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- Description
- Download material
- Code map
- Contribute
- Competitive Models
- Manufacturer
- Send enquiry
- Vessels
- Spares
- Vendors
- Did you know
Description
Legacy analog (service).
Did you know
- Leroy-Somer, founded in 1919 in Angouleme, France, has a long history in the production of rotating machinery, including alternators and motors. Nidec acquired Leroy-Somer in 2017.
- The R421 is an automatic voltage regulator (AVR) within Leroy-Somer's electronic products range, which also includes analog and digital voltage regulators. Other AVRs in their lineup include the R230, R450, R450M, R221, R449, and R610.
- Leroy-Somer AVRs are known for their high performance, reliability, and long service life, ensuring the stability and quality of voltage output to protect the generator and connected equipment.
| Model | Excitation System Compatibility | Voltage Regulation | Short Circuit Current Capacity |
|---|---|---|---|
| R421 | AREP or PMG | ±0.5% (steady state) | 3 x In for 10s (with AREP/PMG) |
| R221 | SHUNT | Not specified, but recommended for applications where voltage difference between no-load and load is outside ISO8528-3 class G2 | Not specified |
| R449 | SHUNT, AREP, or PMG | ±0.5% (steady state) | 3 x In for 10s (with AREP/PMG) |
| R450 | AREP or PMG | ±0.5% (steady state) | 3 x In for 10s (with AREP/PMG) |
Competitive Models
^ZVCX DSEA106
Original DSEA106 (pre-MKII, legacy service).
^ZVEF SE500
Higher-capacity analog AVR.
^ZVCU DSE0700 MKII
Pocket-size genset control.
^ZVAF SX421
Earlier shunt-excited variant, still serviced on older sets.
^ZVCB DSEA109 MKII
Higher-power standalone AVR with external voltage trim input.
Send enquiry
Send an enquiry to the manufacturer of ^ZVBK R421. One broadcast per day.
Contribute or correct
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Code map
^Z V B K │ │ │ └── Model: R421 │ │ └───── Make: Leroy-Somer (Nidec) │ └──────── Equipment: Automatic Voltage Regulator └─────────── System: Automation Spares