Bel Fuse is a multi-faceted electronics components manufacturer with products that include surface-mount fuse blocks, terminal blocks, relays, and terminal blocks products. The company's SM4 product line is an enhanced line of fuse blocks featuring superior holding force that can reduce the risk of contact failure in harsh environments. The SM4 series offers a range of fuse block sizes, including 4-pole, 5-pole, and 6-pole styles, and PCB-based micro-fuse blocks, as well as automotive-style fuse blocks for use in energy management, distribution, and control applications. In addition to superior performance, the SM4 series provides superior protection from dust and moisture, making them suitable for use in any environment, from the desert to the seashore. The SM4 fuse blocks are also designed with water tight construction and vibration resistant mounting, making them a reliable and resilient solution for a variety of applications.