Designed for durability and a heavy work load. These switches are activated when the circuit is Brocken therefore eliminating the worry of worn out switch contacts due to vibration or failure due to high amp draw. Suitable for high and low voltage inputs, however this is not a regulator whatever goes in comes out. Has been tested to 14 amps for 10 seconds, amp limitation is only that which standard RC wiring is able to carry. Brand new.