Porcelain Drop-Out Fuse Cutouts
RW11 · 10–12 kV · 100/200A · IEC 60282-2
The most widely deployed cutout on Chinese 10kV distribution networks. Glazed ceramic insulator, silver-plated copper contacts, cement-bonded, proven over decades in utility service — from rural electrification to urban ring-main units.
✔ OEM / ODM · ✔ Stock models next-day · ✔ Type-test reports
Overview
The RW11-10 series porcelain drop-out fuse cutout is the standard protective device on Chinese 10kV overhead distribution lines — found on virtually every pole-mounted transformer and branch-line tap across the country. Its design is the result of decades of utility field experience, refined through millions of units in service.
The core structure: a glazed white or brown porcelain insulator body cement-bonded to hot-dip galvanized steel end-flanges, carrying a filament-wound epoxy fiberglass fuse tube with internal arc-extinguishing liner. The toggle mechanism uses a stainless-steel spring, holding the tube closed under ~2.5 kgf tension. Silver-plated copper contacts (≥2 µm plating) ensure consistent low-resistance current transfer.
Fault operation: the fuse link melts → arc forms inside the tube → arc-extinguishing liner decomposes into high-pressure gas → arc quenched at current zero → spring tension released → tube pivots and drops by gravity → visible isolation gap from ground level. This dual function (protection + visible disconnection) in a single passive device is why porcelain cutouts remain irreplaceable in distribution networks worldwide.
Best for: budget-sensitive projects · inland installations with moderate pollution · standard 10kV distribution transformer protection · projects requiring IEC 60282-2 type-test evidence. For coastal/polluted/heavy-export applications, see our Polymer HRW11 series →
Technical Specifications — RW11-10
All values per applicable IEC 60282-2 and GB 15166 type-test reports. Operating conditions: -30°C to +40°C, ≤1000m altitude, ≤35 m/s wind, seismic ≤8°.
| Rated Voltage | 10 kV (12 kV max operating) |
|---|---|
| Rated Current | 100 A / 200 A |
| Rated Breaking Capacity (sym.) | 6.3 kA (100A) / 8–12.5 kA (200A) |
| BIL to ground (1.2×50 µs) | 75–110 kV |
| BIL across contacts | 125 kV |
| Power Frequency Dry Withstand (1 min) | 42 kV rms |
| Power Frequency Wet Withstand (1 min) | 30 kV rms |
| Creepage Distance | 230–260 mm |
| Fuse Tube | Epoxy fiberglass filament-wound; arc-quenching liner |
| Contacts | Copper alloy, silver-plated ≥2 µm |
| Toggle Mechanism | Stainless steel spring, ~24.5 N tension |
| Hardware | Hot-dip galvanized steel ≥86 µm zinc |
| Dimensions (L×W×H) | ~480 × 320 × 270 mm |
| Weight (100A / 200A) | ~5.6 kg / ~7.5 kg |
| Standards | IEC 60282-2 / GB 15166 / ANSI C37.42 |
Range
RW11 series covers 10–24 kV in porcelain. Supplied individually or in 3-phase kits with matching fuse links.
| Model | Export Designation | Current | Breaking | Weight |
|---|---|---|---|---|
| RW11-10/100 | 12kV / 100A (Porcelain) | 100 A | 6.3 kA | ~5.6 kg |
| RW11-10/200 | 12kV / 200A (Porcelain) | 200 A | 8–12.5 kA | ~7.5 kg |
| RW11-24/100 | 24kV / 100A (Porcelain) | 100 A | 6.3 kA | ~9 kg |
| RW11-24/200 | 24kV / 200A (Porcelain) | 200 A | 8–12 kA | ~11 kg |
3-phase kits pre-assembled on mounting bracket available. Custom voltage/current on request.
Key Features
Proven Ceramic Insulator
Decades of field reliability. Glazed surface resists UV, tracking, and weathering. No polymer aging concerns.
Cement-Bonded Assembly
USA-sourced anchoring cement bonds porcelain to galvanized flanges — rapid-set, high strength, low thermal expansion.
Visible Drop-Out Indication
Fallen tube = instant fault identification from ground level. Critical in rural networks with limited SCADA monitoring.
Standard 3-Phase Kit
Supplied as 3-unit set on NEMA B bracket. Matching K/T-type fuse links 1–200 A in stock.
Hot-Stick Operable
Standard insulated operating rod opens/closes under load (with load-break attachment). 25° ± 2° downward mounting tilt for positive drop-out.
IEC 60282-2 Type Tested
Full type-test suite: breaking, impulse, dry/wet power-frequency, temperature rise, mechanical endurance. Reports for tender submission.
Applications
Distribution Transformers
Primary-side protection for 10kV pole-mounted transformers — single-phase and three-phase. The most common MV protective device in China.
Overhead Line Branches
Sectionalizing and overcurrent protection for 10kV distribution laterals and tap-off lines.
Capacitor Banks
Overcurrent and switching transient protection for pole-mounted capacitor installations in distribution networks.
Industrial MV Feeders
Protection of factory medium-voltage service entrances and equipment connections.
Frequently Asked Questions
What is the difference between RW11 and HRW11?
How is the fuse link installed and tensioned?
What causes porcelain insulator failure?
How often should cutouts be visually inspected?
Can porcelain cutouts operate under load?
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