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SEL-3094

Interface Converter

Convert electrical teleprotection interfaces to the IEEE C37.94 optical standard for improved safety, signal integrity, and longer distances. Connect an SEL-3094 to an ITU-T G.703, EIA-422, EIA-485, or EIA-232 device, and use up to 2 km of optical fiber to link to a C37.94 multiplexer. Similarly, connect an SEL-3094 to a noncompliant multiplexer, and use fiber to connect to a new teleprotection device and another SEL-3094 at the multiplexer to replace a G.703, EIA-422, EIA-485, or EIA-232 wire link with optical fiber.

Starting At

685 USD

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IEEE C37.94 Links—Link older relays with ITU-T G.703, EIA-422, EIA-485, or EIA-232 electrical interfaces to IEEE C37.94 compliant multiplexers or transfer switches. The IEEE C37.94 standard provides plug-and-play transparent communications between different manufacturers' teleprotection and multiplexer devices. The SEL-3094 Interface Converter features 850 nm wavelength optics.

Noncompliant Devices—Link an IEEE C37.94 compliant relay, like the SEL-311L Line Current Differential System, to a noncompliant multiplexer through an SEL-3094. Or, connect a noncompliant relay to a noncompliant multiplexer with two SEL-3094 Interface Converters.

Safe and Secure Communications—Install fiber-optic connections to isolate communications from ground potential rise and electrical interference.


IEEE C37.94 Standard Conversion
Converts electrical teleprotection interfaces to the IEEE C37.94 optical standard. Connect an SEL-3094 to an ITU-T G.703, EIA-422, EIA-485, or EIA-232 device, and use up to 2 km of optical fiber to link to a C37.94 multiplexer. Similarly, replace a G.703, EIA-422, EIA-485, or EIA-232 wire link with fiber, connecting a noncompliant multiplexer to a teleprotection device through a pair of SEL-3094 interface converters.

Easy Application
All settings are made with ten control switches. LEDs indicate the state of inputs, outputs, and the communications link

High Speed
Uses one 64-kilobit time slot in a digital multiplexer.

Improved Safety and Isolation
Fiber-optic connections provide isolation from dangerous ground potential rise, prevent induced electrical noise, and eliminate signal ground loops.

Universal Power
Power supply operates from 18 to 300 Vdc and 85 to 264 Vac.

Dual Side-By-Side Kit
Order the SEL-9921 combination package for two SEL-3094 Interface Converters connected by a side-by-side mounting bracket for a standard 19 inch rack. The bracket enables removal and installation of one SEL-3094 without taking the other one out of service, so one converter and communications circuit of a dual primary or primary-backup scheme remains in service while you are working with the other one.

Product Certifications

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