T&D World Magazine

Serial Lock-Out Relay Provides Remote Trip and Reset

The new Electroswitch Series 24 Serial Lock-Out Relay (SLOR) is an addressable network device (certified DNP 3.0 protocol) that provides remote trip and reset capability, trip-coil monitoring, IRIG-B sequence-of-events reporting, system battery monitoring, self-diagnostic reporting and two auxiliary monitoring inputs available for customer use. A manual reset handle provides standard Lock-Out Relay local control.

The SLOR provides value by freeing up RTU (Remote Terminal Unit) points; reducing point-to-point wiring; simplifying load-shedding applications; and minimizing testing, commissioning and training. The SLOR combines the functions of multiple devices, allowing the elimination of separate equipment such as discrete battery monitors, a local/remote control switch, coil-monitoring lamps and additional reclosing relays.

The SLOR's standard Smart Nameplate provides a traditional mechanical target indicating trip/reset status as well as replaceable indicator LEDs for trip-coil monitoring, trip signal presence, serial-bus transmit/receive and local/remote status.

The SLOR is rated 30 A/600 V (continuous) with a circuit-breaker coil making ability of 95 A-125 VDC. UL interrupt ratings are 20 A-120 VAC, 15 A-240 VAC, 6 A-600 VAC, 3 A-125 VDC and 1 A-250 VDC. All Series 24 products meet the transient protection standards of IEEE C37.90.1 and IEC 61000-4-4 as well as IEEE C37.90.2, 90.3 and other applicable IEC Standards.

The SLOR is available in three, five or eight decks, and each enclosed deck contains two N/O and 2 N/C contacts. Rotor contacts are double-wiping, silver inlay phosphor-bronze. The rotary and stationary contacts contain silver alloy contact surfaces that provide exceptionally low contact resistance over the life of the product for low level applications.

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