IS200RAPAG1BAA: The Board Every Other Board in the Rack Depends On

Processors get the glory; power supplies get the blame. The IS200RAPAG1BAA is GE's Rack Power Supply Board (functional acronym RAPA) from the Mark VI-era Speedtronic hardware generation. It mounts in GE's Innovation Series board rack and produces the regulated DC control voltages that every other board in that rack draws through the P1 backplane connector. Its input is not ordinary station DC: the RAPA is fed a 48 V, 25 kHz square-wave from an external supply and converts it into the rack's low-voltage rails. When this board is unhappy, the whole rack is unhappy — which is exactly why it gets ordered in a hurry, and sometimes ordered when it was never the problem.

One clarification worth making early: the Innovation Series board rack is not the same assembly as the Mark VI VME I/O racks that make up the <R>, <S>, and <T> control cores. If your dead rack is one of those VME racks, verify part numbers from the label before assuming a RAPA — the two rack families use different supplies. A label photo with your RFQ removes all doubt.

IPOK and MPOK: Read the Two LEDs Before You Buy Anything

The RAPA's faceplate carries two LEDs — IPOK (input power OK) and MPOK (module power OK) — and together they tell you which side of the board your problem lives on:

• Both dark: the board is not receiving its 48 V square-wave input. That points upstream — the external supply that generates the waveform, its wiring, or upstream protection. Replacing the RAPA fixes nothing here.
• IPOK lit, MPOK dark: input is arriving but the regulated outputs are not healthy. That is either a genuine RAPA failure or a downstream board or backplane short dragging a rail down. Unpower, pull the non-essential boards from the rack, and re-check — a shorted neighbor imitates a dead supply convincingly.
• Both lit, rack still misbehaving: stop shopping for a power supply and look at the individual boards, the backplane connections, or reset signaling.

Two more checks cost nothing: the board carries a 1 A, 250 V fuse, and the faceplate exposes four test points — documented as P5, P15, N15, and DCOM — so you can put a meter on the actual rails instead of guessing. Vendor documentation also describes a power-on/reset function on this board; a supply that holds the rack in reset can masquerade as a dead controller, so note any reset behavior you observe and mention it in your RFQ.

Part Number Anatomy: RAPA, G1B, and the BAA Revision

IS200RAPAG1BAA decodes as IS200 (GE standard-assembly control board of the Mark VI hardware era) + RAPA (Rack Power Supply Board) + G1B (configuration group) + BAA (revision block). The family ships in G1A and G1B groups — match yours exactly, because no source we trust documents them as interchangeable. Within G1B, revisions run BAA, BBA, BCA; this unit is the BAA. Whether your site accepts a different revision in the slot is a records question, not a guess. The general IS200 decoding pattern is covered in our GE Speedtronic Part Number Decoder.

Hardware on the Board and Faceplate

Physically, this is a modular board with a wide faceplate spanning two slots, secured with screw connectors and fitted with mounting clips — the two LEDs, a reset button, and the test-point opening live on that faceplate. The board itself carries heat sinks, an inductor, capacitors, and the fuse, and it stores its own identity: a 1024-bit serial memory device holds the board ID and revision, readable through the P1 connector on the BRDID line. That means the rack can know exactly which board and revision is installed — and so can you, from the label, without pulling the board.

Details That Get You an Exact-Match Quote

• Full part number with revision: IS200RAPAG1BAA (G1B group — confirm it is not a G1A slot)
• Photo of the board label and, if accessible, the rack nameplate
• What the rack controls at your plant, and the turbine or system generation from your records
• The LED pattern you observed (IPOK/MPOK) — it helps us sanity-check that the RAPA is really your fault point
• Quantity and urgency: forced outage or planned spares

Request a Quote for IS200RAPAG1BAA

This unit is used, cleaned, and tested; the condition and warranty statement is in the table below. Send your details via Request a Quote and we answer within 24 hours. We ship worldwide DDP and accept purchase orders. For the rest of the rack, browse GE Mark VI IS200 Boards and the full GE Speedtronic Turbine Control Boards catalog.

General Information about the Product
Part Number	IS200RAPAG1B Mark VI IS200
Description	GE General Electric IS200RAPAG1B IS200RAPAG1BAA Rack Power Supply Board Mark VI
Condition	used Cleaned and Tested. With 1 Year Warranty.