The Emcotec DPSI 2001 RV power distribution unit is designed to operate with the included Fuel Cap magnetic switch actuator or a specially designed Magnetic Switch or Magnetic Switch PCB actuators. The switches are fail proof and they are controlled by self-locking circuitry. This means that DPSI 2001 RV stays turned On, even if the switch fails. The logic for turning Off is also redundant, a simple malfunction cannot cause the power supply to be turned Off. Find it here.