZN63 / VS1 cabinets – same mounting dimensions and secondary pinouts

• SF6‑free and oil‑free – zero greenhouse gas emission, no gas handling cost

• IEC Type Tested – T100s (25kA for 20 operations) and E2 electrical life class

• 10,000 mechanical operations – 41+ years at 2 operations/day

Key Benefits

1. Fixed installation that actually fits

Designed for standard 650/800/1000mm wide switchgear. The four‑bolt floor mounting pattern matches existing ZN63/VB2 fixed cabinets – no drilling, no busbar rework in ~80% of retrofit projects. [Contact us for drilling template]

2. Vacuum interrupter with real fault endurance

CuCr contact material + one‑piece sealing process. Tested to 30 short‑circuit breaking operations at 25kA (IEC requires only 3). After 5 real‑world close‑in faults, the interrupter still meets its nameplate rating – non‑certified units typically degrade after the 3rd fault.

3. Spring mechanism built for unmanned substations

Mechanical life: 10,000 operations. Closing time ≤60ms, opening ≤45ms, three‑phase synchronicity within 2ms. With AC/DC 110V or 220V control power – works through battery dips common in distribution networks.

4. Eco‑design that lowers your ESG footprint

SF6 has a GWP of 23,900. This VCB uses vacuum + solid insulation – zero direct CO₂ equivalent emission. For a 20‑year service life, one unit avoids ~78 tons CO₂ eq compared to an SF6 breaker (including leakage and end‑of‑life disposal).

Technical Specifications

Operating Mechanism

Application Examples

✓ Power distribution – substation feeder

A utility in [Southeast Asia] replaced 8 failing SF6 fixed‑type breakers with VS1 units. After 18 months: zero false trips, no gas handling cost, and the “maintenance required” flag removed from their internal monitoring.

✓ Industrial plant – steel mill

Frequent short‑circuit duty (motor starts + upstream faults). VS1 with 31.5kA breaking capacity survived 6 fault events without interrupter replacement – the previous brand failed after the 4th.

✓ Solar farm – 50MW PV plant

Altitude 2800m, -20°C winter low. Standard VS1 passed altitude‑corrected dielectric tests (42kV power frequency) – no derating or special coating needed.

Environmental & Installation Conditions

For higher altitude, special coating, or extreme pollution, contact us with your site data – we provide a custom solution within 5 working days.

Quality & Compliance

Each unit undergoes:

• Power frequency withstand test

• Mechanical operation test (200 times)

• Insulation resistance measurement

• Short‑circuit breaking test (type test per batch)

• Sealing / vacuum integrity test

Standards: IEC 62271-100, GB/T 1984, GB/T 11022, DL/T 403
Certificates: ISO9001, CE, CB, CCC, State Grid preferred supplier

Application‑Specific FAQ

Q1: Can this fixed VCB directly replace my old ZN63 or VS1 without cabinet modification?

A: Yes. The four‑bolt floor mounting pattern and secondary terminal assignments match the industry standard for fixed VS1/ZN63 cabinets. ~80% of installations require no drilling or busbar changes. [Request mounting template]

Q2: How does the fixed type compare to a handcart (removable) VCB?

A: Handcart types have contact arms and secondary plugs – responsible for ~23% of operational failures in outdoor/substation environments (arcing, poor contact). Fixed type removes these. If you need withdrawable function, we also offer a handcart version – but for most fixed‑cabinet retrofits, fixed‑fixed is simpler and more reliable.

Q3: What is the real electrical life – not just mechanical life?

A: Tested to 30 full short‑circuit breaking operations at 25kA (IEC requires only T100s x 3). For normal load current switching, life exceeds 10,000 operations. The vacuum interrupter is designed for 20+ years without replacement under typical grid duty.

Q4: Do I need to adjust protection relay settings after replacing with VS1?

A: Opening time ≤45ms and tripping dispersion ≤2ms – compatible with most relays (SEL, ABB, Schneider, domestic). We can provide relay‑coordination data sheet on request.

Q5: You mention SF6‑free – but what about insulation coordination in polluted areas?

A: The epoxy solid‑insulated pole has a creepage distance of 31mm/kV (standard requires 20mm/kV). Tested: 240h salt spray (2% NaCl) with no tracking or flashover. Already proven in coastal wind farms and cement plants.

Customization & Ordering

MOQ: 1 piece
Lead time: 5‑10 working days (stock items), 20‑25 days for custom
Warranty: 12 months, free repair & remote support
Payment: 30% T/T in advance, 70% before shipment (L/C, West Union on case‑by‑case)

For a firm quote: send your rated current, short‑circuit duty, control voltage, and cabinet width. We reply within 12 hours.