The IS200HFPAG1ADB High-Frequency AC/Fan Power Supply Explained

Every GE Mark VI cabinet needs reliable cooling and clean low-voltage control power, and the IS200HFPAG1ADB is one of the boards GE assigned to that job. Part of the Speedtronic Mark VI IS200 family, this G1-group HFPA converts cabinet input power into the AC and DC outputs that run the fans and feed the control section. It is a workhorse rather than a headline card, but when it degrades the whole lineup feels it, so knowing its role pays off during troubleshooting.

What the board converts and drives

The IS200HFPAG1ADB receives an AC or DC input through four stab-on input connectors and delivers its outputs through eight output plug connectors. The documented output set covers 48 VAC, 52 VAC, 48 VDC, and 17.7 VAC, with combined output rated not to exceed 90 VA. The board is populated with two transformers, two heat sinks, three high-voltage capacitors, a metal-oxide varistor for transient protection, four fuses, and two LEDs that indicate output status. It is typically installed in the drive cabinet close to a board rack or fan enclosure, where it supplies cooling and control power.

A field checklist before you replace the board

An HFPA is one of the easiest boards to condemn by mistake, because a fan, a fuse, or an upstream feed can produce identical symptoms. Run this sequence before ordering:

• LED status. Check the two output indicators to see which rails are live. Partial output loss usually implicates a fuse or a single branch rather than the entire board.
• Fuses and shorts. Test all four fuses. If one keeps failing, hunt for the short in the fan or cable it protects before fitting another board.
• Fan hardware. Verify the cooling fans physically turn and that their connectors are sound. Over-temperature events are often mechanical, not electronic.
• Input feed. Confirm the incoming supply is present at the stab-on connectors so you do not chase a fault that lives upstream.

If input is healthy, the fuses are intact, the fans run, and an output is still absent, the IS200HFPAG1ADB is a credible cause and replacement is warranted.

How the IS200HFPAG1ADB part number is built

Matching the correct board comes down to reading the code carefully. IS200 is the Mark VI IS200 board series, HFPA is the high-frequency AC/fan power supply function, G1 is the functional group, and the A revision plus the DB suffix capture the hardware revision and coating variant. A different group or suffix can mean a different configuration, so confirm the full string against the board you are replacing. For a segment-by-segment explanation, use our GE Speedtronic Part Number Decoder. Note that the closely related G2-group HFPA shares the same basic function but carries its own revisions, so do not substitute across groups without checking.

Where this board fits among Mark VI spares

The HFPA supports the backplane and the VME cards that rely on cooling and control power. Browse companion parts in the GE Mark VI IS200 Boards collection and the wider GE Speedtronic Turbine Control Boards range. If your fleet spans generations, our Mark V vs Mark VI: DS200 to IS200 guide is a helpful reference for planning.

Details that speed up your quote

Please provide:

• The full part number and suffix from the label (IS200HFPAG1ADB) plus any extra revision codes
• A photo of the board label
• Turbine model and the cabinet or unit served
• Quantity, and whether this is a spare or an active repair

Ask for a quote

This IS200HFPAG1ADB is supplied used, cleaned and tested, with the warranty stated below. Click Request a Quote for a response within 24 hours. We ship worldwide DDP and accept purchase orders from qualified organizations. Tell us how quickly you need it and we will confirm availability and lead time.