Next time a fuse is blown in your electrical circuit, replace it with a fuse from Bussmann. With time delay fuse speed, 4A fuse amps, an interrupt rating of 300kA at 600VAC, 100kA at 300VDC, and lps-rk-sp series, this fuse is a must-have. It is a nonindicating fuse. The body is made of melamine material. As far as size goes, it is 13/16" in diameter. When it comes to product classification, this item can be grouped as RK1. The voltage rating is 600vac/300vdc. It has a dual element. Functionally equal to Mersen/Ferraz Shawmut A6D-R, Littelfuse LLSRK, you'll thoroughly enjoy its use. Standards include: CE, UL Special Purpose Guide JFHR, Guide JDDZ, File E4273, CSA Class 1422-02, File 53787, CSA C22.2, No. 248.12.