The GE IS200WROBH1A, also cataloged as the IS200WROB Power Distribution Board, operates as a dedicated hardware component for relay circuit protection and bus voltage monitoring within Mark VI turbine control platforms. The board incorporates 12 branch fuses rated at 3.15 A (500 VAC / 400 VDC) to protect localized branch control circuits across single, dual, or Triple Modular Redundant (TMR) cabinet configurations. Onboard sensing networks monitor core output feeds and distribute protected auxiliary power directly to system relays and associated feedback logic loops.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IS200WROBH1A |
| Brand | General Electric |
| Origin | USA |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions | 17.80 cm x 12.70 cm x 3.80 cm |
| Operating Temp | -30 to 65 deg C |
| Power Consumption | 24 VDC / 125 VDC system power distribution |
| Series | Mark VI |
| Product Type | Power Distribution Boards |
| Fuse Count | 12 branch circuit fuses |
| Fuse Rating | 3.15 A (500 VAC / 400 VDC) |
| Circuit Protection | Overcurrent isolation for branch relay outputs |
| Redundancy Support | Simplex, Dual, and TMR architectures |
Backplane Bus Communication and I/O Density Scaling
The IS200WROBH1A conditions and isolates branch circuit power independently from core system processors, preventing localized fault propagation across backplane bus communication velocity pathways. By routing power through isolated 3.15 A branch elements with built-in feedback sensing, the card maintains continuous operating voltages across high-density panel configurations. Onboard firmware flash compatibility across Mark VI control nodes ensures predictable bus timing and voltage monitoring synchronization in fault-tolerant TMR architectures.
Frequently Asked Questions
Q: What are the voltage and current ratings for the onboard fuses on the IS200WROBH1A?
A: The board contains 12 individual branch fuses, each rated for 3.15 A up to 500 VAC and 400 VDC.
Q: How does the board interface with Mark VI control platform redundancy?
A: The module supports Simplex, Dual, and TMR configurations, providing fanned branch distribution to maintain isolated power feeds across redundant controller sets.
Q: Does the IS200WROBH1A feature localized circuit sensing?
A: Yes, the card contains dedicated power sensing circuitry to verify voltage presence across branch outputs independent of PPDA feedback loops.
Field Installation Guidelines
- ESD Protection Practices: Wear a grounded anti-static wrist strap connected to cabinet frame ground prior to unpacking or touching the circuit board to prevent static damage to sensing components.
- Fuse Verification and Replacement: Verify that all 12 fuses are fully seated in their holders and match the specified 3.15 A, 500 VAC / 400 VDC rating before energizing the board.
- Mounting Hardware Alignment: Secure the card using non-conductive standoffs to maintain dielectric clearance from the panel rear plane, torqueing retention screws evenly.
- Wiring Strain Relief: Route all power input and branch output cables through cabinet channels, securing them to prevent mechanical stress on terminal block headers.
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