Fuse cutout with striker VVT-D3 12kV/20A 004232009

Reliable medium voltage protection

VVT-D3 12kV/20A fuse link is an element designed to protect medium voltage (MV) electrical and power equipment against the effects of overloads and short circuits. It is suitable for protecting cables, transformers, motors, and capacitor banks. The design with a thermal trigger provides additional protection against uncontrolled temperature increases, which is particularly important in specific applications.

Characteristics and application

VV series fuse links, and especially the VVT-D3 model, are characterized by high reliability and the ability to switch off short-circuit currents of up to 63 kA. Equipped with a thermal trigger, they activate the circuit breaker with a force of 80N when the body of the fuse link reaches a temperature of approximately 120°C – regardless of the source of heat. This solution minimizes the risk of damage caused by prolonged overload. Therefore, they are recommended for use in switchgear with SF6 gas.

Advantages and benefits

• High short-circuit breaking capacity: 63 kA guarantees effective protection of the installation even in the event of serious failures.
• Thermal trigger: Provides additional protection against overheating and damage to installation elements. It operates independently of the cause of temperature increase.
• Reliable construction: High-strength ceramic tube and galvanically protected contacts ensure long-lasting and trouble-free operation.
• Easy replacement: Improved contact cap facilitates and speeds up the replacement of the fuse link during maintenance or repair.
• Silver fuse element: Ensures optimal conductivity and reliable operation under rated conditions.
• Sealed construction: Protects against moisture, which increases the service life and stability of operating parameters.
• KEMA Labs test reports: Confirm compliance with standards and high product quality.

It is important to remember the minimum breaking current of 70A – below this value, the fuse link may not operate correctly in the event of an overload. The cold resistance is 44 mΩ, and the power loss is 21 W at the rated current. The minimum I²t pre-arc integral is 450 A²s, and the maximum I²t max is 7000 A²s. The fuse link has a diameter of 53 mm and a length of 292 mm, and its weight is 1.6 kg.