Replacing the Elgar SW5250
Programmable AC source.
What happened to it
Discontinued with no product page — only an end-of-life manual PDF remains, and what is left online is reseller stock.
The substitution that goes wrong
SW-series sources were often bought for standards work. A replacement that reaches the same voltage but cannot sequence a transient envelope will not run those clauses at all.
Specifications to match
- Output voltage, frequency range and phase configuration
- Transient and arbitrary-waveform programming if you test to a standard
- Remote interface compatibility with existing test executives
- Output impedance behavior under non-linear load
Before you swap the hardware
A replacement that matches on headline power can still fail on the details that keep an existing rack working.
- 01Match output voltage, frequency range and phase configuration.
- 02Confirm transient and waveform programming capability if you test to a standard.
- 03Verify remote interface compatibility with existing test executives.
Where Intepro fits
The closest current equivalent is the AN61(F) Series Programmable AC Test Power Supply, manufactured by Ainuo and supplied and integrated by Intepro. Every figure below is transcribed from its datasheet and re-checked against that document on each build.
| Power range | 500VA - 120kVA |
|---|---|
| Output voltage | AN615/AN618: Low grade: 0.0~175.0V, High grade: 0.0~350.0V (low gear/high gear/automatic gear). AN619: 0.00~350.00V |
| Output current | AN615/AN618: 5A to 60A effective per phase at 0-175V, peak 20A to 240A. AN619: 35A to 240A effective in three-phase mode, up to 720A single-phase; peak up to 2160A |
| Output frequency | AN615/AN618: 15~1000Hz. AN619: 30.000~100.000Hz. Resolution 0.001Hz |
| Part numbers | AN61500S-350(F) · AN61800S-350(F) · AN61501S-350(F) · AN61801S-350(F) · AN61502S-350(F) · AN61802S-350(F) · AN61504S-350(F) · AN61804S-350(F) · +23 more |
Manufactured by Ainuo and supplied by Intepro. Transcribed from the AN61(F) Series catalog pages P55-P62 that Intepro supplied on 2026-09-15, read from the rendered pages because that PDF carries no text layer, with the AN615/AN618 and AN619 user manuals alongside. Five sub-series share the page: AN615 and AN618 (single-phase, 500VA-6000VA), AN619 S (single-phase, 3000VA-20000VA), AN619 A (three-phase & single-phase, 6000VA-30000VA) and AN619 B cabinets (50kVA-120kVA). The manufacturer prints that specification changes will not be notified separately and that the parameters at the time of shipment prevail. This page does not assert that Intepro stocks every model; confirm availability before quoting.
Where this one stops
The AN61(F) spans 500VA to 120kVA, so bench and cabinet work both land on the same family rather than forcing a format decision up front. If the SW5250 was doing frequency-conversion duty rather than programmable-source duty, the AFC is the comparison instead. Match on the transient and inrush behavior your test actually exercises, not on the steady-state rating.
Further reading
Send us the spec you have to hit
Include the model you are replacing and what it was doing. We will come back with what matches and what does not.
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