Mecc Alte S20W-95 Alternator — 6 KVA, single-phase, 3,000 RPM
The S20W-95 This is the entry-level model in the Mecc Alte S20W single-phase series, operating at 3,000 RPM, with a rated power of 6 KVA at 50 Hz. The S20W series covers a range from 6 to 8.5 kVA across three models and represents the next step up from the S16W series within the single-phase 3,000 RPM lineup. Brushless with internal capacitor regulation; no moving electrical parts require maintenance.
Technical characteristics
Rated power (50 Hz): 6 kVA / 6 kW (power factor 1)
Output voltage: 230 V single-phase
Frequency: 50 Hz
Speed: 3,000 RPM
Phases: 1
Excitation type: regulation via built-in capacitor (31.5 µF)
THD: less than 5%
Full-load efficiency (cos φ = 1): 77.5%
Technology: brushless, no brushes or commutators, maintenance-free
Direction of rotation: clockwise when viewed from the coupling side
Protection rating: IP21 (IP23 available upon request)
Insulation class: H
Impregnation: tropicalized epoxy resin, resistant to high-humidity environments
Housing: high-strength die-cast aluminum alloy
Shaft: C45 steel with open-style fan
Sound level: 64 dBA at 7 m / 80 dBA at 1 m
Maximum operating temperature: 40°C at altitudes below 1,000 m
Weight: 27.4 kg
Country of manufacture: Italy
Certifications: EN 60034-1, IEC 34-1, VDE 0530, BS 4999-5000, NF 51.111
Directives: 2006/42/EC, 2006/95/EC, 2004/108/EC
Electromagnetic compatibility: EN 61000-6-3, EN 61000-6-1
Complete S20W Series
S20W-95: 6 KVA, 27.4 kg (this product)
S20W-110: 7 KVA, 30.5 kg
S20W-130: 8.5 kVA, 34.9 kg
Available coupling options
The S20W series offers four mounting configurations. Select your option when adding to cart:
B9/c23 — C23-style bevel shaft coupling.
B9/c30 — C30-style bevel shaft coupling, with a larger shaft diameter than the C23. Suitable for motors with a C30 coupling flange.
J609b — J609b bevel shaft coupling.
Free-hub kit (B3B14) — Allows for pulley-and-belt mounting for motors without a bevel gear, compatible with previous models.
Dimension drawings for each coupling are available in the "Manuals" section of this page.
FAQ
Does the S20W-95 require an external capacitor?
No. The 31.5 µF excitation capacitor is built into the alternator and comes pre-installed from the factory.
What type of coupling do I need?
The B9/c23, B9/c30, and J609b types are direct-mount bevel shaft couplings with different shaft and flange dimensions. The free-shaft kit is for belt-and-pulley drive. If you have any questions, please contact us with the exact motor model before placing your order.
Are there any requirements regarding the direction of rotation?
Yes. To achieve the specified performance, the alternator must rotate clockwise as viewed from the coupling side. Check that your engine is rotating in the correct direction before starting it.
How often should maintenance be performed?
Since it is brushless, there are no brushes, commutators, or moving contacts to check. Maintenance is limited to cleaning the exterior and periodically checking the connections and bearings, following the intervals specified in the manual.
You can contact us by phone or email. We will be happy to advise you throughout the entire purchasing process.