Overcurrent circuit breaker, 3P+N, C characteristic, 50A, 6kA, AC | S203-C50NA 2CDS253103R0504

Overcurrent switch for reliable installation protection

This three-pole overcurrent switch with a neutral pole, C characteristic and a rated current of 50A, is a key element in protecting electrical installations. It provides effective protection against overloads and short circuits, guaranteeing safety and minimizing the risk of failure. It is a device designed for mounting on a DIN rail, ideal for both professional installers and end-users looking for a reliable solution.

Functionality and application

The S203-C50NA switch from the S200 series by ABB has been designed to operate within a wide range of voltages (400V) and frequencies (50-60Hz). The C characteristic makes it ideal for circuits with high starting current – it reacts more slowly to short current surges, therefore tolerates the starting of devices with a motor well. The rated short-circuit breaking capacity of 6kA at 400V ensures effective protection in the event of a failure. The device is used in domestic, commercial and industrial installations where high reliability and safety are required.

• Versatile application: ideal for protecting lighting circuits, socket circuits and electrical devices with high power consumption.
• Overload protection: the thermal mechanism protects against prolonged exceeding of the permissible current, preventing overheating of wires and damage to devices.
• Short-circuit protection: the magnetic mechanism reacts immediately to a sudden increase in current, disconnecting the circuit and minimizing the risk of fire or equipment damage.
• Neutral pole: the presence of a neutral pole enables full circuit protection, including against insulation faults.
• DIN rail mounting: standard mounting simplifies installation and replacement of the switch in existing distribution boards.

Construction and parameters

The switch is characterized by a compact design (width of 4 modules) and solid construction. The housing made of high-quality thermoplastic provides durability and resistance to mechanical damage. The rated impulse withstand voltage of 4kV guarantees resistance to overvoltages. The cross-section of the connectable single-wire conductor is from 0.75 mm² to 35 mm², and the multi-wire conductor from 0.75 mm² to 25 mm², which provides flexibility in selecting wires tailored to specific installation needs. The device has a protection degree of IP20, which means protection against touching with a finger and solid objects with a diameter of more than 12.5 mm. Power losses are 13W during operation of the device.