Fuse link with striker VVC3 24kV/31,5A 004250011

Medium voltage fuse links – reliable installation protection

VV fuse links are a proven protection element in medium voltage networks. Designed to protect electrical and power equipment MV – lines, cables, transformers, motors or capacitor banks – against the effects of short circuits and overloads. The construction of the fuse links provides both thermal and dynamic protection, and in the VVT-D3 versions additionally protects against uncontrolled temperature increases thanks to a built-in thermal trigger.

Construction and application

VV fuse links are characterized by a solid construction, using a high-strength ceramic tube and contacts protected galvanically and coated with nickel. The fusing element is made of silver, which guarantees reliable operation. The striker, depending on the model (VVC3 or VVT-D3), has a force of 50 N or 80 N and signals the operation of the fuse link, enabling the activation of the tripping mechanism of fuse disconnectors. The VVT-D3 version with a thermal trigger activates the striker when the fuse link body reaches a temperature of approximately 120°C, regardless of the cause of overheating.

Key features and benefits

• High short-circuit breaking capacity: up to 63 kA – ensures effective protection of the installation even with high short-circuit currents.
• Available with thermal trigger (VVT-D3): additional protection against overheating, especially important in SF6 switchgear.
• Reliable sealing system: protects against moisture and corrosion, ensuring long-term stability of parameters.
• Easy replacement: improved contact cap facilitates and speeds up the replacement process.
• Wide range of rated voltages: available models for 7.2 kV and 17.5 kV allow adaptation to different network configurations.
• KEMA Labs test reports: confirm compliance with standards and high product quality.

It is important to select the appropriate fuse link for a specific application, taking into account the rated current (31.5 A in this case) and the rated voltage (10/24 kV). The minimum breaking current I₃ is 3 A, which means that the fuse link may not operate correctly below this value. The cold resistance is 52 mΩ and the power loss Pn is 75 W. The pre-arcing integral I₂t min is 1400 A²s and the maximum breaking integral I₂t max is 15000 A²s.