The RHS300 is a heatsink assembly designed for mounting a single 3-phase solid state relay (SSR) with a thermal resistance of 5.4°C/W. It features DIN rail mounting capability and is constructed from aluminum with silver anodization finish, weighing approximately 205g excluding the SSR. The assembly includes thermal compound (HTS02S) and mounting hardware (M5x10mm screws with washers), with a maximum SSR mounting torque of 1.5 Nm and dimensions of 105 x 82 x 20 mm (W x H x D). The RHS300 is RoHS compliant and suitable for applications requiring efficient thermal management of 3-phase SSRs in industrial control systems, with recommended current ratings varying based on ambient temperature and thermal interface material used.