Mercury - 3-Amp Fuse Electrical Protection Marine-Grade Design 852526T. Overview. It's the little parts that keep you moving - the quiet protectors working behind the scenes so your boat runs without a hiccup. The Mercury 852526T 3-Amp Fuse might be small, but it plays a big role in keeping your outboard or sterndrive safe and steady. When you're miles from shore, you want to know every electrical component is protected from unexpected surges. This fuse gives you that peace of mind - it's tough,