The HS103DR-MCPC4890C is a panel-mount heat sink designed to accommodate 1, 2, or 3 single or dual solid-state relays, or one 3-phase SSR. It features a thermal resistance of 1.0°C/W and a surface area of 227 in² (1470 cm²), constructed from black anodized aluminum for durability and corrosion resistance. The heat sink includes 6 mounting holes with 8-32 UNC-2B threads and accepts cooling fans up to 40 mm in size. With a weight of 0.97 lbs (440 grams) and mounting screw torque specifications of 15-20 in·lbs (1.7-2.2 N·m), this component is ideal for industrial control applications requiring efficient thermal management of multiple relay configurations.