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MERSEN FUSE H 1209P BCKUP 292-56/4 W1000105
Mersen W1000105 Limitor-P high voltage DIN transformer back-up fuse rated at 12 kV AC and 4 A, with a 63 kA breaking capacity and integrated 80 N striker.
£59.53
Why Choose the Mersen W1000105 High Voltage DIN Back-up Fuse?
The Mersen W1000105 is a dependable Limitor®-P high voltage DIN back-up fuse designed to protect transformers and associated medium voltage equipment against damaging short-circuit currents. Also identified by catalogue number 45DB120V4P, it is suitable for high voltage switchgear, controlgear and electrical distribution systems.
Manufactured in accordance with IEC 60282-1, the W1000105 provides reliable current limitation and fault interruption in demanding industrial and utility installations. Its pure silver fuse elements, silver-plated copper terminals and robust ceramic body support consistent electrical performance and long operational life.
With a rated voltage of 12 kV AC, a rated current of 4 A and an integrated 80 N striker, the Mersen W1000105 is suitable for transformer feeders and medium voltage protection assemblies. Its standard 56 mm diameter by 292 mm fuse-link size enables installation in compatible DIN fuse bases and switchgear systems.
Key Advantages
- Designed specifically for medium voltage transformer protection.
- 12 kV AC IEC rated voltage for high voltage distribution systems.
- 4 A rated current for compatible transformer circuits.
- 63 kA breaking capacity provides dependable fault interruption.
- Integrated 80 N striker supports indication and switchgear operation.
- Premium ceramic and silver construction provides reliable long-term performance.
Key Features
- Mersen Limitor®-P series.
- Catalogue number: 45DB120V4P.
- 12 kV AC IEC rated voltage.
- 4 A rated current.
- DIN high voltage back-up fuse for transformer protection.
- 80 N standard striker mechanism.
- Pure silver fuse elements with silver-plated copper terminals.
- VDE T4 design for medium voltage applications.
Reliable Protection for Medium Voltage Transformers
High voltage back-up fuses protect transformers, cables and switchgear by limiting and interrupting substantial short-circuit currents before they cause serious thermal or mechanical damage. The Mersen W1000105 is engineered to remain stable during normal transformer operation while responding effectively when a high-level electrical fault occurs.
The integrated striker provides a clear indication when the fuse has operated and can actuate a compatible switchgear mechanism. This supports coordinated circuit isolation, faster fault identification and safer maintenance within medium voltage power distribution systems.
Typical Applications
- Medium voltage distribution transformer protection.
- High voltage switchgear and controlgear.
- Electrical distribution substations.
- Ring main units and transformer feeders.
- Industrial medium voltage power systems.
- Utility and infrastructure distribution networks.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Device Type | Fuse link | |
| Fuse Type | High voltage | |
| Current | 4 A | |
| Voltage | 12000 V | |
| Manufacturer | Mersen | |
| Series | Limitor®-P Back-up Fuses | |
| Model | W1000105 | |
| Catalogue number | 45DB120V4P | |
| Product type | High voltage DIN transformer back-up fuse | |
| Rated voltage | 12 kV AC | |
| Rated current | 4 A | |
| Current type | AC | |
| Breaking capacity | 63 kA | |
| Minimum interrupting rating | 22 A | |
| Clearing I²t at rated voltage | 0.55 kA²s | |
| Power dissipation at rated current | 6 W | |
| Fuse size | 56 mm diameter × 292 mm | |
| Overall product length | 358 mm | |
| Mounting type | Clip mounting | |
| Terminal type | Cylindrical | |
| Terminal material | Silver-plated copper | |
| Body material | Ceramic | |
| Design | VDE T4 | |
| Indication system | 80 N striker | |
| Product weight | Approx. 1.7 kg | |
| Compliance | IEC 60282-1 and RoHS | |
| EAN | 3605340452785 | |
| HS Code | 85351000 |
Frequently Asked Questions
What is the Mersen W1000105 used for?
The W1000105 is a high voltage DIN back-up fuse designed to protect transformers and associated medium voltage equipment against damaging short-circuit currents.
What are the voltage and current ratings?
The fuse has a rated voltage of 12 kV AC and a rated current of 4 A.
What is the breaking capacity of the W1000105?
The Mersen W1000105 has a maximum AC breaking capacity of 63 kA.
Does the W1000105 include a striker?
Yes. It incorporates an integrated 80 N striker for fuse operation indication and compatible switchgear tripping functions.
What are the dimensions of this fuse?
The fuse has a body diameter of 56 mm, a fuse-link length of 292 mm and an overall product length of 358 mm.
Trusted for Medium Voltage Transformer Protection
Mersen Limitor® high voltage fuse-links are widely used by utilities, switchgear manufacturers and industrial engineers to provide dependable transformer protection and reliable short-circuit interruption.
