Pollak 51-904EP Battery Master Disconnect Switch for GSE is a commercial-grade, lever-operated safety switch engineered to instantly cut off electrical power on airport ground support equipment. This heavy-duty, DPST (Double Pole, Single Throw) switch features a 4-stud terminal layout rated for 180 Amps continuous (1000 Amps intermittent), specifically designed to safely break the alternator or generator field circuit before disconnecting the main battery line to protect delicate electronics from voltage spikes. Built with a rugged, one-piece die-cast housing and O-ring environmental seals, it resists the intense vibrations, moisture, and dust typical of active tarmac environments, providing reliable anti-theft, maintenance isolation, and emergency shutdown protection.