Circuit breaker S 303 3P D 50A 6000A TX3 403760

Overcurrent circuit breakers S 300 series – reliable installation protection

Overcurrent circuit breakers of the S 300 series are a proven choice for ensuring electrical safety in residential and commercial buildings. Model S 303, a three-pole breaker with a rated current of 50A and D characteristic, effectively protects circuits against the effects of overloads and short circuits. The breaking capacity of 6kA (at 400V) guarantees a quick response in emergency situations, minimizing the risk of damage and fires.

This specific model, with catalog number 403760, stands out with its compact dimensions – the width occupies only 3 modules of the TH35 busbar, which facilitates installation even in crowded distribution boards. The installation depth of 44 mm allows for installation in various types of enclosures. Made of high-quality materials, the breaker ensures long-lasting and trouble-free operation.

Features and application

The S 303 breaker with D characteristic is particularly recommended for protecting circuits with receivers with high inrush current, such as electric motors, pumps or heating devices. The D characteristic allows for momentary exceeding of the rated current without unnecessary tripping, which is crucial for the correct operation of these devices. The use of a rated voltage of 400V AC and an insulation voltage of 500V ensures compatibility with most electrical installations.

• Flush mounting: Allows for aesthetic integration of the breaker into the wall or other structural elements.
• Three-pole design: Provides comprehensive protection of the entire circuit.
• D characteristic: Ideal for protecting devices with high inrush current.
• Breaking capacity 6kA/10kA: Quick response in the event of a short circuit, minimizing the risk of damage.
• Expandability: Compatibility with additional equipment (auxiliary contacts, releases) allows you to adapt the functionality to individual needs.
• Protection degree IP20: Protection against touching with a finger and solid objects with a diameter greater than 12.5 mm.

Construction and user parameters

The S 303 TX³ breaker is characterized by a solid construction and a well-thought-out design. The lower latch and terminal covers facilitate installation and connection of wires, saving installers time. Made of high-quality materials, it guarantees durability and resistance to environmental conditions. Operation in the frequency range of 50-60 Hz ensures versatility in various power systems. The rated impulse withstand voltage of 4 kV increases resistance to transient overvoltages. Pollution degree 2 indicates the possibility of operation in environments with a moderate level of contamination.