Setavolt SA / SA-3 — manual variable autotransformers (variacs) 3–100 A
Country: United Kingdom · Model: Setavolt SA / SA-3
The Setavolt SA manual variac is designed for 3–100 A in the single-phase version and the three-phase SA-3 for 3–60 A. Turning the knob sets the output voltage smoothly from zero to 117 % of the input, so the unit finds a place on a laboratory table, in a repair shop and in a control panel.
- Current
- SA (1 phase) 3–100 A, SA-3 (3 phases) 3–60 A
- Output voltage
- 0–117 % of the input, smooth
- Input voltage
- SA: 220–240 / 110–127 V; SA-3: 380–415 / 190–208 / 440–480 V
- Construction
- toroidal core, copper winding, carbon brush
Technical specifications
| Current | SA (1 phase) 3–100 A, SA-3 (3 phases) 3–60 A |
|---|---|
| Output voltage | 0–117 % of the input, smooth |
| Input voltage | SA: 220–240 / 110–127 V; SA-3: 380–415 / 190–208 / 440–480 V |
| Construction | toroidal core, copper winding, carbon brush |
| Version | IP20 / NEMA 1, cover removable for panel mounting |
Replacement for
LATR-1M, LATR-2M, RNO-250-2, RNO-250-5, RNO-250-10, RNT (voltage regulators)
selected by purpose and main parameters, please confirm with the manager
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The construction is classic for a variac. A copper winding is wound on a toroidal core, and a carbon brush slides along the turns and takes off the required part of the voltage. Single-phase SA units are made for 220–240 V and 110–127 V grids. Three-phase SA-3 units come in versions for 380–415, 190–208 and 440–480 V. The enclosure complies with IP20 / NEMA 1, and with the cover removed the autotransformer can be built into a cabinet panel. The brush is a consumable part, and with intensive use its condition is checked during a scheduled inspection.
How to choose
The main points here are the load current and the number of phases. The single-phase SA covers 3–100 A, while the SA-3 is limited to 60 A. If regulation must be remote, take the motorised mSA or mSA-3 (up to 200 A), and for currents of 150–800 A without brushes the induction iSA is suitable.
Request a price and lead time
Setavolt SA / SA-3 — manual variable autotransformers (variacs) 3–100 A. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
How does Setavolt SA differ from SA-3?
The SA is single-phase for 3–100 A and the SA-3 is three-phase for 3–60 A. In both the output is adjusted manually from 0 to 117 % of the input voltage.
Can the SA variac raise the voltage above the mains?
Yes, the upper limit is 117 % of the input, so when the grid sags the nominal voltage can be restored at the output.
Can the SA be installed in an electrical cabinet?
Yes, the cover is removable and the autotransformer is mounted on a panel. In its own enclosure it has IP20 / NEMA 1 protection.
What input voltages does the three-phase SA-3 support?
Versions for 380–415, 190–208 and 440–480 V are made, so the unit suits both European and American grids.
What wears out in the manual SA autotransformer?
The carbon brush that slides along the copper winding on the toroidal core. It is inspected and replaced if necessary, and the rest of the construction has almost no wear.
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Need a price, lead time or replacement?
Send us a request and we will confirm the configuration, lead time and delivery terms. We reply by email.