HWB60-AL Hard-Wired Boxes Littelfuse HWB60-AL Hard-Wired Boxes are an ideal fit for accessory circuits and overflow circuits from the main Power Distribution Module (PDM) and for smaller vehicles. The units can be used as the main vehicle module. Littelfuse HWB60-AL Hard-Wired Boxes feature durable construction and an IP67/IP69K rating. End users can customize circuitry utilizing direct wire-to-component connections.