Overcurrent breaker S 304 4P C 40 A 6000 A DX3 series 407932

Reliable Protection for Electrical Installations – Legrand S 304 Circuit Breaker

This four-pole circuit breaker from the DX3 series, rated at 40A with characteristic C, is a critical component ensuring safety in any electrical installation. Designed for both residential and commercial applications, it effectively protects circuits against overload and short-circuit conditions. The C characteristic allows for temporary current surges, making it especially suitable for devices with induction motors or other loads with high inrush currents.

This breaker features a high breaking capacity—up to 10kA at 400V (compliant with IEC 60947-2) and 6kA at 400V (compliant with EN 60898)—ensuring reliable operation even under demanding conditions. DIN rail mounting is quick and intuitive, while its compact dimensions (4 modules wide) enable optimal space utilization in distribution boards.

Functionality and User Convenience

The DX³ series offers not only safety but also enhanced usability for installers:

• Integrated, retractable isolation inserts: Enable safe and convenient disconnection from the DIN rail during maintenance or replacement.
• Additional spring-loaded terminals: Allow connection of control and signaling wires without tools.
• Contact position indicators: Provide clear visual confirmation of the breaker’s state (ON/OFF) without opening the device.
• Lockable lever option: Special holes permit securing the breaker against accidental re-energizing using Colring cable ties.

The S 304 breaker is designed to operate in ambient temperatures ranging from -25°C to 70°C, making it ideal for harsh environmental conditions. It supports conductor cross-sections from 1.5 mm² to 35 mm² (single-core) and 1.5 mm² to 25 mm² (multi-core), ensuring compatibility with diverse installation types. The IP20 protection rating safeguards against finger contact.

Legrand DX³ circuit breakers meet rigorous safety and quality standards, as confirmed by multiple certifications and conformity declarations. Choosing this product guarantees reliable protection for electrical installations and peace of mind for end users.