Overcurrent breaker S 301N 1P+N C 20 6000 A DX3 series 407743

The Legrand S 301N circuit breaker is a member of the DX3 series, designed to protect electrical installations against overloads and short circuits. It is a single-pole device with neutral switching (1P+N), engineered for operation in networks with a voltage of 230V and frequency of 50/60 Hz. The rated breaking current is 20A, making it suitable for protecting circuits with medium power consumption.

Characteristics and Application

The S 301N breaker features a C characteristic, indicating delayed response to transient current surges. This makes it ideal for circuits with inductive or capacitive loads such as motors, transformers, or switch-mode power supplies—devices that generate inrush currents during startup. The short-circuit breaking capacity of 6kA (at 230V) and 10kA (per IEC 60947-2) ensures effective protection in the event of severe network disturbances. Mounting on a DIN rail and compatibility with TH35 rails simplify installation and integration into existing electrical infrastructure.

Construction and Specifications

The breaker is constructed from high-quality thermoplastic material, ensuring durability and resistance to mechanical damage. Its compact dimensions (1 module width, 44 mm depth) allow efficient use of space in distribution boards. The device has an IP20 protection rating, providing protection against finger contact and ingress of solid objects larger than 12.5 mm. Conductors with cross-sections from 0.75 mm² to 16 mm² (single-core) or 0.75 mm² to 10 mm² (multi-core) can be connected without additional tools. The wide operating temperature range (-25°C to +70°C) enables use in diverse environmental conditions. Additionally, the simultaneous disconnection of the neutral pole enhances operational safety.