The MF-R040 from Bourns is a polymeric positive temperature coefficient (PPTC) resettable fuse designed to protect circuits from overcurrents. It features a 60v max, 40 amps max hold, and .40 trip and .80max resettable rating. The fuse is suitable for a variety of applications including overvoltage, overcurrent and DPST and has an operating temperature range between -40°C to +125°C. It also acts as an alternative to traditional fuses and provides long-term protection for any circuit. The product features low resistance and can handle up to 40 amps continuous, withstanding a peak instant of up to 80 amps. It also provides a fast response time under 10 milliseconds.