Fuse cut-out with striker VVT-D3 24kV/40A 004252013

Reliable medium voltage protection

The VVT-D3 24kV/40A 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 an 80N striker not only provides effective protection, but also visual indication of operation.

Construction and operating principle

Fuse links from the VV series, and in particular the VVT-D3 model, are characterized by the presence of a thermal trigger. This solution allows reaction not only to sudden current surges, but also to the gradual increase in temperature inside the fuse link. The trigger activates the striker (80N force) when the housing temperature reaches approximately 120°C – regardless of the heat source. This design is particularly recommended for use in switchgear with SF6 gas. Additionally, the fuse link has a reliable sealing system protecting against moisture and a high-strength ceramic tube. Galvanically protected contacts made of electrolytic copper coated with nickel ensure a durable connection and minimize the risk of corrosion.

Key parameters and features

• Breaking capacity: 63 kA – guarantees effective circuit interruption in the event of a high-current short circuit.
• Rated current: 40A – matched to protect installations with a specific load.
• Rated voltage: 10/24 kV – enables use in a wide range of medium voltage installations.
• Thermal trigger: Provides an additional layer of protection against thermal overloads.
• Striker: Enables quick visual identification of fuse link operation.
• Cold resistance: 38 mΩ – an important parameter when selecting the appropriate fuse link for a specific application.
• Minimum I²t pre-arcing integral: 3200 A²s - parameter important for selectivity coordination with other protective devices.
• Maximum I²t let-through integral: 27000 A²s - parameter important for selectivity coordination with other protective devices.
• Diameter: 53 mm, Length: 442 mm - dimensions facilitating the selection of the appropriate fuse base and mounting.
• Weight: 2.3 kg - facilitates transport and installation.

It is worth remembering that the VV series of fuse links with lower minimum breaking currents is also available, allowing for even more precise selection of protection for specific needs. Fuse bases with an operation indicator (microswitch) are also available.