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MERSEN FUSE 300V 400A T FUSE A3T400
Fast-acting Class T blade fuse rated for 300VAC and 160VDC at 400A, with high interrupting capacity of 200 kA and durable Amp-Trap® construction for industrial and commercial circuit protection.
£80.47
Why Choose the Mersen A3T400 Class T Fuse?
The Mersen A3T400 is a premium Class T fast-acting fuse engineered to deliver outstanding overcurrent and short-circuit protection for industrial and commercial electrical systems. As part of the trusted Mersen Amp-Trap® A3T series, it combines exceptional current-limiting performance with a compact blade design, making it ideal for high-current applications where maximum protection and space efficiency are essential.
Designed to interrupt high fault currents almost instantaneously, the A3T400 helps minimise damage to switchgear, conductors and connected electrical equipment. Its unique Class T dimensions prevent substitution with lower-rated fuse classes, helping maintain electrical safety and system integrity while reducing costly downtime.
With a rated current of 400 A, a 300 V AC / 160 V DC voltage rating and fast-acting performance, the Mersen A3T400 is ideal for protecting switchboards, panelboards, load centres, motor control centres and industrial power distribution equipment.
Key Advantages
- Compact Class T fast-acting industrial fuse.
- 400 A current rating for demanding power distribution applications.
- 300 V AC and 160 V DC voltage rating.
- Extremely current-limiting design helps minimise equipment damage.
- Fast fault interruption improves electrical system safety.
- Unique Class T dimensions prevent incorrect fuse replacement.
Key Features
- Mersen Amp-Trap® A3T Class T fuse series.
- 400 A rated current.
- 300 V AC / 160 V DC rated voltage.
- Fast-acting overcurrent protection.
- High interrupting capacity.
- Glass melamine body for dimensional stability.
- Blade terminal construction.
- Compact design for compatible Class T fuse holders.
Reliable Protection for Industrial Electrical Systems
Fast-acting Class T fuses interrupt excessive fault currents before they can cause significant damage to electrical systems. Their highly current-limiting characteristics reduce arc energy, thermal stress and mechanical forces, helping extend the operational life of switchgear and connected equipment.
The Mersen A3T400 is designed for demanding industrial environments where dependable overcurrent protection, high interrupting capacity and compact installation are essential for reliable power distribution.
Typical Applications
- Industrial switchboards.
- Panelboards and load centres.
- Motor control centres.
- Power distribution equipment.
- Industrial machinery.
- OEM electrical systems.
Technical Specifications
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| Current | 400 A | |
|---|---|---|
| Voltage | 300 V | |
| Fuse Type | UL class | |
| Fuse Class | Fast acting | |
| Item number | A3T400 | |
| Description | Fuse A3T - Class T - Fast-Acting 300VAC 160VDC 400A Blade Amp-Trap® | |
| EAN/UPC Code | 782001890285 | |
| Rated voltage AC UL | 300 V | |
| Rated voltage DC UL | 160 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 400 A | |
| AC or DC | AC/DC | |
| Fuse Class | Class T | |
| Speed/Characteristic | Fast-Acting | |
| Mounting | Bolted | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Connection/Terminal Material | Copper | |
| Connection/Terminal Type | Blade | |
| Product Diameter | 33.8 mm | |
| Product Length | 69.8 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 0.1315 kg | |
| Sell Pack Width | 35.1 mm | |
| Sell Pack Length | 35.1 mm | |
| Sell Pack Height | 73.2 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 0.1234 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen A3T400 used for?
The A3T400 protects industrial electrical systems against overloads and high-level short circuits using fast-acting Class T fuse technology.
What is the current rating of the A3T400?
The fuse has a continuous current rating of 400 A.
What voltage is this fuse rated for?
The Mersen A3T400 is rated for 300 V AC and 160 V DC applications.
What are the advantages of a Class T fuse?
Class T fuses provide extremely high current limitation, compact dimensions, rapid fault interruption and unique sizing that prevents substitution with lower-performance fuse classes.
Where is the A3T400 typically installed?
It is commonly installed in switchboards, panelboards, motor control centres, load centres and industrial power distribution equipment.
Trusted for Critical Circuit Protection
Mersen Amp-Trap® Class T fuses are trusted by electrical engineers, OEMs and panel builders worldwide for delivering dependable current limitation, high interrupting capacity and reliable protection in demanding industrial electrical systems.
