Shawmut A2K300R Industrial Grade Circuit Breaker

Shawmut A2K300R is a 300 A, 250 V class RK1 fast-acting fuse from Ferraz Shawmut (now Mersen) designed for current-limiting overcurrent protection in low-voltage circuits. As part of the A2K RK1 family, the device is UL-listed and CSA-certified, with an interrupting rating up to 200 kA RMS at 250 V, delivering rapid fault clearance in industrial power distribution. The 300 A, 250 V rating identifies a device intended to fit standard RK1 fuse holders and assemblies, with a fiberglass-bodied construction noted for dimensional stability in harsh industrial environments. It belongs to the RK1-class family of fast-acting fuses in Mersen's low-voltage protection lineup.