Why Choose the Mersen Z1000154 High-Voltage Transformer Fuse?
The Mersen Z1000154, catalogue reference 45DG120V25P, is a dependable DIN high-voltage general-purpose fuse-link designed for the protection of power transformers in medium-voltage switchgear and electrical distribution systems. As part of the Mersen Limitor®-G series, it provides effective protection against short-circuit currents and low overcurrents.
Rated at 12 kV AC and 25 A, the Z1000154 combines rapid fault interruption with high current-limiting performance. Its 40 kA breaking capacity helps minimise the thermal and mechanical stress placed on transformers, cables and associated switchgear during electrical faults.
The fuse-link features a robust ceramic body, pure silver fuse elements and silver-plated copper end caps. An integrated 80 N striker provides mechanical indication when the fuse operates and can be used with compatible switchgear tripping or interlocking mechanisms.
Key Advantages
- General-purpose high-voltage fuse-link for transformer protection.
- 12 kV AC voltage rating for medium-voltage installations.
- 25 A rated current for appropriately sized transformer circuits.
- High 40 kA breaking capacity for reliable fault interruption.
- Current-limiting operation reduces peak fault currents.
- Integrated 80 N striker for indication and switchgear operation.
- Low power dissipation supports efficient system performance.
- Manufactured in accordance with IEC 60282-1.
Key Features
- Mersen Limitor®-G general-purpose fuse series.
- 12 kV AC IEC rated voltage.
- 25 A ampere rating.
- 40 kA maximum breaking capacity.
- 36 kA²s clearing I²t at rated voltage.
- 15 W power dissipation at rated current.
- Mechanical striker indication system.
- Pure silver fuse elements for consistent performance.
- Silver-plated copper end caps.
- Ceramic body for high dielectric and thermal strength.
High-voltage general-purpose fuse-links protect transformers by interrupting both high short-circuit currents and lower overcurrents. The Mersen Z1000154 limits the magnitude and duration of fault current, reducing the risk of severe damage to transformer windings, switchgear and connected distribution equipment.
The Limitor®-G design offers high breaking capacity, rapid operation and low switching voltage. Correct selection should take account of transformer rating, operating voltage, magnetising inrush current and coordination with upstream and downstream protection devices.
Typical Applications
- Medium-voltage transformer protection.
- High-voltage switchgear and controlgear.
- Transformer feeder panels.
- Industrial electrical distribution systems.
- Utility substations and power networks.
- Ring main units and compact substations.
