Merit Brass A3T400 Class T Fuse 400 Amp

Product Description

The MERIT BRASS A3T400 is a Class T fuse rated at 400 amps, designed for high-fault-current protection in industrial and commercial electrical distribution systems. Class T fuses are recognized for their compact form factor relative to their current rating and their ability to clear high-level fault currents rapidly. This fuse is installed by licensed electricians in panelboards, switchboards, and disconnect enclosures where reliable overcurrent protection is required. Its current-limiting action helps protect downstream equipment from damage during fault conditions.

The A3T400 is suited for use in industrial facilities, commercial buildings, and heavy-duty electrical distribution applications where 400-amp overcurrent protection is required. Class T fuses are commonly specified in systems where space constraints make their compact dimensions an advantage over larger fuse classes. Installation is performed by qualified electricians following applicable NEC requirements.

Key Features

• Class T fuse construction for high-fault-current interrupting capacity
• 400-amp current rating for heavy-duty overcurrent protection
• Current-limiting design helps protect downstream components during fault events
• Compact form factor relative to ampere rating

Compatibility

Designed as an OEM-style replacement or direct-fit fuse for Class T fuseholders rated at 400 amps in commercial and industrial electrical distribution equipment.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit completely before removing or installing any fuse. Verify the fuseholder is rated for Class T fuses and matches the 400-amp rating before installation. Never install a fuse in a holder that does not match its class or ampere rating.

Technical Specifications

• Fuse Class: Class T
• Current Rating: 400 amps
• UPC: 78200189028

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A3T400