Circuit breaker S 303 3P D 40A 6000A TX3 403759

Reliable protection of electrical installations – Legrand S 303 TX³ circuit breaker

This three-pole circuit breaker with D characteristic is a key element in protecting electrical installations from the effects of overloads and short circuits. Designed for both domestic and professional use, it ensures safety and continuity of power supply. The S 303 TX³ model is distinguished by its high quality of workmanship and ease of installation, which will be appreciated by both installers and end users.

Construction and application

The S 303 TX³ circuit breaker is designed for mounting on a TH35 rail. Its compact dimensions (installation depth 44 mm) allow for installation even in limited spaces. Made of high-quality materials, it ensures long-lasting and reliable operation. The rated current of 40A and D characteristic make it ideal for protecting circuits with receivers with high starting current – e.g. electric motors or heating devices. The rated short-circuit breaking capacity of 6 kA at 400 V and 10 kA at 230 V guarantees effective protection against serious failures.

Key features and benefits

• D characteristic: Provides delayed tripping during short-term overloads, which helps avoid unnecessary tripping of the circuit when starting devices with a motor or transformer.
• High short-circuit breaking capacity: 6 kA (400V) / 10 kA (230V) – effectively breaks the circuit in the event of a short circuit, minimizing the risk of damage to the installation and equipment.
• Mounting on TH35 rail: Enables quick and easy mounting in the switchgear cabinet.
• Three-pole design: Provides complete protection for three-phase electrical circuits.
• Protection degree IP20: Protection against contact with fingers, which increases safety.
• Compliance with standards: Meets the requirements of EN 60898-1 and EN 60947-2 standards, guaranteeing safety and reliability.
• Expandability: Compatible with additional auxiliary equipment, such as auxiliary contacts or undervoltage releases, allowing you to adapt the functionality to individual needs.
• Rated insulation voltage Ui: 500 V – ensures safe operation in various installation conditions.

S 300 TX³ series circuit breakers are a proven choice for anyone who values safety, reliability and ease of installation. Thanks to their versatility, they find application in a wide range of electrical installations – from single-family homes to commercial and industrial buildings.