Why Choose the Mersen G1000138 High-Voltage Back-Up Fuse?
The Mersen G1000138, catalogue reference 45DB240V4PT, is a high-voltage DIN back-up fuse-link developed for protecting distribution transformers against damaging short-circuit currents. As part of the Mersen Limitor®-PT series, it features controlled power dissipation (CPD), making it particularly suitable for enclosed medium-voltage switchgear where reduced operating temperatures are essential.
Rated at 24 kV AC and 4 A, the G1000138 is manufactured using a ceramic fuse body with pure silver fuse elements and silver-plated copper end caps to provide dependable long-term electrical performance. It complies with IEC 60282-1 and the VDE T4 specification for transformer protection fuse-links.
An integrated 80 N striker provides positive operation indication and can activate compatible switchgear trip mechanisms. The controlled power dissipation design helps minimise heat generation inside compact switchgear whilst maintaining excellent current-limiting performance during fault conditions.
Key Advantages
- High-voltage DIN back-up fuse for transformer protection.
- 24 kV AC rated voltage.
- 4 A rated current.
- Controlled power dissipation reduces switchgear heating.
- 63 kA breaking capacity.
- Integrated 80 N striker for indication and switchgear operation.
- Current-limiting design reduces thermal and mechanical fault stress.
- Ceramic construction with silver fuse elements for dependable performance.
Key Features
- Mersen Limitor®-PT series.
- Manufacturer item number G1000138.
- Catalogue number 45DB240V4PT.
- 24 kV AC IEC rated voltage.
- 4 A rated current.
- 63 kA maximum breaking capacity.
- 23 A minimum breaking current.
- Total clearing I²t of 0.6 kA²s.
- Power dissipation of approximately 10 W.
- Integrated 80 N striker with CPD technology.
- DIN clip-mounted construction.
- Designed in accordance with IEC 60282-1.
The Mersen G1000138 rapidly interrupts high fault currents before they can damage transformers and associated switchgear. Its controlled power dissipation technology reduces heat build-up during normal operation whilst maintaining excellent current-limiting performance during fault conditions.
As a back-up fuse-link, the G1000138 should be coordinated with suitable overload protection. Correct selection should consider transformer rating, prospective fault current and switchgear manufacturer recommendations to achieve optimum protection and system reliability.
Typical Applications
- Distribution transformer protection.
- Medium-voltage substations.
- Air-insulated switchgear.
- Gas-insulated switchgear.
- Industrial electrical distribution.
- Utility power networks.
- Renewable energy transformer installations.
- Medium-voltage feeder protection.
