Circuit breaker S 303 3P D 20A 6000A TX3 403756

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. The S 303 TX³ model from Legrand, with a rated current of 20A, provides effective protection in both domestic and industrial installations. Its compact dimensions and flush mounting allow for discreet integration with existing infrastructure.

Design and functionality

The S 303 TX³ circuit breaker has been designed for ease of installation and operation. The bottom latch and terminal covers facilitate cable routing and ensure a secure connection. The device is compatible with a wide range of auxiliary equipment, such as auxiliary and signaling contacts, which expands its functionality and allows it to be adapted to individual needs. Made of high-quality materials, it guarantees long-lasting and reliable operation.

• D characteristic: provides a delayed response to short-term current surges, which is particularly important when protecting circuits with devices with high inrush current (e.g., motors). This minimizes the risk of unnecessary tripping during normal operation.
• Short-circuit capacity: 6 kA at 400 V and 10 kA at 230 V – ensures effective disconnection of the circuit in the event of a short circuit, protecting the installation from damage.
• Flush mounting: allows for aesthetic integration of the circuit breaker into the wall or other surfaces, maintaining a neat appearance of the installation.
• Width of 3 modules: compact dimensions allow for efficient use of space in the distribution board.
• Protection class IP20: provides protection against finger contact and protects against the ingress of solid objects larger than 12.5 mm.
• Rated voltage 400 V: allows use in standard electrical installations.

Applications and compliance with standards

The S 303 TX³ circuit breaker is used in a variety of electrical installations, such as:

• Lighting circuits
• Socket circuits
• Circuits powering electrical devices with high inrush current (e.g., motors)
• Industrial installations
• Residential and commercial buildings

The device meets the requirements of EN 60898-1 and EN 60947-2 standards, which guarantees its safety and reliability. The rated impulse withstand voltage Uimp is as high as 4 kV, which further increases resistance to overvoltages. A wide frequency range (50-60 Hz) allows use in various power systems.