R120 – R630 — analog automatic voltage regulators (AVR) for synchronous generators

Country: France · Model: R120–R630

The analog automatic voltage regulators R120–R630 control the excitation of synchronous generators with a current from 3.2 A in the R220 to 15 A in the R630. They work with SHUNT, AREP, AREP+ and PMG systems on TAL and LSA generators, and are used as spare parts and for upgrading generator sets, marine and industrial power plants.

Models: R120, R150, R180 (TAL series); R220, R250, R450, R610, R630 (LSA series)
Excitation current: 3.2 A (R220) – 15 A (R630); R120 — 4 A / 6 A 30 s
Excitation systems: SHUNT, AREP, AREP+, PMG, SHUNT + booster
Regulation accuracy: ±0.5 % (R120 — ±1 %, R150 — ±0.8 %)

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Technical specifications

Models	R120, R150, R180 (TAL series); R220, R250, R450, R610, R630 (LSA series)
Excitation current	3.2 A (R220) – 15 A (R630); R120 — 4 A / 6 A 30 s
Excitation systems	SHUNT, AREP, AREP+, PMG, SHUNT + booster
Regulation accuracy	±0.5 % (R120 — ±1 %, R150 — ±0.8 %)
Frequency range	10–100 Hz / 20–100 Hz
Functions	U/f limiting, overexcitation and short circuit current limiting; droop and parallel operation; load acceptance module LAM (R250, R450)
R610 / R630	three-phase sensing, cos φ / kVAr modes, voltage matching, stator current limiting
Discontinued	R438, R449 — replacement with SWITCH2D350 / SWITCH2D550 kits

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

Three models are intended for the TAL series. The R120 on SHUNT gives 4 A (6 A for 30 s) with ±1 % accuracy in the 20–100 Hz range, has U/f limiting with k = 1.2, protection against loss of sensing voltage and overexcitation limiting. The R150 delivers 6 A (8 A for 30 s) with ±0.8 % accuracy and adds droop, while the R180 for AREP+ and PMG gives 6 A (9 A for 5 s), ±0.5 % and supports a remote potentiometer. In the LSA series the smallest R220 with 3.2 A and 10–100 Hz comes in three-phase and single-phase versions, and for single-phase machines at 60 Hz there is the R221. The 5 A R250 is complemented by the load acceptance module LAM. The 6 A R450 works with SHUNT, PMG or AREP, limits overexcitation and short circuit current, has droop and LAM; the R450M variant is supplied with Mate-N-Lok connectors and the R450T with a three-phase sensing module. The R726 module adds cos φ regulation to it, and the R729 also adds kVAr with a 4–20 mA signal.

How to choose

The model is determined by the generator series, the excitation system and the current. The 10 A R610 for SHUNT, AREP, PMG or SHUNT with booster has three-phase sensing and droop, with cos φ and kVAr modes optional. The 15 A R630 adds manual and tracking modes, voltage matching before synchronisation, grid power factor regulation and stator current limiting, so it suits operation in parallel with the grid. In place of the discontinued R438 and R449 the manufacturer recommends the digital D350 and D550 with ±0.25 % accuracy.

Request a price and lead time

R120 – R630 — analog automatic voltage regulators (AVR) for synchronous generators. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

What can replace the discontinued R438 or R449 regulator?

For the R438 there is the SWITCH2D350 kit with the digital D350 regulator, and for the R449 the SWITCH2D550 kit with the D550.

What accuracy do the analog AVRs R120–R630 give?

Most models hold voltage with ±0.5 % accuracy, the R120 holds ±1 %, and the R150 holds ±0.8 %.

Which regulators are suitable for parallel operation of generators?

Droop for load sharing is available on the R150, R180, R450 and R610. The R630 has voltage matching before synchronisation and grid power factor regulation.

Is there a regulator for a single-phase 60 Hz generator?

Yes, the R221 is made for single-phase 60 Hz machines, and the basic R220 exists in three-phase and single-phase versions.