Description
- Model & Brand: GE IC3603A-277A; the same hardware is frequently cataloged without the hyphen as IC3603A277A.
- Product Family: GE Mark I / Mark II Speedtronic, IC3600 series.
- Part Type: Thermocouple Averaging Module / thermocouple averaging assembly. Multiple legacy GE parts indexes identify IC3603A277A specifically as a thermocouple averaging module.
- Physical Construction: Large rectangular board/assembly with three rows of six toggle switches, a black identification strip, a smaller front plate, and retaining clips according to available physical descriptions.
- Physical Dimensions: Approximately 86 mm in board width and 28 mm in height is reported by one legacy supplier record; a complete W × H × D OEM mechanical drawing was not located, so the figure should not be used as a controlled packing dimension.
- Estimated Shipping Weight: Approximately 0.45 kg is reported by one supplier record. Use the actual packed weight for freight documents.
- What’s in the Box: Normally the IC3603A277A module/assembly only. Do not assume extender cards, mounting hardware, wiring harnesses, manuals, or spare switch hardware are included.
- Asset Condition Check: Because this is a legacy turbine-control component, inspect toggle switches, retaining clips, edge/interface contacts, soldered components, and visible conformal coating before acceptance.
Product Introduction
The IC3603A277A belongs to GE’s IC3600 Mark I/Mark II Speedtronic hardware family and is identified in multiple parts indexes as a thermocouple averaging module. Its role is associated with temperature-signal processing within legacy turbine control architecture, where several thermocouple measurements are combined for use by the control or protection system.
Physical descriptions show a manually configurable assembly with 18 toggle switches arranged in three rows. That matters during replacement. A spare with the correct catalog number but incorrect switch positions is not necessarily ready for installation (record the existing switch pattern before removing the failed assembly).
Core Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | General Electric |
| Catalog Number | IC3603A-277A |
| Alternate Catalog Format | IC3603A277A |
| Series | GE IC3600 |
| Control System Family | Mark I / Mark II Speedtronic |
| Product Type | Thermocouple Averaging Module |
| Primary Function | Thermocouple signal averaging / conditioning |
| Input Type | Thermocouple millivolt signals |
| Published Input Capacity | Up to 6 or 12 thermocouples, depending on system configuration |
| Reported Thermocouple Types | Type K / Type J in one supplier record; verify against the installed GE configuration |
| Reported Input Range | -10 mV to +50 mV in one supplier record |
| Reported Output | 0–10 VDC or 4–20 mA in one supplier record; verify before engineering substitution |
| Reported Input Impedance | >1 MΩ |
| Reported Accuracy | ±0.25% |
| Signal Conditioning | Low-pass filtering is reported |
| Reported Supply | +24 VDC |
| Reported Power | <5 W |
| Reported Relay Contact Rating | 24 VDC / 0.5 A in one secondary record |
| Approx. Weight | 0.45 kg |
| Approx. Board Size | 28 mm high × 86 mm wide |
| Operating Temperature | -40 to +70°C reported by one secondary source |
| Storage Temperature | -55 to +85°C reported by one secondary source |
| Configuration Hardware | 3 rows × 6 toggle switches |
| Mounting | Legacy Speedtronic card/rack or panel installation; exact arrangement is system-dependent |
There is an important documentation boundary here. The part type and Mark I/Mark II association are supported by several independent legacy indexes, but detailed electrical figures such as input count, thermocouple type, output format, temperature range, and relay rating come from a secondary supplier record rather than an identified GE OEM datasheet.
For engineering release, treat those detailed electrical fields as configuration data requiring verification against the plant’s original drawing, card documentation, or physical assembly. This is especially important because other IC3603A277 revisions, including 277B and 277C, are separately cataloged.
GE IC3603A-277A
🚨 Global Compliance & Industry Certifications
The IC3603A277A is a legacy Mark I/Mark II turbine-control component, and a reliable certification matrix for the exact catalog number was not located in the available public technical records.
- CE Mark: Not confirmed for the exact .
- UL / cUL: Not confirmed for the exact .
- ATEX: Not confirmed.
- IECEx: Not confirmed.
- Marine approvals such as DNV GL, ABS, BV, or LR: Not confirmed.
- RoHS: Do not assume compliance because the Mark I/Mark II platform predates many modern RoHS documentation practices.
For an auditor, the correct approach is simple: preserve the actual nameplate, revision identification, manufacturing evidence, and any project-specific certification documentation supplied with the asset.
A turbine protection component may sit inside a certified panel or system even when the individual legacy card does not carry a modern standalone hazardous-area certificate. Certification must therefore be assessed at the approved equipment/configuration level rather than inferred from the card’s function.
Verify specific lot certifications with OEM.
🚨 Long-Term Storage & Asset Preservation Guide
Protect the switch bank. The eighteen toggle switches are exposed mechanical interfaces and should not be subjected to repeated handling during warehouse inspections. Store the module in its original protective packaging and avoid stacking heavy material on top of the switch assembly.
Control moisture and contamination. Keep the PCB assembly in an ESD shielding bag or equivalent anti-static package, preferably in a temperature-stable, dry room around 40–60% RH, non-condensing. Corrosion at card contacts or switch terminals can create intermittent failures that are difficult to reproduce during bench testing.
Preserve configuration evidence. Photograph both sides of the assembly and create a switch-position record before placing it into long-term stock. Since the hardware uses manual toggle settings, this record may be more valuable than a generic functional description during an emergency replacement.
For strategic spares held for many years, inspect the retaining clips, switch actuators, connector/interface contacts, and visible board coating at scheduled inventory audits.
Physical Installation Prerequisites
The is not a modern DIN-rail PLC module. It belongs to a legacy Speedtronic architecture and must be installed in the correct rack, card position, or panel assembly associated with the original Mark I/Mark II system.
Match the existing hardware position first. Before removal, document:
- Card or rack location.
- Plug/socket orientation.
- Every toggle-switch position.
- Wire or harness identification.
- Adjacent card references.
- Grounding and shielding arrangements.
Do not invent a universal clearance specification for this legacy module. A reliable OEM mechanical installation drawing was not located for the exact , so cabinet service clearance should be taken from the original turbine control cabinet drawing and actual enclosure geometry.
Provide enough access to remove the card without contacting neighboring assemblies. A practical 50 mm service-access allowance around accessible edges can be useful during panel planning, but it is not an OEM-certified minimum for this specific part.
Thermocouple wiring deserves particular care. Keep low-level thermocouple circuits separated from high-current conductors and preserve the original shield and grounding scheme. A millivolt-level temperature signal is much more vulnerable to induced electrical noise than a typical 24 VDC discrete input.
Buyer’s FAQ — Logistics & Compliance Focus
Q1. What HS tariff code should be used for IC3603A-277A?
The likely customs family is HS 8537 when the item is treated as part of an electrical control apparatus, but classification of an individual legacy control card can vary according to its construction and the destination country’s tariff interpretation.
Do not treat a supplier’s national tariff extension as universally valid. Have the importer or customs broker confirm the final code before filing.
Q2. What Country of Origin should be declared?
One commercial record identifies the as USA origin, but COO should be supported by the physical asset and available traceability records rather than the brand name alone.
For compliance-controlled shipments, keep the origin statement consistent across the commercial invoice, packing list, Certificate of Origin, and customs declaration.
Q3. Should the module be insured during shipment?
For a legacy Mark I/Mark II turbine spare, insurance is prudent when replacement availability is limited. The PCB assembly and switch bank can be damaged by impact even when the external carton shows limited deformation.
Use ESD protection, rigid internal cushioning, and a moisture barrier. Photograph the exact catalog number and switch configuration before closing the package.
Q4. Does IC3603A-277A have firmware that needs to be verified?
No conventional firmware-loading process should be assumed. This is a legacy thermocouple averaging hardware assembly rather than a modern programmable Ethernet I/O module.
The important replacement variables are instead the exact revision, switch settings, electrical configuration, thermocouple wiring, rack position, and associated turbine-control drawing. The parts indexes separately list IC3603A277B and IC3603A277C, so the final suffix should remain part of the warehouse identity.
Start Chat
