The SD55WBB is a miniature surface-mount thermal cutoff (TCO) device designed to provide overtemperature and overcurrent protection in automotive applications. It features a trip temperature of 55°C with a reset temperature minimum of 20°C, and is rated for DC 14V / 8A continuous operation with 10,000 cycle endurance. The device offers high corrosion resistance, is AEC-Q200 compliant, and operates reliably across an application temperature range of -40°C to +125°C. Its small body size, RoHS compliance, and halogen-free construction make it ideal for modern automotive electrical systems where space is limited and environmental regulations must be met.