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A fully ready-to-install AC protection unit with galvanic isolation. The relay in the device has silver contacts and is switched by a powerful field-effect transistor, which makes the design more reliable. Suitable for amplifiers of any class. Links: Capacitors: https://sl.aliexpress.ru/p?key=fUHjrZ5 Terminals: https://sl.aliexpress.ru/p?key=fgHjrYj LED calculation: https://cxem.net/calc/ledcalc.php