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This is inexpensive protection for an electric fan and a vehicle's wire harness. Provides constant voltage, protects from voltage and amperage spikes and prevents the fan from back feeding voltage through the vehicle's wire harness. An absolute necessity if adding a dash mounted manual on/off switch to your electric fan circuit. This kit includes: Weatherproof SPST 35-amp relay, weatherproof 30-amp circuit breaker, weatherproof relay base with harness (6' input, 2' output), weatherproof heat-shrinkable Crimp-on terminals and mounting hardware.