Overcurrent circuit breaker S 312 2P B 4 A 10000 A series TX3 404108

The S 312 2P B 4 A circuit breaker is a member of the Legrand TX³ series, designed to protect electrical installations against the effects of overloads and short circuits. This two-pole circuit breaker with characteristic B is ideal for lighting and socket circuits, where protection against brief current surges is essential.

Protection and Reliability

The breaker’s construction is based on robust materials and complies with standards EN 60898-1, VDE 0641-11, and EN 60947-2. Its rated short-circuit breaking capacity of 10 kA at 400 V and 16 kA at 230 V ensures effective protection of the installation in the event of a fault. The B characteristic provides rapid response to overloads while allowing for brief peak loads—particularly important for devices with induction motors or transformers. The rated insulation voltage Ui is 500 V, and the rated impulse withstand voltage Uimp is 4 kV—these parameters ensure safety and long-term durability.

Installation and Functionality

The S 312 TX³ breaker is mounted on a DIN rail (EN 60715) and occupies a width of two modules (35 mm). Covered terminals and a bottom clip facilitate quick and convenient installation and wiring. Additionally, the breaker supports the installation of auxiliary devices—such as auxiliary and signaling contacts, undervoltage releases, or remote actuators—extending its functionality and enabling customization to meet specific installation requirements. An integrated labeling window simplifies identification of the breaker’s function within the installation. The IP20 protection rating ensures protection against finger contact.

Key Features

• Short-circuit breaking capacity: up to 16 kA (at 230 V), ensuring effective protection against short-circuit consequences.
• Characteristic B: ideal for protecting lighting and socket circuits, resistant to brief current surges.
• DIN rail mounting: fast and easy installation in distribution boards.
• Expandability: compatible with various auxiliary devices to enhance functionality.
• Safety: compliance with European standards (EN 60898-1, VDE 0641-11, EN 60947-2) guarantees high user safety.
• Rated current: 4 A—suitable for typical lighting and socket circuits with low load demands.