A50P300-4K Ferraz Shawmut - Fuse

A50P300-4K Description

The Mersen A50P300-4K is a high speed fuse, rated for 500 V and 300 A. Fast-acting fuses like this are used to protect rectifiers, inverters and other power-electronic circuits against short circuits.

USComponent (Young & New Century LLC) supplies power modules, thyristors, diodes and other industrial components, including legacy parts. Contact us for a quote on the A50P300-4K, and please confirm ratings against the datasheet before ordering.

Summary of Features

Target Applications

Ferraz Shawmut A50P300-4K is used for protection of DC drives, uninterruptible power supplies (UPS) and other power electronic equipment of 500 V or less, including power semiconductor (diode, thyristor, IGBT) protection.

Key Specifications

Mersen (Ferraz Shawmut) A50P300-4K is an Amp-Trap Form 101 A50P high speed fuse, 300 A, 500 VAC / 450 VDC, blade, bolt-in (4K, round mounting hole) mounting. Source: Mersen A50P Amp-Trap Form 101 datasheet (HS 14-15, 2025).

Parameter	Value
Series	A50P Amp-Trap Form 101 high speed fuse
Rated current	300 A
Rated voltage	500 VAC / 450 VDC
Interrupting rating	100 kA AC / 79 kA DC (L/R 10 ms)
Mounting type	4K: blade, bolt-in (4K, round mounting hole)
Characteristics	Very fast acting, current limiting, low I²t, controlled arc voltage
Approvals	UL Recognized Component (JFHR2, file 60314): AC and DC
Overall length (A)	6.25 in (158.8 mm)
Body diameter / width (B)	1.50 in (38.1 mm)
Mounting hole centres (D)	120.7 mm
Matching fuse block	P266C

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