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 20A T FUSE A3T20
The Fuse A3T delivers rapid, reliable protection for critical circuits with a compact Class T footprint and fast-acting response. Rated at 200A, 300VAC, and 160VDC with blade terminations for easy installation.
£17.61
Why Choose the Mersen A3T20 Amp-Trap® Class T Fuse?
The Mersen A3T20 is a fast-acting Class T current-limiting fuse designed to provide reliable protection against short circuits and overcurrent conditions in industrial and commercial electrical systems. As part of the trusted Mersen Amp-Trap® A3T series, it combines exceptional current limitation with a compact physical size, making it ideal for modern electrical distribution equipment.
Manufactured with a durable glass melamine body, the A3T20 offers excellent dimensional stability and permanently blade-stamped catalogue identification for easy product recognition. Its unique Class T dimensions prevent substitution with lower-rated fuse classes, helping maintain system safety and compliance.
With a rated current of 20 A, a 300 V AC rating and a 160 V DC rating, the Mersen A3T20 is ideal for protecting panelboards, load centres, switchboards, circuit breakers, metering centres and industrial electrical distribution equipment where rapid fault interruption is essential.
Key Advantages
- Fast-acting Class T current-limiting fuse for dependable circuit protection.
- 20 A rated current for industrial and commercial electrical systems.
- 300 V AC and 160 V DC voltage ratings.
- Extremely current-limiting design reduces damaging peak fault currents.
- Compact dimensions maximise panel design flexibility.
- Unique Class T construction prevents substitution with lower-performance fuse types.
Key Features
- Mersen Amp-Trap® A3T series.
- UL Class T fuse.
- 20 A rated current.
- 300 V AC / 160 V DC rated voltage.
- Fast-acting current-limiting characteristic.
- Glass melamine body for superior dimensional stability.
- Permanent blade-stamped catalogue identification.
- Ferrule construction for compatible Class T fuse holders.
Reliable Current-Limiting Circuit Protection
Current-limiting fuses such as the Mersen A3T20 interrupt fault currents before they reach their maximum prospective value. This helps minimise thermal and mechanical stress on conductors, switchgear and connected electrical equipment, improving system reliability and reducing repair costs.
The Amp-Trap® A3T series is widely specified by electrical engineers and panel builders where compact dimensions, rapid fault clearance and high interrupting capacity are required in industrial and commercial installations.
Typical Applications
- Industrial panelboards.
- Load centres.
- Switchboards.
- Circuit breaker protection.
- Metering centres.
- Industrial machinery.
- Commercial electrical installations.
Technical Specifications
Tick the specs you need, then view products that match.
| Current | 20 A | |
|---|---|---|
| Voltage | 300 V | |
| Fuse Type | UL class | |
| Fuse Class | Fast acting | |
| Item number | A3T200 | |
| Description | Fuse A3T - Class T - Fast-Acting 300VAC 160VDC 200A Blade Amp-Trap® | |
| EAN/UPC Code | 782001890230 | |
| Rated voltage AC UL | 300 V | |
| Rated voltage DC UL | 160 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 200 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 | 26.9 mm | |
| Product Length | 62 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 0.0771 kg | |
| Sell Pack Width | 28.7 mm | |
| Sell Pack Length | 28.7 mm | |
| Sell Pack Height | 65 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 0.073 kg | |
| HS Code | 85361050 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen A3T20 used for?
The Mersen A3T20 protects industrial and commercial electrical circuits against damaging short circuits and overcurrent conditions.
What is the current rating of the Mersen A3T20?
The fuse has a rated current of 20 A.
What voltage is the A3T20 rated for?
The Mersen A3T20 is rated for electrical systems operating at up to 300 V AC and 160 V DC.
Is the Mersen A3T20 a fast-acting fuse?
Yes. The A3T20 is a fast-acting, current-limiting Class T fuse designed to interrupt high fault currents rapidly.
Where is the Mersen A3T20 typically installed?
It is commonly installed in compatible Class T fuse holders within panelboards, switchboards, metering centres and industrial electrical distribution systems.
Trusted by Electrical Professionals Worldwide
Mersen Amp-Trap® Class T fuses are trusted by engineers, panel builders and equipment manufacturers worldwide for delivering compact, reliable and high-performance protection in critical electrical distribution systems.
