Mersen A3T400 Class T Fast-Acting Fuse, 400A 300VAC/160VDC Blade Amp-Trap

Mersen A3T400 Class T Fast-Acting Fuse, 400A 300VAC/160VDC, Blade Amp-Trap

The Mersen A3T400 is a Class T fast-acting fuse built on Mersen's Amp-Trap blade design, rated 400A at 300VAC and 160VDC for AC/DC circuit protection. Its bolted blade terminals and GMG body insulating material support demanding industrial power distribution applications where reliable, high-speed overcurrent interruption is required. With a 200 kA AC maximum interrupting rating and 50/60 Hz frequency compatibility, the A3T400 delivers dependable current-limiting protection for panelboards, switchgear, and motor control circuits.

Key Features

• Ampere Rating: 400A for high-capacity circuit protection in industrial power systems.
• Voltage Rating: 300VAC / 160VDC, rated for both AC and DC applications.
• Fast-Acting Class T Design: Rapid overcurrent response for sensitive equipment and circuit protection.
• Blade Amp-Trap Construction: Mersen's Amp-Trap current-limiting design in a blade-terminal format.
• Bolted Mounting: Secure bolted connection with copper connection terminal material for low-resistance contact.
• Body Insulating Material: GMG construction for durable electrical insulation.
• AC Max Interrupting Rating: 200 kA breaking capacity (I1) for high fault-current environments.
• Frequency: 50/60 Hz compatibility for standard power distribution systems.

Certifications & Compliance

• RoHS Compliant

Technical Specifications

• Ac Max I R Breaking Capacity I1: 200 kA
• Ac Or Dc: AC/DC
• Ampere Rating: 400 A
• Body Insulating Material: GMG
• Connection Terminal Material: Copper
• Frequency Hz: 50/60 Hz
• Mounting Method: Bolted
• Product Length: 2.75 in
• Product Weight: 0.272 lb
• Rated Voltage Ac Ul: 300 V
• Rated Voltage Dc Ul: 160 V
• Rohs Compliant: Yes

Typical Applications

• Industrial Power Distribution Systems
• Motor Circuit and Branch Circuit Protection
• Switchgear and Panelboard Overcurrent Protection
• AC and DC Electrical Systems Requiring High Interrupting Capacity
• Commercial and Industrial Electrical Installations

Why Mersen?

Mersen's A3T400 combines a bolted blade Amp-Trap design with copper connection terminals and a durable GMG insulating body to deliver dependable, current-limiting fast-acting protection at 400A. Backed by a 200 kA AC maximum breaking capacity and RoHS compliance, this Class T fuse is engineered for professional electrical work where consistent, code-compliant overcurrent protection matters.