Overcurrent breaker S 304 4P B 40 A 6000 A DX3 series 407628

Reliable protection for electrical installations – DX³ series overcurrent breaker

This four-pole S 304 overcurrent breaker with a rated current of 40 A and characteristic B is a critical component of every safe and efficient electrical installation. Designed with both professional installers and end users in mind, it provides effective protection against overloads and short circuits, minimizing the risk of failures and fires. Manufactured by the renowned company Legrand, it guarantees high quality and reliable operation.

Functionality and safety in one

This breaker features a high short-circuit breaking capacity—up to 6 kA at 400 V (compliant with EN 60898) and 10 kA at 400 V (compliant with IEC 60947-2). This ensures rapid response to sudden current surges, protecting sensitive equipment and electrical infrastructure. The B characteristic means the breaker reacts quickly to brief overloads while remaining tolerant to temporary current spikes during motor startup—particularly important for residential and commercial applications. Additionally, simultaneous disconnection of the N conductor enhances user safety.

Easy installation and user comfort

The S 304 overcurrent breaker from the DX³ series is designed for simple installation and convenient operation. With a width of 4 modules, it enables efficient use of space in distribution boards. The option for flush mounting and additional accessories increases its versatility. It supports single-core cable cross-sections from 1.5 to 35 mm² and multi-core cables from 1.5 to 25 mm², ensuring compatibility with various installation types. The wide operating temperature range (-25 to 70°C) allows use in diverse environmental conditions. Constructed from high-quality materials, it offers durability and resistance to mechanical damage (protection rating IP20).