New-surplus IC3600LRDH1B1D relay driver card

This IC3600LRDH1B1D is offered as new surplus — an unused original board held as a spare for GE Speedtronic Mark I / Mark II panels. Functionally it is the LRDH relay driver at revision 1B1D: a card in the IC3600LRD group that converts the control system's low-level commands into the switched outputs that energize the turbine's relays, and through them the valves, solenoids, ignition and contactors that actually run the machine. On an obsolete platform an unused board is worth keeping on the shelf, because a relay-driver failure can stop the turbine from responding to its own logic.

The card plugs into the control rack on an edge connector and carries a discrete transistor output for each relay channel. That construction is why relay-driver faults are usually localized, and it shapes how you should confirm a failure before pulling this spare from stock.

Confirm the driver is really the failed part

Because a new-surplus board is a valuable, finite resource, it is worth being sure the driver is genuinely at fault before you install it. A short, structured check settles it:

• Count the affected channels. One dead output points to a single transistor stage or to that relay and its wiring; every output dead points instead to board power, the common return or the edge connector. The pattern tells you where to look.
• Check power and the connector before the silicon. Confirm the card is seated, the edge fingers are clean and the supply to the board is present. Many whole-board symptoms are really connection or supply problems.
• Prove the command and the relay. Verify the logic command arrives at the input and that the relay coil and contacts are sound. A good driver cannot compensate for a welded contact or an open coil.
• Bench-test the suspect card if you can. Confirm the removed board actually fails to switch under test rather than inferring it from field symptoms alone.

This keeps the new-surplus LRDH1B1D in reserve until the fault is confirmed, and avoids installing a fresh board into a fault that was never on the card.

Decoding IC3600LRDH1B1D and why the suffix matters

IC3600 is the Mark I / Mark II card series, LRD the relay-driver group, H the driver variant and 1B1D the revision and dash detail. Two boards can both read “LRDH” and still differ where it counts — the 1B1D suffix distinguishes this card from a 1A or other revision. Match the full number when you order so the replacement drops into the same slot with the same behavior. See the GE Speedtronic Part Number Decoder for the detail.

Where the LRDH sits in the Mark I-II panel

In service the LRDH works next to the other relay drivers of its group (LRDC, LRDD, LRDJ) and the interface and selector cards of the IC3600SIX group, all feeding or reading the panel's relay logic. Stocking the correct driver revision as a spare, together with the matching relays, shortens any future outage. Explore the group in our GE Mark I-II IC3600 Cards collection and the broader range in GE Speedtronic Turbine Control Boards. Note that this IC3600 driver is specific to Mark I-II and does not interchange with later Speedtronic output modules; being a pre-TMR generation, it is single-channel driver hardware rather than a voted R/S/T output.

Quote-request information we need

To prepare an accurate quote, please provide:

• The complete part number and suffix as marked on the board, for example IC3600LRDH1B1D.
• A photo of the label and the board if available.
• Turbine model and Speedtronic generation (Mark I or Mark II).
• Quantity and your required delivery timeframe.

Request a quote for the new-surplus IC3600LRDH1B1D

This IC3600LRDH1B1D is new surplus, no box. Click Request a Quote and we will respond within 24 hours. We ship worldwide DDP, accept purchase orders from qualified organizations, and can advise on matching relays and companion cards to round out your spares.

General Information about the Product
Part Number	IC3600LRDH1B1D Mark I-II IC3600
Description	IC3600LRDH1B1D By GE Speedtronic IC3600LRDH Relay Driver Card NSNB
Condition	newSurplusNoBox With 1 Year Warranty.