Hella Replacement 30 Amp SPST Mini-Relay with Bracket Relays switch high performance currents using low control current This guarantees the safe function of the connected consumers (lighting, preheating system etc ) and protects these and the on-board mains from overloading and damage This 40-Amp SPST (single-pole, single-throw) mini-relay is used with Hella's most popular auxiliary lights Please consult with your Hella light's manual for the correct relay part number