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With four visibly marked blade terminals, this relay was designed for horn installation but can also be used with compressors, power trunks and many other 12V applications. Has a 30A coil capacity and internal switch able to handle thousands of cycles. Relay features a mounting tab for easy installation and the case is made of durable hard plastic. Recommended for up to 10 minutes of continuous usage. Universal 12 Volt Horn Relay 30 Ampere / 12 V Ideal for Horns Recommended for temporary usage (Up to 10 minutes continuous)