DS3828BH3AH GE | Speedtronic Power Supply | OEM Surplus

Description

Product Introduction

The GE DS3828BH3AH is a high-temperature power supply module for the Speedtronic Mark V turbine control system, providing regulated DC power distribution for chassis backplanes and field devices in elevated ambient temperature environments. This board mounts directly into the Mark V rack, converting nominal 125 VDC plant battery power into isolated, regulated DC voltages required by CPU, I/O, and communication modules.

The “BH3AH” designation indicates a power distribution module with high-temperature-rated components and an enhanced thermal design. The “H” suffix signifies high-temperature capability: the board uses 105°C-rated capacitors, extended-temperature semiconductors, and improved thermal management that allows continuous operation at higher ambient temperatures. This variant was originally developed for Mark V installations in outdoor shelters, desert environments, and other applications where standard BH3A boards would experience reduced service life due to elevated cabinet temperatures.

Key Technical Specifications

Key Selling Points & Differentiators

• High-temperature components. Uses 105°C-rated capacitors and extended-temperature semiconductors for reliable operation in elevated ambient temperatures.
• Extended operating temperature range. Rated for -20°C to +70°C ambient, compared to 0-60°C on the standard BH3A.
• Complete chassis power solution. Provides +5V logic, ±15V analog, and +24V field power in a single slot.
• 100W output capacity. Sufficient for fully populated Mark V chassis configurations.
• Enhanced thermal management. Extended overtemperature shutdown threshold (85°C) and improved thermal design for sustained high-temperature operation.
• Yellow LED thermal warning. Provides early indication of elevated temperature conditions before overtemperature shutdown occurs.
• 48-hour burn-in at elevated temperature. Every unit is tested at 60°C ambient for 48 hours at full load, verifying high-temperature stability.
• 18-month warranty covering high-temperature performance. If the board fails to maintain regulation at high temperature or shows signs of thermal stress, we replace it.

Frequently Asked Questions (FAQ)

Q: What does the “H” suffix mean on the BH3AH?

A: The “H” suffix indicates high-temperature-rated components and enhanced thermal management. The board uses 105°C-rated capacitors (versus 85°C on standard BH3A), extended-temperature semiconductors, and has an extended operating temperature range (-20°C to +70°C versus 0-60°C). The thermal shutdown threshold is also extended to 85°C. This variant was designed for installations in outdoor shelters, desert environments, and other elevated-temperature applications.

Q: What is the difference between the BH3A and the BH3AH?

A: The BH3AH uses high-temperature components and has an extended operating temperature range. The standard BH3A is rated for 0-60°C, while the BH3AH is rated for -20°C to +70°C. The BH3AH also has a yellow LED thermal warning indicator and extended overtemperature threshold. Output specifications, pinout, and compatibility are otherwise identical.

Q: My cabinet is in an outdoor shelter and sees ambient temperatures of 45-50°C in summer. Should I use the BH3AH?

A: Yes—the BH3AH is specifically designed for this application. Standard BH3A boards are rated to 60°C, but at 50°C ambient, internal component temperatures may exceed safe margins, reducing service life. The BH3AH’s high-temperature components and extended thermal design provide a larger safety margin and longer service life in elevated-temperature environments.

Q: Does the BH3AH have a yellow LED that the standard BH3A doesn’t have?

A: Yes—the BH3AH has a yellow LED thermal warning indicator. When the board’s internal temperature exceeds approximately 70°C, the yellow LED illuminates, providing early warning before the overtemperature shutdown (85°C) occurs. This allows you to take corrective action (check airflow, reduce cabinet temperature) before the board shuts down.

Q: Can the BH3AH operate without forced-air cooling?

A: No—like all Mark V power supply modules, the BH3AH requires forced-air cooling (200 LFM minimum) to maintain safe operating temperatures. The high-temperature-rated components provide additional margin, but airflow is still required for reliable operation. Operating without forced-air cooling will reduce service life and may cause overtemperature shutdown.

Q: Is the BH3AH a direct replacement for the standard BH3A?

A: Yes—mechanical and electrical compatibility is 100%. Same form factor, same DIN connector, same pinout, same field wiring. The BH3AH drops into the same slot and provides identical output voltages and capacity. No software changes required.

Q: What is the warranty on the BH3AH?

A: 18 months from shipment, covering output regulation, high-temperature performance, and protection circuits. If the board fails to maintain regulation at high temperature or shows signs of thermal stress, we replace it. The warranty does not cover physical damage or miswiring.

Q: Do you have many BH3AH boards in stock?

A: The BH3AH is a specialized variant with limited production. We typically have 3-5 units in stock. If you need larger quantities, contact us directly to confirm availability. This board is particularly valuable for installations in desert, tropical, or unconditioned environments.

A-B 1756-RM2/A
EPRO PR6423/010-040+CON021
ABB UAC389AE02/HIEE300888R0002
Bently 3500/42