Fuse link with striker VVT-D3 24kV/16A 004252008

Medium voltage fuse links – reliable installation protection

VV fuse links are a proven solution for protecting electrical and power equipment at medium voltage (MV). Designed to protect cables, transformers, motors and capacitor banks from the effects of short circuits and overloads. In particular, VVT-D3 fuse links, thanks to the use of a thermal trigger, also protect against uncontrolled temperature increases.

Construction and operating principle

VVT-D3 fuse links are equipped with a thermal trigger, which activates the striker with a force of 80N when the fuse body reaches a temperature of approximately 120°C – regardless of the cause of the temperature increase. This is an important solution in the case of SF6 gas switchgear, where traditional protection methods may be less effective. The striker signals the operation of the fuse link and enables the activation of the fuse-disconnecting mechanism. The construction of the fuse links is characterized by high reliability thanks to the use of a high-strength ceramic tube and contacts protected galvanically, made of electrolytic copper coated with nickel.

Key parameters and application

The VVT-D3 24kV/16A fuse link is characterized by a rated current of 16A and a rated voltage of 24kV (at a frequency of 50/60Hz). The rated breaking capacity is as high as 63kA, which ensures effective protection even in the event of serious short circuits. The cold resistance is 125 mΩ, and the power loss is 42W. The minimum pre-arcing integral I²t is 320 A²s, and the maximum breaking integral I²t is 5200 A²s. These values testify to the high dynamic and thermal parameters of the fuse link.

• Application: Ideal for protecting medium voltage circuits in transformer stations, MV switchgear and industrial installations.
• Thermal trigger: Provides additional protection against thermal overloads, which is particularly important in temperature-sensitive applications.
• High breaking capacity: Guarantees safe disconnection of the circuit in the event of a short circuit with a high current.
• Reliability: Thanks to the solid construction and high-quality materials, VV fuse links are characterized by a long service life and minimal risk of failure.
• Easy replacement: Improved contact cap facilitates and speeds up the process of replacing fuse links during maintenance or repair of the installation.