SEL-TMU

Data Digitization—The SEL-TMU digitizes discrete I/O signals and analog data, such as voltages and currents, from primary equipment and transmits the data to a TiDL relay via point-to-point fiber connections. The SEL-TMU data stream is automatically and independently synchronized to each connected relay, eliminating the need for an external time source.

Data Sharing—An SEL-TMU can communicate with as many four TiDL relays over direct fiber-optic connections without the need for a network switch. This data-sharing capability gives you flexibility on how to best design protection for your system and makes installations more economical by reducing the device count.

Simple, Purpose-Built Hardware—With no user settings and no microcontroller, the SEL-TMU is easy to deploy and manage long-term. Pluggable, self-shorting CT connections increase personnel safety by providing an additional layer of protection and make swapping connections between SEL-TMU devices quick and easy.

Robust Self-Monitoring—The SEL-TMU provides robust self-monitoring to detect an out-of-tolerance condition within the device. If an out-of-tolerance condition occurs, the SEL-TMU takes appropriate action, such as disabling outputs on a detected failure to avoid spuriously tripping a breaker, and then alerts the connected TiDL relays.