IS200SRLYH2AAA I/O Pack | 8 Safety Relays, Extended Temp

Description

Product Introduction

Safety relays are the final trip path—they need to work when the emergency happens, even if that emergency occurs during a cold snap at –35 °C. The IS200SRLYH2AAA is the extended-temperature version of the safety relay module, built to keep the force-guided contacts opening and closing reliably from –40 to +70 °C. It has eight Form A safety relays with force-guided contacts, two auxiliary relays, and cold-rated relay coil drivers that pull in at 4.5 V instead of 5.0 V.

The “AAA” suffix means GE upgraded the relay coil drivers to cold-rated parts that maintain their pull-in voltage at low temperatures (standard drivers can drop out at –30 °C). The relays themselves are specified for a wider temperature range. The board has conformal coating. The contact monitoring and force-guided operation remain the same. This is the safety relay module for the turbine that needs to trip in the middle of a January blizzard.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The SRLYH2AAA gets the thermal chamber treatment—our 30-point inspection verifies relay response, force-guided operation, and coil pull-in at –40 °C and +70 °C.

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 “–SRLYH2AAA” clearly.

Visual Inspection. Magnifying lamp, full board scan. Conformal coating must be continuous. The cold-rated relays and coil drivers are visually confirmed. The 96-pin backplane connector shows zero wear.

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

• Cold soak (4 hours at –40 °C): Relay response test—<10 ms. Force-guided operation—NC opens when NO closes. Contact monitoring—welded contact detection. Coil pull-in test—reduce backplane voltage to 4.5 V—relays must still pull in.
• Hot soak (4 hours at +70 °C): Same tests—all specs must hold.
• Contact rating test at cold: Apply 2 A load—verify relay carries current.
• Auxiliary relay test at extremes: Command auxiliary relays—verify they change state.
• Isolation test: 2,500 V RMS—no breakdown.
• Thermal cycle: 3 cycles from –40 to +70 °C.
• 24-hour soak at 50 °C.

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 at extremes, force-guided operation, coil pull-in test, contact monitoring, isolation test, thermal cycle log, and a photo.

Field Replacement Pitfalls

The SRLYH2AAA handles temperature extremes, but installation mistakes are the same as the standard version.

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. Cold temperatures don’t increase the contact rating.

Force-Guided Contacts—Don’t Bypass the Monitoring. The contact monitoring is a safety feature. Keep it 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.

Auxiliary Relays—For Status Only. The two auxiliary relays are not force-guided and not rated for safety functions.

Cold Temperature Coil Pull-in—The “AAA” Holds at 4.5 V. The cold-rated drivers pull in at 4.5 V. But if the backplane voltage drops below 4.5 V at –40 °C, the relays won’t pull in. Ensure your rack power supply is sized for cold-temperature operation.

ESD. The relay drivers are sensitive. Strap up.

New Original vs. Refurbished: Why It Matters

The SRLYH2AAA has cold-rated relays and coil drivers—refurbishers can’t add these.

What “New Original (New Surplus)” means. This IS200SRLYH2AAA came from GE’s factory with the cold-rated components and coating. We break the seal only for testing.

Refurbished risk in plain terms. A refurbisher may buy a standard SRLYH2A, clean it, and sell it as an “AAA.” At –40 °C, the standard coil drivers don’t pull in at 4.5 V—the relays won’t energize. I’ve tested refurbished “AAA” units that were actually standard SRLYH2As—they failed the cold soak coil pull-in test. Failure rate on refurbished extended-temp safety relay modules runs 5× higher than new.

Real cost of a refurbished failure. A relay fails to energize at –35 °C—a fuel solenoid doesn’t de-energize—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 IS200SRLYH2AAA we ship: a photo of the OEM packing slip, serial traceability to GE’s records, a full test report that includes relay response at –40 °C and +70 °C, force-guided operation, coil pull-in test, contact monitoring, isolation test, thermal cycle log, 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 extended-temperature safety relay testing, and a 12-month warranty.

Performance Benchmarks & Test Results

Data from our Mark VIe test rack, environmental chamber-controlled. Firmware v5.3.

• Relay response at –40 °C: 8.8 ms—under 10 ms.
• Relay response at +70 °C: 8.2 ms—under 10 ms.
• Coil pull-in at –40 °C: 4.5 V—relays pulled in successfully.
• Force-guided operation at –40 °C: NC opened when NO closed—verified.
• Contact monitoring at –40 °C: Welded contact simulated—fault flagged in 22 ms.
• Contact rating at –40 °C: 2 A load—relay held.
• Isolation test: 2,500 V RMS—no breakdown. Insulation resistance >100 MΩ.
• Thermal performance: At 70 °C ambient, the module ran at 58 °C—under the 85 °C rating.
• Reliability estimate: MIL-HDBK-217F gives a demonstrated MTBF of 52,000 hours at 40 °C—that’s 5.9 years.

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