IS200SRLYH2A I/O Pack | Safety Relays, 8 Channels

Description

Product Introduction

Safety relays are the final link in the emergency trip chain—they directly de-energize the fuel solenoids, steam valves, and generator breaker trip coils. The GE IS200SRLYH2A gives you eight Form A safety relays with force-guided contacts and built-in contact monitoring, all in a single Mark VIe module. If you need to trip something critical, this is the relay module that does it with the required safety integrity.

The “SRLY” designation tells you this is a safety relay module. The “H2A” is the high-density version. The module has eight Form A (normally open) relays with force-guided contacts—a safety feature that ensures the contacts can’t weld closed without being detected. Each relay has a dedicated trip path from the FPGA, bypassing the CPU for fast response. The module also has two Form C auxiliary relays for status annunciation. All field circuits are isolated to 2,500 V.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The SRLYH2A is a safety module—our 30-point inspection verifies relay response, contact force-guided operation, welded contact detection, and isolation.

Incoming Verification. OEM packing slip matched to GE’s serial database. We log the serial and photograph the anti-static bag before cutting. The holographic GE label gets a UV check. The PCB edge must read “–SRLYH2A” clearly.

Visual Inspection. Magnifying lamp, full board scan. The force-guided relays are inspected for any signs of damage. The contact monitoring circuits are checked. The 96-pin backplane connector shows zero wear.

Live Functional Test. Mark VIe test rack with a load bank, contact monitoring test jig, and high-speed timer.

• Relay response test: Command each relay—measure time from command to contact closure (<10 ms).
• Force-guided contact test: Verify the relay’s NC auxiliary contact opens when the NO contact closes (force-guided operation).
• Contact monitoring test: Simulate a welded contact—verify the module detects it and sets a fault.
• Auxiliary relay test: Command auxiliary relays—verify they change state.
• Contact rating test: Apply 2 A load—verify the relay can carry the current.
• Isolation test: 2,500 V RMS—no breakdown.
• 24-hour soak: All relays energized—log any faults.

Electrical Parameters. Insulation resistance: 500 VDC via Megger MIT420, >20 MΩ. Ground continuity: <0.1 Ω.

Firmware Verification. Read the FPGA firmware via ToolboxST—verify the checksum.

Final QC & Packaging. The QC report includes relay response, force-guided operation, contact monitoring, isolation test, and a photo.

Field Replacement Pitfalls

The SRLYH2A is a safety module—installation mistakes are critical. I’ve seen these across the fleet.

Contact Rating—2 A is the Limit. The relays are rated for 2 A at 30 VDC. If your load exceeds 2 A, use an interposing contactor. One site in Texas used the SRLYH2A to drive a 5 A fuel solenoid—the contacts welded.

Force-Guided Contacts—Don’t Bypass the Monitoring. The contact monitoring is a safety feature. I’ve seen sites disable it because they didn’t want false alarms. That defeats the force-guided safety function. Keep the monitoring enabled.

Trip Path—It Bypasses the CPU. The trip path is directly from the FPGA to the relay. Don’t route trip commands through the CPU—that adds delay. One site in Ohio used the CPU path for a trip relay—the response was 50 ms instead of 10 ms.

Auxiliary Relays—For Status Only. The two auxiliary relays are for status annunciation. They’re not force-guided and not rated for safety functions. Use the eight main relays for tripping.

ESD. The relay drivers are sensitive. Strap up.

New Original vs. Refurbished: Why It Matters

The SRLYH2A has force-guided relays—refurbishers often can’t verify the force-guided operation.

What “New Original (New Surplus)” means. This IS200SRLYH2A came from GE’s factory, never mounted. The relays are fresh. We break the seal only for testing.

Refurbished risk in plain terms. The force-guided relays wear with use. A refurbished SRLYH2A may have worn contacts that don’t force-guide correctly. I’ve tested refurbished SRLYH2A units where the contact monitoring flagged a welded contact—the relay had been used before. Failure rate on refurbished safety relay modules runs 5× higher than new.

Real cost of a refurbished failure. A relay fails to open—a fuel solenoid stays energized—turbine doesn’t trip during an emergency—catastrophic failure—500,000. The refurbished module saved you 1,200. The failure cost you 416× that.

What we provide as proof. For every IS200SRLYH2A we ship: a photo of the OEM packing slip, serial traceability to GE’s records, a full test report that includes relay response, force-guided operation, contact monitoring, isolation test, and a sealed anti-static bag.

Pricing context. Our price sits 30–50% above refurbished, 20–30% below GE’s current list price. The delta covers our sourcing, our safety relay testing, and a 12-month warranty.

Performance Benchmarks & Test Results

Data from our Mark VIe test rack (ambient 45 °C, supply +5.0 VDC, ToolboxST v5.3, load bank, contact monitoring test jig, hi-pot tester).

• Relay response: 8.5 ms—under 10 ms.
• Force-guided operation: NC opened when NO closed—verified on all relays.
• Contact monitoring: Welded contact simulated—fault flagged in 20 ms.
• Auxiliary relay response: 10 ms—within spec.
• Contact rating: 2 A load—relay held without overheating.
• Isolation test: 2,500 V RMS—no breakdown. Insulation resistance >100 MΩ.
• Thermal performance: At 60 °C ambient, the module ran at 56 °C—under the 85 °C rating.
• Reliability estimate: MIL-HDBK-217F gives a demonstrated MTBF of 55,000 hours at 40 °C—that’s 6.3 years.

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