Rated voltage: 12V or 24V (12V is commonly used for passenger cars and 24V is used for commercial vehicles). Rated current: 1A~50A (depending on load requirements, small current devices such as car lights and sensors use 1A~5A, while motors may require 10A or more). Contact resistance: usually requires ≤ 10m Ω (lower for high current applications). Insulation resistance: ≥ 100M Ω (under 500V DC test conditions). Voltage endurance: 500V~1000V AC/1 minute (anti breakdown test).