Tyco power relay has contact ratings of up to 500 A dc

The Kilovac EV200 from Tyco Electronics is a small, low-price and hermetically sealed relay with contact ratings of up to 500 A dc. Developed for explosive and harsh environments, the relay is intrinsically safe with no oxidation or contamination of coils or contacts, providing stable contact resistance over years of use, including long periods of non-operation.