Disconnect switch 4P/400A SZ400.4

Fuse disconnect switch – reliable installation protection

This four-pole fuse disconnect switch with a rated current of 400A is a key element of every electrical installation where high reliability and safety are required. Designed to work with NH2 fuse links, it provides effective protection against overloads and short circuits. The design allowing disconnection of all current paths increases functionality and safety during maintenance or repair.

Construction and application

The SZ400.4 disconnect switch is widely used in low-voltage switchgear, transformer stations, and industrial installations and public buildings. Its solid construction, made of durable materials – galvanized steel or stainless steel – guarantees long-lasting and trouble-free operation even in harsh environmental conditions. The housing made of frost and UV resistant plastic further increases its durability. Cable connection is made using cable lugs, ensuring a secure and stable connection.

Key features and benefits

• High breaking capacity: up to 2400A, allowing for safe disconnection of the load in the event of a failure.
• Versatility: possibility of installing fuse links with different rated currents (max. 250A for size 1 fuse and 400A for size 2 fuse).
• Safety: full disconnection of all current paths during maintenance or repair.
• Durability: insulating elements made of resistant plastic, and steel protected against corrosion.
• Compliance with standards: meets the requirements of EN 60947-3:2013 and IEC 60947-3, guaranteeing safety and reliability.
• Connection flexibility: included KG43.6 connectors allow connection of aluminum or copper conductors with a cross-section of 50-240 mm².
• Functionality: can be used as a main disconnect switch and a safety disconnect switch.
• Easy installation: designed for direct mounting, without the need for additional supports or mounting plates (although compatible with PEK43 or PEK49).

Thanks to this solution, both installers and end users can count on the reliable and safe operation of the electrical installation for a long time. The manufacturer's warranty is 2 years.