Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE 300V 450A T FUSE A3T450
Fast-acting Class T blade fuse with 450A rating, suitable for AC/DC applications up to 300VAC and 160VDC, featuring high breaking capacity and bolted mounting.
£97.46
Why Choose the Mersen A3T450 Class T Fast-Acting Fuse?
The Mersen A3T450 is a premium Class T fast-acting fuse designed to provide outstanding overcurrent and short-circuit protection in industrial and commercial electrical distribution systems. As part of the proven Mersen Amp-Trap® A3T series, it combines exceptional current-limiting performance with a compact footprint, helping safeguard critical electrical equipment while reducing downtime.
Manufactured with a durable glass melamine body and high-quality blade terminals, the A3T450 delivers reliable protection under demanding operating conditions. Its unique Class T dimensions prevent substitution with lower-rated fuse types, helping ensure safe, compliant electrical installations.
Rated at 450 A with a 300 V AC / 160 V DC voltage rating, the Mersen A3T450 is ideal for protecting switchboards, panelboards, load centres, circuit breakers and industrial power distribution equipment where high interrupting capacity and rapid fault clearing are essential.
Key Advantages
- Compact Class T fast-acting fuse for industrial electrical protection.
- 450 A current rating for high-current applications.
- 300 V AC / 160 V DC rated voltage.
- Extremely current-limiting design reduces equipment damage during faults.
- High interrupting capacity for demanding industrial installations.
- Unique Class T dimensions prevent incorrect fuse replacement.
Key Features
- Mersen Amp-Trap® A3T Class T fuse series.
- Fast-acting fuse characteristic.
- 450 A rated current.
- 300 V AC / 160 V DC voltage rating.
- 50 / 60 Hz operation.
- Knife blade terminal design.
- Glass melamine body for excellent dimensional stability.
- Permanent blade-stamped catalogue identification.
Reliable Circuit Protection for High-Power Systems
The Mersen A3T450 is engineered to interrupt high fault currents rapidly, minimising thermal and mechanical stress on downstream electrical equipment. Its exceptional current-limiting performance helps protect motors, transformers, switchgear and distribution equipment while improving overall system reliability.
Widely specified by electrical engineers, OEMs and panel builders, the Amp-Trap® A3T series delivers dependable protection for industrial power systems where fast fault interruption and compact installation are critical.
Typical Applications
- Industrial switchboards.
- Power distribution panels.
- Load centres.
- Circuit breaker protection.
- Metering centres.
- Commercial and industrial electrical distribution systems.
Technical Specifications
Tick the specs you need, then view products that match.
| Current | 450 A | |
|---|---|---|
| Voltage | 300 V | |
| Fuse Type | UL class | |
| Fuse Class | Fast acting | |
| Item number | A3T450 | |
| Description | Fuse A3T - Class T - Fast-Acting 300VAC 160VDC 450A Blade Amp-Trap® | |
| EAN/UPC Code | 782001890292 | |
| Rated voltage AC UL | 300 V | |
| Rated voltage DC UL | 160 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 450 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 | 41.1 mm | |
| Product Length | 77.7 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 0.2132 kg | |
| Sell Pack Width | 42.9 mm | |
| Sell Pack Length | 42.9 mm | |
| Sell Pack Height | 81 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 0.2023 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen A3T450 used for?
The A3T450 provides fast-acting overcurrent protection for high-current industrial and commercial electrical distribution systems.
What is the current rating of the A3T450?
The fuse has a 450 A current rating.
What voltage is the A3T450 rated for?
The fuse is rated for 300 V AC and 160 V DC.
What type of fuse is the A3T450?
It is a Class T fast-acting blade fuse from the Mersen Amp-Trap® product range.
Where is the A3T450 typically installed?
It is commonly installed in switchboards, panelboards, load centres, metering equipment and industrial power distribution systems.
Trusted by Electrical Professionals Worldwide
Mersen Amp-Trap® Class T fuses are trusted worldwide for delivering dependable overcurrent protection, outstanding current limitation and long service life in demanding industrial and commercial electrical installations.
