Littelfuse 37004000430 Fast-Acting Radial Fuse 400mA 250VAC - Box of 175

The Littelfuse 370 Series is a family of fast-acting, subminiature fuses designed for board-mounted applications in electronic devices and circuits. This specific model, 37004000430, features a 400mA current rating and 250VAC voltage rating, making it ideal for protecting sensitive electronics from overcurrent conditions in consumer electronics, power supplies, lighting systems, and industrial controls. The radial lead design allows for easy through-hole mounting on PCBs, with a compact TR5 form factor that saves space. Key benefits include quick response to fault currents, high reliability, and compliance with international standards like IEC 60127-3 and UL. Advantages over similar products include Littelfuse's reputation for durability and consistent performance, with a breaking capacity of 35A at 250VAC, reducing the risk of arc flash or component damage. Drawbacks may include single-use nature (non-resettable) and the need for precise matching to circuit requirements to avoid nuisance tripping. These fuses are RoHS compliant and suitable for wave soldering processes. The box contains 175 units, appearing new and unused based on packaging and condition analysis. Applications span from appliances to telecommunications equipment, offering cost-effective overcurrent protection with minimal voltage drop.