The H-J Family of Companies helps you properly size and select the electrical and mechanical protective devices for your transformer designs. From fuse-breaker coordination to Buchholz relay and pressure relief valve sizing, our team is ready to help you. Our Electrical Protection Solutions include Expulsion and Current Limiting Fuses, Breakers, and Arresters. In contrast, our Mechanical Protection Solutions include components with or without contacts, like Thermometers, Oil level indicators, Pressure-vacuum indicators, Buchholz relays, and much more.