LSA 49.3 – LSA 54.2 (LV) large low-voltage synchronous generators, 730–5200 kVA

LSA 49.3 – LSA 54.2 (LV) large low-voltage synchronous generators, 730–5200 kVA

Country: France · Model: LSA 49.3 – LSA 54.2

Large low-voltage synchronous generators LSA 49.3, 50.2, 52.3, 53.2 and 54.2 rated 730–5200 kVA for diesel and gas power plants, data centres, oil and gas facilities and ships. Four-pole, 1500–1800 rpm, efficiency up to 97.7 %, IP23 protection. Power is given in kVA at 50 Hz and in kW at 60 Hz.

Frame sizes: LSA 49.3 (730–1000 kVA), 50.2 (1100–1640), 52.3 (1860–2750), 53.2 (2000–4300), 54.2 (3500–5200 kVA)
Voltage: 220–480 V (LSA 52.3 — 380–480 V; LSA 54.2 — 400–480 V)
Poles / speed: 4 poles, 1500–1800 rpm
Shaft height: 400 mm (49.3), 450 mm (50.2, 52.3), 500 mm (53.2, 54.2)

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Technical specifications

Frame sizes	LSA 49.3 (730–1000 kVA), 50.2 (1100–1640), 52.3 (1860–2750), 53.2 (2000–4300), 54.2 (3500–5200 kVA)
Voltage	220–480 V (LSA 52.3 — 380–480 V; LSA 54.2 — 400–480 V)
Poles / speed	4 poles, 1500–1800 rpm
Shaft height	400 mm (49.3), 450 mm (50.2, 52.3), 500 mm (53.2, 54.2)
Max. efficiency	96.9 % (49.3) – 97.7 % (53.2)
Excitation	AREP, PMG; AREP + PMI (52.3–54.2)
Regulators	D350 / D550
Regulation accuracy	±0.25 %
Short-circuit current	300 % of rated, 10 s
Insulation / protection	class H, IP23
Also	LS 641–941 (Americas) in LV versions from 367 V

Specifications are taken from the manufacturer’s technical documentation. Updated 11/09/2026.

Description

LSA 49.3 delivers 730–1000 kVA with a shaft height of 400 mm, efficiency up to 96.9 % and 220–480 V. LSA 50.2 rated 1100–1640 kVA has 450 mm and efficiency up to 97 %. LSA 52.3 rated 1860–2750 kVA, 450 mm, up to 97.5 % at 380–480 V. LSA 53.2 rated 2000–4300 kVA (class H temperature rise at 40 °C), 500 mm, up to 97.7 % at cos φ = 1. LSA 54.2 rated 3500–5200 kVA, 500 mm, up to 97.5 % at 400–480 V. Class H insulation, 2/3 winding pitch, 6 terminals (12 optional on LSA 49.3 and 50.2), operation up to 1000 m, overspeed 2250 rpm. Air flow ranges from 1 m³/s on LSA 49.3 to 2.5–2.8 m³/s on LSA 52.3. Excitation is AREP or PMG, and LSA 52.3–54.2 use AREP with a permanent magnet inductor PMI. Regulators D350 or D550 hold an accuracy of ±0.25 % and a short-circuit current of 300 % for 10 s, and the D550 adds grid parallel operation, three-phase sensing, a data log and remote communication. SAE flanges 0, 00, 1 and 1/2, discs 14–24, single- or two-bearing design.

How to choose

Choose the frame size by power, with shaft height rising from 400 to 500 mm. For data centres that need low reactances, the American market offers LS 641 (1450–2500 kW), LS 661 (700–2200 kW, 6 poles), LS 841 (1800–3000 kW) and LS 941 (2600–5000 kW) with PMG and D550, and their voltage starts at 367–400 V. Options cover other voltages, heating, winding protection at humidity above 95 % and air filters that derate power by 5 or 10 %.