SZ203-B10 overcurrent circuit breaker, 3P, B characteristic, 10A, 6kA, AC 2CDS253025R0105

Overcurrent circuit breaker – reliable protection for electrical installations

This three-pole overcurrent circuit breaker from ABB's Standard series (model SZ203-B10) is a key element of protection in every electrical installation. It provides effective protection against the effects of overloads and short circuits, minimizing the risk of damage to equipment and fires. Characteristic B makes it particularly suitable for circuits with devices with high inrush current, such as motors or transformers. It reacts quickly to short circuits, while tolerating short-term current surges during device start-up.

This circuit breaker is characterized by a high short-circuit breaking capacity of 6kA at both 400V and 230V, which guarantees its reliable operation even in difficult conditions. Mounting on a DIN rail with a width of 3 modules is simple and quick, which translates into time savings during installation. The rated insulation voltage Ui is 440V, and the impulse withstand voltage Uimp is 4kV, which provides an additional level of safety.

Construction and application

The SZ203-B10 circuit breaker has been designed for a wide range of applications – from home installations to commercial and industrial facilities. Its compact dimensions (installation depth 69 mm) allow it to be mounted in switchboards with limited space. The cross-section of the connected single-wire conductor is 0.75 - 35 mm², and the multi-wire conductor is 0.75 - 25 mm², which provides great flexibility when selecting conductors. The device operates in the frequency range of 50-60 Hz and is adapted to work in an ambient temperature from -25°C to +55°C. The degree of protection IP20 provides protection against accidental contact.

Advantages and benefits

• High reliability: Short-circuit breaking capacity of 6kA guarantees effective disconnection of the circuit in the event of a failure.
• Versatility: Characteristic B makes the circuit breaker suitable for various types of loads, including motors and transformers.
• Simple installation: Mounting on a DIN rail takes a minimum of time and does not require specialized tools.
• Safety: Rated insulation voltage Ui 440V and impulse withstand voltage Uimp 4kV provide a high level of protection against overvoltages.
• Wide range of applications: Possibility of use in home, commercial and industrial installations.
• Durability: Made of high-quality materials, which ensures a long service life of the device.
• Expandability: Compatible with additional accessories increasing the functionality of the protection system.
• Energy limitation class: Class 3 provides adequate protection against the effects of electric arc during a short circuit.

The SZ203-B10 circuit breaker is a solid and proven solution for every installer and end user looking for reliable protection of their electrical installation.