{"product_id":"basler-electric-be1-81-o-overcurrent-protective-relay","title":"Basler Electric BE1-81 O Overcurrent Protective Relay","description":"\u003cdiv\u003e\u003cp\u003eBasler Electric BE1-81O\/U Digital Frequency Relay is a compact, single-phase, solid-state protective relay that monitors the frequency of the connected AC supply and triggers external control circuits or alarms when the frequency deviates from the preset threshold. It compares the measured frequency to a crystal oscillator reference and supports over-frequency and under-frequency protection (O\/U) with selectable time-delay characteristics, including definite-time and inverse-time options. Configuration is performed with front-panel thumbwheel switches, and Basler provides separate 50 Hz and 60 Hz variants to match the installed system. The relay outputs are designed to actuate external controls or alarms as part of protective schemes in generation, transformer, and distribution applications, enabling fast response to frequency excursions while maintaining reliability in industrial power systems. Typical applications include grid-supporting protection in generation facilities, standby power systems, and critical industrial processes where frequency stability is essential.\u003c\/p\u003e\u003c\/div\u003e","brand":"Basler","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51676708176174,"sku":null,"price":384.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_34268ad0-b27c-4e14-bf5e-3f1cbbe76bc2.jpg?v=1769552574","url":"https:\/\/plgautomation.com\/products\/basler-electric-be1-81-o-overcurrent-protective-relay","provider":"PLG Automation ","version":"1.0","type":"link"}