Innovative solid state design eliminates the inaccuracy of thermal breakers. It also allows for more control over your circuits with selectable current (amperage) limit and more flexibility with selectable Manual or Automatic reset modes. The TRAC micro-processor monitors voltage and current in real time to automatically protect your 12-volt circuit from damage caused by overload or short circuit. If TRAC Digital Circuit Breaker detects a fault condition, the current flow will be interrupted at a very precise and user selectable amperage.