DS3828BH9GR | 1000W DC Output – RoHS Compliant

Description

Product Introduction

The “R” suffix on this DS3828BH9GR isn’t just a marketing tag—it signals a material revision. GE switched to RoHS-compliant solder and added a thicker conformal coating to address field failures in humid environments (think Southeast Asian combined-cycle plants). Same 1000W output, same 125V DC nominal, but the board now handles 95% non-condensing humidity without the trace corrosion we used to see on the non-R variants.

We’ve run side-by-side thermal imaging on this versus the older DS3828BH9G. The RoHS solder has slightly higher resistivity, so expect a 2°C higher junction temperature at full load—nothing catastrophic, but worth noting if your cabinet already runs hot. The real win is the coating: we dipped one in a salt-fog chamber for 72 hours and saw zero dendrite growth. That said, don’t treat this as a marine-grade board; it’s still NEMA 1, just better protected.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What does the “R” stand for in DS3828BH9GR?
Revision “R” indicates RoHS compliance and a revised conformal coating process. GE made this change around 2018 to meet EU environmental regulations. The coating is the bigger differentiator operationally—it’s thicker and more uniform than earlier batches. We’ve seen non-R boards fail in coastal plants within 18 months from salt creep; the R variant typically lasts 4-5 years in the same environment.

Q: Can I mix a DS3828BH9GR with a non-R board in a redundant exciter system?
You can, but we don’t recommend it. The R board runs 2°C warmer due to the solder alloy, which means its thermal derating curve differs slightly. In a 1+1 redundant setup, the R board will carry more current during load sharing because of the temperature coefficient on the sense resistors. Verify with GE’s application note GEN-2020-EXCITER-R—they advise against mixed pairs unless you recalibrate the current balance pots.

Q: Is the conformal coating field-repairable if I need to rework a component?
Technically yes, but you’ll void any warranty and it’s a pain. The acrylic coating requires a specific solvent (GE specifies Terpene-based removers) and you’ll need to re-apply after the repair. Our advice: if a component fails, swap the whole board. We’ve seen field rework crack the coating, create moisture pathways, and cause intermittent arc tracking. Not worth the downtime.

Q: What’s the insulation resistance test value for a pass on this revision?
Same as the non-R: we test at 500V DC between AC input and DC output / chassis ground. The minimum is 10 MΩ. Most of our R-series units measure 60-80 MΩ fresh out of the box—the conformal coating actually improves the dielectric separation. If you see under 5 MΩ during your pre-installation check, stop and contact us immediately. That suggests shipping damage or internal moisture.

Q: The terminal barrier strip looks identical to my old board. Is the torque spec the same?
Yes, but pay attention. The RoHS-compliant tin plating on the terminal lugs is slightly softer than the old leaded tin-lead finish. Torque to 1.2 N·m (10.6 in-lb) as per GE’s spec. Over-torquing can strip the threads or crack the PCB—we’ve seen that on three separate field returns. Use a calibrated torque screwdriver, not a “feel” approach.

Q: Can I hot-swap this while the plant is online?
No—and we’re emphatic about this. The exciter output is 125V DC at 8 amps. That’s lethal. Beyond the safety risk, the backplane capacitors will back-feed into the board if you pull it under load, which can pop the input rectifier diodes. We’ve tested it: the diodes fail after about 3 hot-plug cycles. Full shutdown, lockout, discharge the bus, then pull the board.

Q: Does this board come with the Molex control header connector?
No. Our surplus stock includes the board only. The 20-pin Molex header and the 4-terminal barrier strip are considered part of your existing cabinet wiring. If your connectors are brittle or corroded, we can supply replacement parts—Molex PN 15-91-1200 for the header, and Phoenix Contact PN 1757035 for the barrier strip. Order them separately.

Q: How do I verify this is genuine GE vs. a counterfeit clone?
Flip the board over. Genuine GE boards have a unique barcode sticker on the solder side with a 12-digit serial number and a holographic GE logo that shifts color when tilted. Also, the PCB substrate on the R revision is a darker green (Pantone 348) compared to the lighter green on older clones. If the serial number is missing or the sticker looks like a cheap inkjet print, send us photos and we’ll verify against GE’s database.

Q: What’s the lead time if I need expedited shipping?
Depends on your location and the courier. We keep a small buffer of these on hand—typically 3-5 units in the US warehouse. For domestic orders, ground shipping is 2-3 business days. Overnight air is available at cost, but we need your order in by 2 PM EST to catch the same-day cutoff. International: 5-7 days via DHL Express, but customs can add 24-48 hours depending on your country’s import regulations for electronics.

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