Ferraz Shawmut A4BY1200 Amp-Trap® A4BY Current Limiting Time Delay Fuse, 1200 A, 600 VAC/300 VDC, 200/100 kA Interrupt, Class L

Amp-Trap A4BY fuses have been the industry's favorite when it comes to protecting service entrance equipment, feeder circuits, and circuit breakers. The A4BY is a 100% rated device and may be applied at continuous currents up to its ampere rating. A 4-second minimum time delay at 500% rating allows the A4BY to pass normal current surges and to coordinate with ground fault relays.