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Woodward’s LS-5 Series relays are synchronizer controllers with integrated mains de-coupling and protection features. The applications range from independent synch check relay to complex power management with multiple utility feeds, bus tie-breakers and group breakers in combination with Woodward’s easYgen-3400XT/3500XT equipped genset controllers. Wiring efforts are reduced to a minimum, since only one CAN bus connection is required between all LS-5 and easYgen controllers to transmit AC meas-urement signals, I/O states, flags, etc. The LS-5×1 devices manage synchronization, loading and un-loading on each bus seg-ment and send the required voltage, frequency and phase angle references via CAN bus to the easYgen-3400XT/3500XT genset controllers. When serving an incoming mains breaker it automatically detects mains failure, performs mains decoupling and sends the start signal to the easYgen. The LS-5×1 is software selectable to be applied as an inde-pendent synch check relay, mains circuit breaker control or bus tie-breaker control thereby providing exceptional versatility and value for OEM switchgear builders, genera-tor packagers, and system integrators. The LS-5×1 Series is available in two different mounting styles. An LS-521 with a plastic housing and graphic LCD display is designed to be mounted on the cabinet’s front door. An LS-511 with an aluminum powder coated housing without display is designed to be back panel mounted.