FRS-R (600V) Bussmann Fusetron dual-element,time-delay fuse

Dual-Element, Time-Delay: 10 seconds (minimum) at 500% rated current
Ampere Ratings: 1/10-600 Amps.
Voltage Rating: 600 Volts AC (or less), 300 Volts DC
Current Limiting RK5 Fuse
Interrupting Rating: 200,000A RMS Sym. (0-100A, 201-600A), (20,000 AIC @ 250V DC).
Agency Approvals: UL Listed: Class RK5, Guide JDDZ, File E4273 CSA HRCI-R, Class 1422-02, File