A50P125-4 Ferraz Shawmut - Fuse

A50P125-4 Description

A50P125-4 is a 500 V, 125 A high speed fuse made by Mersen. Fast-acting fuses like this are used to protect rectifiers, inverters and other power-electronic circuits against short circuits.

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Summary of Features

Target Applications

Ferraz Shawmut A50P125-4 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) A50P125-4 is an Amp-Trap Form 101 A50P high speed fuse, 125 A, 500 VAC / 450 VDC, blade, bolt-in 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	125 A
Rated voltage	500 VAC / 450 VDC
Interrupting rating	100 kA AC / 79 kA DC (L/R 10 ms)
Mounting type	4: blade, bolt-in
Characteristics	Very fast acting, current limiting, low I²t, controlled arc voltage
Approvals	UL Recognized Component (JFHR2, file 60314): AC and DC
Overall length (A)	3.63 in (92.2 mm)
Body diameter / width (B)	1.22 in (31.0 mm)
Mounting hole centres (D)	74.7 mm
Matching fuse block	P243E

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