NH1 fuse disconnect switch 3P 250A 690VAC busbars 60 mm supply/discharge screw M10 LT153

Fuse disconnect switch – reliable installation protection

This three-pole NH1 fuse disconnect switch, with a rated current of 250A and a voltage of 690VAC, is a key element of any electrical installation. Designed to work with 60mm busbars and equipped with M10 screw terminals, it provides safe and efficient circuit disconnection. It is a solid solution for both professional installers and end-users who value reliability and safety.

Design and application

The disconnect switch is designed for mounting on a busbar system, offering flexibility in installation configuration. Its compact dimensions (width 184mm, depth 110mm) allow for easy integration even in limited spaces. It uses NH1 type fuse links, providing effective protection against overloads and short circuits. M10 screw terminals allow connection of cables with a cross-section from 6 to 150 mm², both rigid and flexible. The device design allows for vertical mounting.

Key features and benefits

• High resistance to environmental conditions: The housing with an IP3X protection degree protects against the ingress of solid objects larger than 2.5 mm, ensuring reliable operation even in difficult conditions.
• Safety of use: The rated insulation voltage Ui is 1000V, and the impulse withstand voltage Uimp is 8000V – a guarantee of a high level of safety.
• Durable construction: Mechanical endurance of 1400 cycles and electrical endurance of 200 cycles confirm the high quality of workmanship and long service life. The total service life (mechanical and electrical) is as much as 1600 cycles according to IEC 60947-3 Table 4.
• Versatility: The ability to use with different cable cross-sections (6-150 mm²) makes the disconnect switch compatible with a wide range of installations.
• Easy installation: Mounting on a busbar system and M10 screw terminals facilitate and speed up the installation process. Tightening torque is 12-12Nm.
• Wide operating temperature range: The device retains its properties in the temperature range from -25°C to +55°C.
• Low power loss: Total power loss at rated current is only 20W, which translates to energy savings.

This disconnect switch is used in electrical switchboards, control cabinets and other installations requiring reliable disconnection of power circuits. It is ideal for both commercial and industrial buildings.