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 H 2409UP BCKUP T442-56/20 45DB240V20PT
Mersen L1000142 Limitor PT DIN high voltage back-up fuse-link for transformer protection, rated 24 kV AC, 20 A with controlled power dissipation and 80 N striker.
£66.81
Why Choose the Mersen L1000142 High Voltage Transformer Fuse?
The Mersen L1000142 is a high performance Limitor®-PT DIN back-up fuse-link engineered to provide dependable short-circuit protection for medium voltage transformers. Designed in accordance with IEC 60282-1, this fuse forms part of Mersen's trusted Limitor®-PT range, offering controlled power dissipation and reliable protection for electrical distribution systems.
Manufactured using premium materials including pure silver fuse elements, silver-coated copper end caps and a robust ceramic body, the L1000142 delivers consistent performance in demanding utility, industrial and infrastructure applications. Its integrated thermal striker simplifies operation within switchgear and transformer protection systems.
With a 24 kV AC voltage rating, 20 A current rating and 56 mm diameter × 442 mm length construction, the Mersen L1000142 is ideally suited for protecting medium voltage distribution transformers against damaging short-circuit currents while maintaining dependable system reliability.
Key Advantages
- High voltage DIN back-up fuse-link for transformer protection.
- 24 kV AC IEC rated voltage.
- 20 A current rating.
- Designed in accordance with IEC 60282-1.
- Controlled power dissipation improves thermal performance.
- Integrated 80 N thermal striker for reliable operation.
- High quality ceramic construction with pure silver fuse elements.
- Suitable for medium voltage switchgear and transformer applications.
Key Features
- Manufacturer: Mersen.
- Series: Limitor®-PT Back-up Fuses.
- Catalogue number: 45DB240V20PT.
- Rated voltage: 24 kV AC.
- Rated current: 20 A.
- Fuse dimensions: Ø56 mm × 442 mm.
- Controlled power dissipation (CPD) design.
- 80 N striker mechanism for switchgear operation.
- Designed specifically for transformer short-circuit protection.
Reliable Protection for Medium Voltage Transformers
The Mersen Limitor®-PT range has been developed to protect distribution transformers from the damaging effects of high fault currents. As a back-up fuse, the L1000142 rapidly interrupts short-circuit faults while remaining coordinated with other protection devices within medium voltage electrical networks.
Its controlled power dissipation design helps maintain stable operating temperatures throughout its service life, while the integrated striker enables dependable mechanical tripping within compatible switchgear assemblies.
Typical Applications
- Medium voltage transformer protection.
- Electrical distribution substations.
- Industrial power distribution systems.
- Medium voltage switchgear.
- Utility infrastructure.
- Renewable energy distribution equipment.
- Commercial and industrial electrical installations.
Technical Specifications
Tick the specs you need, then view products that match.
| Voltage | 240 V | |
|---|---|---|
| Device Type | Fuse link | |
| Fuse Type | High voltage | |
| Current | 20 A | |
| Manufacturer | Mersen | |
| Series | Limitor®-PT Back-up Fuses | |
| Model | L1000142 | |
| Catalogue number | 45DB240V20PT | |
| Product type | High voltage DIN back-up fuse-link | |
| Application | Transformer protection | |
| Rated voltage | 24 kV AC | |
| Rated current | 20 A | |
| Standard | IEC 60282-1 | |
| Fuse diameter | 56 mm | |
| Fuse length | 442 mm | |
| Striker | Controlled power dissipation, 80 N | |
| Body material | Ceramic | |
| Fuse element | Pure silver | |
| End caps | Silver-coated copper | |
| Mounting | DIN high voltage fuse mounting | |
| EAN | 3605340453157 | |
| RoHS compliant | Yes | |
| HS Code | 85351000 |
Frequently Asked Questions
What is the Mersen L1000142 used for?
The Mersen L1000142 is a medium voltage DIN back-up fuse designed to protect transformers against high short-circuit currents.
What voltage is the L1000142 rated for?
The fuse has a rated operating voltage of 24 kV AC in accordance with IEC requirements.
What current rating does this fuse have?
The Mersen L1000142 has a 20 A current rating.
Does this fuse include a striker?
Yes. It incorporates an integrated 80 N thermal striker for use with compatible switchgear and protection systems.
Which standards does the fuse comply with?
The fuse is manufactured in accordance with IEC 60282-1 for high voltage back-up fuse-links.
Trusted by Electrical Utilities and Industry
Mersen Limitor®-PT high voltage fuse-links are trusted worldwide for dependable transformer protection, helping utilities, OEMs and industrial operators maintain reliable medium voltage electrical distribution systems.
