GE DS3800HDRA1A1A

Technical Specifications

• Product Type: High-Density Relay Alarm Board (Revision 1A1A)

• Part Number: DS3800HDRA1A1A

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems

• Output Channels: 32 relay outputs – highest density in Mark IV relay family

• Contact Type: Form A (SPST – normally open) per channel (fixed)

• Contact Rating: 2A @ 250VAC or 2A @ 30VDC (resistive)

• Coil Voltage: 24Vdc (from backplane)

• Surge Suppression: Built-in flyback diodes per channel

• Protection: Coil over-current protection

• Indicators: Front-panel LEDs per channel

• Isolation: 1500Vrms opto-isolation (logic-to-field)

• Temperature Range: 0°C to +60°C

• MTBF: > 120,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Highest Relay Density: The GE DS3800HDRA1A1A provides 32 relay outputs on a single 6U board, maximizing rack space efficiency for alarm applications.

• Built-In Surge Suppression: Flyback diodes protect logic from inductive load spikes.

• Proven Reliability: Initial revision with long field track record.

• Diagnostic LEDs: Front-panel LEDs indicate output status per channel.

• Space-Saving Design: Reduces rack space requirements in large alarm systems.

Typical Application Cases

• Alarm Annunciation: Drives annunciator panels with 32 individual alarm points.

• Status Signaling: Sends turbine status signals to plant DCS or SCADA.

• Interlock Control: Provides relay contacts for safety interlocks.

• Space-Constrained Installations: Maximizes I/O density where rack space is limited.

Competitive Comparison

The GE DS3800HDRA1A1A is functionally identical to the base DS3800HDRA but with fixed Form A (NO) contacts only.

Selection Guidelines & Precautions

1. Contact Type: Fixed Form A (normally open) only. If Form C (SPDT) is required, use the base DS3800HDRA instead.

2. Contact Rating: Ensure load current does not exceed 2A per channel.

3. Inductive Loads: Use external suppression for loads exceeding the built-in flyback diode capability.

4. Wiring: Use appropriate gauge wiring for current loads.

5. ESD Handling: Use ESD-safe practices.

6. Sourcing: Obsolete. Request functional test report including all 32 channels tested.

7. Spare Strategy: Keep one spare GE DS3800HDRA1A1A on-site for critical high-density relay applications. If Form C contacts are required, consider the base GE DS3800HDRA instead.