DS200RTBAG3AHC: The Group 3 Relay Terminal Board

Within GE's Mark V-era DS200 board family, the RTBA acronym designates the relay terminal board — an optional card that adds a bank of ten relay outputs to a drive or exciter installation. The unit on this page is the Group 3 configuration at revision AHC, supplied as new surplus, open box, factory packaged. Like its sibling groups, the G3 mounts in the drive or exciter cabinet, where its relays switch external circuits under system control; it is not one of the cards found inside the Mark V panel cores <R>, <S>, <T> or <C>. Across the RTBA family the relay complement runs K20 through K29 — a mix of DPDT and 4PDT plug-in relays, each with an LED that indicates when the relay can be energized — with field wiring on screw terminals and board I/O carried to the companion LTBA board over a 16-pin and a 2-pin connector. GE's instruction manual GEI-100167 documents the family's relay assignments, jumpers, and connections; use it, together with your board label, to confirm the details that apply to the Group 3 build specifically.

Is the Board Actually Dead? A Field Checklist

Before this or any RTBA goes on a purchase order, spend a few minutes disproving the alternatives:

• One output stuck, LED lit: suspect the individual relay. RTBA relays are plug-in and individually replaceable — move a known-good relay into the suspect position and watch whether the problem follows the part.
• One output stuck, LED dark: the enable never reached the board. Trace the pilot-relay command path and the ribbon to the LTBA before condemning the RTBA.
• A group of outputs dead together: that pattern usually means power routing or a configuration jumper, not ten simultaneous relay failures. The family's Berg-type jumpers ship at factory settings — a replacement must be set to match the board it replaces, so verify jumpers on both boards.
• Erratic loads: screw terminals loosened by vibration mimic contact failure. Torque-check the field wiring first.

If the symptom survives all four checks, the board itself is the credible suspect and a replacement is justified.

Group Letters and Revision Letters, Explained

The string DS200RTBAG3AHC divides into four fields. DS200 places the board in the Mark V-era series. RTBA states its function. G3 is the group — GE manufactured the RTBA in several distinct factory configurations, and the group digit is a hard matching criterion: a Group 3 board replaces a Group 3 board. AHC is the revision block, read under the usual DS200 convention as functional revisions A and H plus artwork revision C. Revision letters matter less than the group for fit, but your controls engineer — or our team — should still see the full string before a swap. The format is unpacked field by field in our GE Speedtronic Part Number Decoder.

Where the RTBA Sits in the Larger GE Lineup

Functionally the RTBA is a terminal-level board: real-world wiring on one side, the LTBA companion board and the control system on the other. It shares cabinets and vintage with the wider DS200 range of control, excitation, and drive electronics — mapped out in GE Mark V DS200 Boards Explained — and successor plants running Mark VI will find the equivalent roles filled by IS200-prefixed hardware, a transition covered in Mark V vs Mark VI: DS200 to IS200. To see what else we stock from this generation, browse GE Mark V DS200 Boards and the full GE Speedtronic Turbine Control Boards collection.

Preparing Your Quote Request

• Full part number with suffix — DS200RTBAG3AHC — transcribed from the label, or better, photographed.
• Confirmation that your existing board is Group 3, since groups are not interchangeable.
• Turbine or drive model and the role the relay outputs play at your site.
• Mark V architecture (Simplex or TMR), quantity, and destination country.
• Timeline: emergency replacement, planned outage, or spares stocking.

Request a Quote for This Group 3 Board

This DS200RTBAG3AHC is new surplus, factory packaged, with the one-year warranty recorded below. Submit a Request a Quote and we will respond within 24 hours — worldwide DDP shipping, purchase orders welcome.