This starter relay switch is a high-quality replacement compatible with Polaris OEM 4011087 and 3087198. It adopts high precision electronic components and reinforced shell structure to adapt to complex outdoor and off-road working environments. Simple plug-and-play installation without cutting or wiring modification. It effectively stabilizes the starting circuit, protects battery and starter motor, and perfectly repairs hard starting and electrical connection faults for Polaris off-road vehicles.