Basler Electric BE1-51 Solid-State Protective Relay

The Basler Electric BE1-51 Solid-State Protective Relay is a microprocessor-based, solid-state time-overcurrent relay designed for overload and fault protection on 50 Hz or 60 Hz power systems, with an adjustable current pickup and a simple hands-on HMI for local configuration (no PC required). It supports flexible input configurations—single-phase, two-phase with neutral, three-phase, and three-phase with neutral—and offers 16 field-selectable current-time curves to tailor protection to the application. Variants BE1-51/27C (single-phase time overcurrent with voltage control) and BE1-51/27R (three-phase time overcurrent with voltage restraint) add voltage-sensing options that improve selectivity without requiring external equipment. The BE1-51 family emphasizes accurate, repeatable protection while minimizing CT costs through a low-sensing-burden design and reducing battery drain with a low-burden power supply; it also meets surge-withstand standards for protective relays, such as ANSI/IEEE C37.90.1, underscoring its robustness in demanding substations and industrial environments.