Generator Set · Power Generation
The Leroy-Somer LSA 49.3 is a low voltage alternator with 4 poles, rated 730 to 1000 kVA at 50 Hz and 915 to 1250 kVA at 60 Hz. For 50 Hz, 1500 rpm, continuous duty at 40 °C (class H, 125 K), power factor 0.8 and 400 V, the ratings are 730 kVA (584 kW) for M6, 820 kVA (656 kW) for M8, 910 kVA (728 kW) for L9 and 1000 kVA (800 kW) for L10. The 50 Hz stand-by duty at 40 °C (class H, 150 K) and 400 V reaches 1085 kVA (868 kW) on the L10. At 60 Hz, 1800 rpm and 480 V the continuous rating runs from 915 kVA (732 kW) on the M6 to 1250 kVA (1000 kW) on the L10.
Standard voltage ranges are 220 V - 240 V and 380 V - 415 V (440 V) at 50 Hz, and 208 V - 240 V and 380 V - 480 V at 60 Hz. The winding is class H with a 2/3 pitch and a 6-wire reconnectable layout, or an optional 12-wire one. Excitation is AREP / PMG with a D350 AVR, and steady-state voltage regulation is ± 0.25%. Motor starting capability at 400 V is 2050 kVA on M6 and M8 and 2600 kVA on L9 and L10. Protection is IP 23, with winding protection for clean environments up to 95 % humidity, including indoor marine environments.
Standard rotation is clockwise seen from the drive end, and anti-clockwise operation needs a 5% derating. Single-bearing weights are 1578 kg (M6), 1639 kg (M8), 1792 kg (L9) and 1841 kg (L10), and two-bearing machines weigh 1622, 1683, 1835 and 1884 kg. EC, UKCA, CMIM, CSA and UL declarations and certifications are said to be available. A separate German manual covers the water-cooled IC8 / CACW / TEWAC form with IP55 protection. It calls for a screw tightness check after about 20 operating hours and at least one cooler inspection per year, and the cooling water must run from start-up until the shaft stops and be shut off at standstill.
Sources: Leroy-Somer datasheet LSA 49.3, checked 05.10.2026
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What our service work and the manufacturer documentation say about keeping this model running.
Inspect engine fuel, lubrication and cooling systems, alternator, mounts, coupling, exhaust, governor, AVR and protection. Trend load balance, exhaust temperature, oil pressure, coolant temperature, frequency and voltage where available. Test synchronization and load acceptance under an approved electrical procedure. Refer to the manufacturer documentation for the exact figure for engine, generator and protection limits.
Carry engine filters, belts where fitted, seals, sensors, starter or control relays, AVR or excitation spares where justified, fuses and approved lubricants.
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