Why Choose the Mersen E1000274 High-Voltage Back-Up Fuse?
The Mersen E1000274, catalogue reference 45DB120V160PTD, is a high-voltage DIN back-up fuse designed to protect distribution transformers and medium-voltage electrical systems against the damaging thermal and dynamic effects of short-circuit currents. It forms part of the Mersen Limitor®-PTD series, which combines dependable transformer protection with controlled power dissipation.
Rated for operation at 12 kV AC with a nominal current of 160 A, this fuse-link is intended for use alongside air-insulated or gas-insulated switchgear. Its back-up operating characteristic provides effective high-current fault protection when correctly coordinated with suitable switchgear and additional overload protection.
The E1000274 incorporates a robust ceramic fuse body, pure silver fuse elements and silver-plated copper contacts for reliable electrical performance. An integrated 80 N thermal striker provides mechanical indication and can operate compatible switchgear mechanisms when the fuse responds to a fault or excessive temperature condition.
Key Advantages
- High-voltage DIN back-up fuse for transformer protection.
- 12 kV AC rated voltage for medium-voltage installations.
- 160 A rated current.
- Controlled power dissipation supports efficient switchgear operation.
- Integrated 80 N thermal striker for indication and switchgear tripping.
- High breaking capacity for dependable short-circuit protection.
- Durable ceramic body with high-quality silver and copper components.
- Suitable for air-insulated and gas-insulated switchgear systems.
Key Features
- Mersen Limitor®-PTD back-up fuse series.
- Manufacturer reference E1000274.
- Catalogue number 45DB120V160PTD.
- 12 kV AC IEC rated voltage.
- 160 A rated current.
- 63 kA maximum breaking capacity.
- 610 A minimum breaking current.
- Total clearing I²t of 670 kA²s at rated voltage.
- Power dissipation of approximately 175 W at rated current.
- Integrated striker indication system.
- Cylindrical silver-plated copper terminals.
- Compliant with relevant IEC and VDE high-voltage fuse requirements.
High-voltage back-up fuses protect transformers and switchgear by interrupting substantial short-circuit currents before they can cause severe thermal or mechanical damage. The Mersen E1000274 is designed to operate within a coordinated protection system and should be selected according to the transformer rating, prospective fault current and switchgear manufacturer recommendations.
The controlled power dissipation characteristics of the Limitor®-PTD range help reduce unnecessary heat generation inside compact switchgear assemblies. Its thermal striker can also initiate a three-phase switch-disconnection sequence, helping prevent continued operation when one fuse-link has responded to a fault.
Typical Applications
- Medium-voltage distribution transformer protection.
- Air-insulated switchgear installations.
- Gas-insulated switchgear installations.
- Industrial medium-voltage substations.
- Commercial and infrastructure power distribution systems.
- Transformer feeders and ring main units.
- Utility and renewable-energy distribution equipment.
- Medium-voltage motor and controlgear systems requiring back-up protection.
