GE IS2020DRLYH1AA

Key Specifications

Advantages & Distinctive Features

• High-Capacity Relay Outputs: 16 individually isolated Form A relays with 6 A contact rating.

• High Inrush Capability: 12 A for 150 ms handles solenoid and motor starting surges.

• Integrated AC Snubbers: Built-in snubber circuits for AC inductive loads—extends contact life.

• Contact Resistance Monitoring: Tracks contact resistance over time—identifies pitted or worn contacts before failure.

• Contact Status Feedback: Auxiliary contact provides actual relay state to the processor.

• 1000-Event Fault Log with waveform snapshots—enables comprehensive post-event analysis.

• Conformal Coating Standard: Protects against humidity, salt spray, and chemical vapors.

• Widest Temperature Range: –30 °C to +75 °C operation—suitable for extreme environments.

• Condensing Humidity Rating: 5–100% condensing—suitable for offshore and unheated installations.

• Military-Grade Manufacturing: 120-hour burn-in, 100% X-ray/AOI, military-grade components.

• Gold-Plated Captive Washer Terminals: Corrosion-resistant and vibration-proof connections.

• Hot-Swappable: No rack power-down for replacement.

• Direct Retrofit: Replaces IS2020DRLYH1A and older WROB series boards.

Application Fields

• Gas Turbines: Solenoid control, motor starters, valve actuation, alarm annunciation

• Steam Turbines: Trip solenoid control, motor starters, drain valve control

• Compressors: Motor starters, solenoid control, surge control valves

• Generators: Alarm annunciation, motor starters, synchronizing control

• Balance of Plant: Pump control, fan starters, filter differential pressure alarms

• Offshore platforms: Salt-spray and condensing environments

• Arctic installations: Extreme cold (–30 °C) environments

• Desert power plants: Extreme heat (+75 °C) environments

• Chemical processing: Corrosive environments

• Nuclear power plants: Safety-critical relay control

Comparison with IS2020DRLYH1A and Competitors

The GE IS2020DRLYH1AA offers superior environmental tolerance, extended burn-in, and expanded diagnostics compared to the base H1A variant—making it the definitive choice for critical relay control in extreme environments.

Selection Guidelines

• When to choose:

  • Critical relay control applications requiring maximum reliability

  • Extreme environments (–30 to +75 °C, condensing, chemical exposure, salt spray)

  • Applications needing contact resistance monitoring and waveform logging

  • Maximum reliability (nuclear, critical infrastructure)

• When to choose “H1A” instead: For less extreme environments (non-condensing, –25 to +70 °C) where standard conformal coating suffices—the “H1AA” variant is typically more expensive; select only when environmental conditions warrant it.

• Load Verification: Verify each load ≤6 A continuous; ≤12 A inrush. Use integrated AC snubbers for inductive AC loads.

• Contact Resistance Monitoring: Use Toolbox ST to establish baseline—replace relays when resistance doubles.

• Coating Verification: Inspect under UV (365 nm)—uniform fluorescence indicates proper coating.

• Compatibility: Fits all Mark VIe VME64x racks. Requires ControlST v6.5 or higher for full features.

Operational Precautions

1. Wiring: Follow GE wiring diagrams—correct polarity for DC loads. AC loads use integrated snubbers—no external components needed.

2. Load Testing: Test each output with actual load during commissioning—verify contact resistance baseline.

3. Contact Resistance Monitoring: Review contact resistance trends in Toolbox ST—replace relays when resistance doubles from baseline.

4. Inrush Current: Ensure inrush current does not exceed 12 A per channel—excessive inrush can weld contacts.

5. LED Diagnostics: Green = commanded ON; Amber = commanded OFF; Red = fault. Refer to GEH-6920 for expanded blink codes.

6. Fault Log: Access 1000-event log via Toolbox ST for post-event analysis—waveform snapshots included.

7. Coating Care: Use GE-approved cleaner; inspect annually under UV—rework voids with approved coating per GE FSB.

8. Hot-Swap: Remove/insert slowly under power—processor auto-recognizes new module.

9. Spare Stock: Maintain 1 spare per 3–4 racks; “H1AA” backward-compatible with all DRLY and WROB sockets.

10. Annual Verification: Cycle relays during outages; verify switching times and contact resistance.

11. Firmware Updates: Ensure the GE IS2020DRLYH1AA is in “standby” mode during updates.

12. ESD: Handle by edges only with grounded wrist strap—coating does not protect connectors.

13. Storage: Anti-static bag with desiccant at –40 to +85 °C; rotate every 3 years for coating inspection.