Inter-Relay Communications Solution – GE Multilin R7I-MDM8-02-002 | UR Series
Where This Product Is Used
The GE Multilin R7I-MDM8-02-002 Inter-Relay Communications Module is deployed in mission-critical power protection and control systems across a wide range of industrial environments:
- Utility Substations – Enables high-speed peer-to-peer GOOSE messaging between UR-series protection relays for bus differential and line protection schemes.
- Industrial Power Distribution – Coordinates protection zones in large manufacturing plants, petrochemical facilities, and data centers requiring fast fault isolation.
- Renewable Energy Plants – Integrates wind farm and solar plant protection relays into centralized SCADA and DCS architectures.
- Oil & Gas Facilities – Supports inter-relay communication in hazardous-area switchgear panels where deterministic response times are mandatory.
- Mining & Heavy Industry – Provides reliable relay-to-relay communication in electrically noisy environments with high electromagnetic interference.
- Rail & Transit Infrastructure – Used in traction power substations for coordinated protection of AC/DC distribution systems.
Technical Specifications
| Attribute | Value |
|---|---|
| Part Number | R7I-MDM8-02-002 |
| Manufacturer | GE Multilin (General Electric) |
| Series | UR Series (Universal Relay) |
| Module Type | Inter-Relay Communications Module |
| Slot Compatibility | UR Series chassis (8-slot horizontal/vertical) |
| Communication Protocol | IEC 61850 GOOSE, Peer-to-Peer (Direct I/O) |
| Fiber Ports | Multi-mode fiber optic (ST connectors) |
| Response Time | < 4 ms (GOOSE messaging) |
| Operating Temperature | -20°C to +60°C |
| Power Supply | Supplied via UR chassis backplane |
| Mounting | Plug-in module, hot-swappable |
| Approvals | CE, UL, CSA |
| Weight | Approx. 100 g |
Why Engineers Specify This Model
- Sub-4 ms GOOSE Messaging – Meets the most stringent IEC 61850 Performance Class P2/P3 requirements for high-speed protection schemes.
- Seamless UR Ecosystem Integration – Plug-and-play compatibility with the full GE Multilin UR relay family (T60, L90, B90, C60, D60, F60, G60, M60, N60, etc.).
- Fiber Optic Immunity – Galvanic isolation via fiber eliminates ground loop interference in high-voltage substation environments.
- Redundant Communication Paths – Supports dual-channel configurations for N+1 redundancy in critical protection schemes.
- Simplified Engineering – Native EnerVista UR Setup software support reduces commissioning time and configuration errors.
- Long Service Life – Designed to GE’s industrial-grade reliability standards with MTBF exceeding 100,000 hours.
Complete System Bill of Materials
For a complete inter-relay protection scheme using the R7I-MDM8-02-002, engineers typically specify:
- GE Multilin UR Series Relay Chassis (e.g., T60, L90, B90) × 2 or more
- R7I-MDM8-02-002 Inter-Relay Communications Module (one per relay) ✓ This item
- Multi-mode fiber optic patch cables (ST-ST, 62.5/125 µm)
- UR Series Power Supply Module (e.g., 9A, 9B)
- EnerVista UR Setup Software (GE Multilin, free download)
- IEC 61850 Configurator Tool (optional, for GOOSE dataset mapping)
Compliance & Industry Standards
- IEC 61850 – Edition 1 & 2 GOOSE messaging and peer-to-peer communications
- IEEE C37.90 – Relays and relay systems associated with electric power apparatus
- IEC 60255 – Measuring relays and protection equipment
- CE Marking – European conformity for EMC and Low Voltage Directives
- UL / CSA – North American safety certification
- RoHS Compliant – Restriction of Hazardous Substances
Quality Assurance & Sourcing
Konmask.com sources the GE R7I-MDM8-02-002 exclusively through verified industrial automation distributors and authorized supply chains. Every unit undergoes:
- Visual and dimensional inspection upon receipt
- Authenticity verification against GE Multilin part number databases
- Functional continuity check prior to dispatch
- Anti-static packaging with humidity indicator cards
- Traceable documentation (COC available on request)
All products are shipped with original manufacturer labeling intact. Counterfeit-free guarantee backed by our sourcing policy.
How to Source This Part
Ready to order the GE Multilin R7I-MDM8-02-002? Here’s how to get started:
- Request a Quote – Contact us at support@konmask.com for volume pricing and lead time confirmation.
- Phone / WhatsApp – Reach our technical sales team at +0086 19859288691 for urgent requirements.
- Add to Cart – In-stock units ship within 1–3 business days via DHL, FedEx, or UPS with full tracking.
- OEM / Project Orders – We support BOM-level procurement for EPC contractors and system integrators.
Application-Specific FAQ
Q: Is the R7I-MDM8-02-002 compatible with all UR Series relays?
A: Yes. It is designed for the universal UR chassis and is compatible with all UR-family relays including T60, L90, B90, C60, D60, F60, G60, M60, N60, and C30.
Q: What fiber type does this module use?
A: The R7I-MDM8-02-002 uses multi-mode fiber optic with ST connectors (62.5/125 µm). Single-mode variants are available in other GE Multilin module SKUs.
Q: Can this module be used for IEC 61850 GOOSE messaging?
A: Yes. It fully supports IEC 61850 Edition 1 and 2 GOOSE messaging for high-speed inter-relay tripping and blocking schemes.
Q: What is the maximum number of modules per chassis?
A: Up to 8 communication modules can be installed in a standard UR 8-slot chassis, depending on relay model and slot configuration.
Q: Do you provide a Certificate of Conformance (COC)?
A: Yes. COC documentation is available upon request for all orders. Contact support@konmask.com to request documentation.
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