The SQBW401R0JFASTON is a power wire-wound resistor designed for efficient thermal performance and high power dissipation. It is rated for 40W and has a resistance of 1.0 Ohm. The resistor is constructed with a wire-wound element on a ceramic core, enclosed in a ceramic case sealed with inorganic silica filler, providing an entirely fireproof design. Key electrical characteristics include a temperature coefficient of ±300ppm/°C, an insulation resistance of over 1000 MΩ, and the ability to withstand a short-time overload of 10 times its rated power for 5 seconds. This model includes solder lugs and a mounting bracket for secure horizontal installation, making it ideal for applications like capacitor pre-charge, capacitor discharge, and inrush current limiting.