The 29-321-12 is a KISSLING Series 29 single-pole, change-over (NO/NC) power relay designed for robust performance in demanding environments. It handles a 300A continuous current and is controlled by a nominal 24/28V DC coil that operates within an 18-32V DC range. This relay features a sealed housing compliant with IP67 and IP6K9K standards, ensuring protection against dust and high-pressure water ingress. It is built to withstand high shock (6g) and vibration (4g) levels and operates reliably across a temperature range of -40°C to +85°C. Its durable construction and high-current capability make it ideal for use in trucks, buses, construction vehicles, and other commercial transportation applications.