Open box, defined

Open-box stock occupies a useful middle ground: hardware that was never fielded but is no longer factory-sealed. This DS200UPSAG1AGD power supply board is exactly that — new surplus without the original box, cleaned and tested before it ships, and covered by a one-year warranty as the table below records. For a board whose failure mode takes a whole cabinet down with it, that grade buys verified working hardware without hunting for sealed stock, and it suits both emergency replacement and the spares shelf.

Function in the excitation lineup

The UPSA is a power supply board of GE's DS200 catalog era, documented by parts vendors against the EX2000 excitation platform — the exciter equipment standing next to many Speedtronic Mark V-controlled generators — and, in GE's parallel use of the same design, as the UC2000 supply for Innovation Series drive controllers. GE-era descriptions republished in the surplus market call it a two-stage off-line switching supply, fed from an AC or DC line source and producing the control-level voltages for the rack it powers. Physically the board carries three protective fuses, a reset button, LED indication, three 9-pin connectors, and the bank of capacitors any switching supply needs — details that matter mostly because they are your diagnostic touchpoints.

Troubleshoot before you spend

The order of operations for dead or flaky control power has not changed in thirty years:

• Input first: verify the feed at the cabinet terminals, upstream protection included.
• Fuses second: open elements point downstream — find the load fault before energizing any replacement, and match fuse ratings to the factory specification, never approximately.
• Reset and LED third: cheap evidence, worth capturing for your records and for our stock match.
• Safety throughout: capacitors hold charge briefly after power-down; published guidance for this board is to wait roughly 30 seconds before handling it.

If your dead rack is actually a Speedtronic Mark V core — <R>, <S>, <T>, or <C> — stop: that panel's supplies are DS200TCPS boards, a different family we also stock. Sorting DS200 acronyms into the right cabinets is what GE Mark V DS200 Boards Explained is for.

Suffix compatibility in practice

GE's DS-series decode makes this label short work. DS200UPSAG1AGD = Salem, Virginia origin (DS), base-level board (200), UPSA function, group G1, catalog-defining functional revision A, then GD as the backward-compatible revision pair — functional G, artwork D. The catalog number to match is DS200UPSAG1A; field labels also read DS200UPSAG1ADB or DS200UPSAG1AFD, and where your tail differs from ours we confirm interchangeability explicitly in the quote rather than leaving it implied. For the general method — including why G-groups and H-groups must never be swapped on assumption — see the GE Speedtronic Part Number Decoder.

Quote details that matter

1. Your board's full number and a label photo.
2. The host equipment (exciter, drive controller) and the plant's control platform — Mark V Simplex/TMR sites, note which.
3. Symptoms observed, fuse condition, LED behavior.
4. Condition preference: this open-box unit, or other grades we hold of the same number.
5. Quantity, destination country, urgency.

How ordering works

Press Request a Quote and send the list above; our answer arrives within 24 hours. We ship worldwide under DDP terms — landed at your plant with duties handled — and we accept purchase orders. Adjacent DS200 spares are gathered in GE Mark V DS200 Boards and the broader GE Speedtronic Turbine Control Boards range.