Finlandia / Harvia Part # FH145 2.5Ah Ceramic Fuse for power supply is the specified protective link that helps keep your sauna’s electrical system safe and stable. Designed for Finlandia and Harvia power units, this 2.5 amp-hour ceramic fuse is calibrated to interrupt the circuit if an overload or fault occurs, shielding sensitive boards, controls, and wiring from costly damage. The robust ceramic body tolerates elevated temperatures near heaters and transformers far better than standard glass fuses, making it well suited to demanding sauna environments. Two fuses are typically required per power unit, ensuring balanced protection across the system. When replacing blown or aging components, choosing this genuine Finlandia / Harvia fuse helps maintain factory safety specifications, supports reliable heater operation, and preserves peace of mind every time you bring your sauna up to temperature.