Why Choose the Mersen A1000293 High-Voltage Transformer Fuse?
The Mersen A1000293, catalogue number 45DB360V50PTD, is a premium DIN high-voltage back-up fuse designed for the protection of distribution transformers in medium and high-voltage electrical systems. Part of the advanced Mersen Limitor®-PTD series, it incorporates Controlled Power Dissipation (CPD) technology and an integrated thermal striker for enhanced operational safety and equipment protection.
Designed for use in conjunction with air-insulated and gas-insulated switchgear, the A1000293 combines exceptional current-limiting performance with low switching voltage and excellent thermal characteristics. Manufactured using pure silver fuse elements, silver-plated copper terminals and a durable ceramic body, it provides dependable long-term protection in demanding utility and industrial applications.
With a rated voltage of 36 kV AC, a rated current of 50 A and a maximum breaking capacity of 20 kA, this fuse is ideally suited to protecting distribution transformers while minimising thermal and mechanical stresses during fault conditions. The integrated 80 N thermal striker can actuate compatible switchgear mechanisms for additional system protection.
Key Advantages
- Designed specifically for high-voltage transformer protection.
- 36 kV AC IEC rated voltage.
- 50 A rated current.
- 20 kA breaking capacity.
- Controlled Power Dissipation (CPD) technology.
- Integrated 80 N thermal striker.
- Suitable for air-insulated and gas-insulated switchgear.
- High current limitation helps minimise transformer damage during faults.
Key Features
- Mersen Limitor®-PTD transformer back-up fuse.
- Manufacturer part number: A1000293.
- Catalogue number: 45DB360V50PTD.
- Rated voltage: 36 kV AC.
- Rated current: 50 A.
- Maximum breaking capacity: 20 kA.
- Minimum interrupting current: 220 A.
- Fuse dimensions: 88 × 537 mm.
- Thermal striker: 80 N.
- Clip-mounted cylindrical terminals.
The Mersen A1000293 is engineered to interrupt severe short-circuit currents before they can damage distribution transformers or associated switchgear. Its current-limiting characteristics reduce both the peak fault current and the total energy released into the protected installation, helping extend equipment life and improve system reliability.
The integrated CPD thermal striker enhances operational safety by providing mechanical indication and actuating compatible switchgear where required. This makes the fuse particularly suitable for compact substations and modern gas-insulated switchgear installations.
Typical Applications
- Medium and high-voltage distribution transformers.
- Gas-insulated switchgear (GIS).
- Air-insulated switchgear.
- Compact transformer substations.
- Industrial electrical distribution.
- Utility transmission and distribution networks.
- High-voltage commercial installations.
