SZ201-B20 overcurrent circuit breaker, 1P, B characteristic, 20A, 6kA, AC 2CDS251025R0205

Overcurrent circuit breaker from the S201-B20 series is a reliable protection for electrical installations against overloads and short circuits. Designed for operation in alternating current (AC) circuits, it offers effective protection for both installers and end-users. This single-pole circuit breaker with a rated current of 20A and a short-circuit interrupting capacity of 6kA is a solid element of the pro M compact system from ABB.

Characteristics and application

The circuit breaker is characterized by a B characteristic, which means it reacts quickly to an increase in short-circuit current, but is more tolerant to short-term inrush currents – which is particularly important when connecting devices with motors or other inductive loads. This minimizes the risk of unnecessary tripping of the circuit during normal operation. Mounting on a DIN rail with a width of 1 module provides convenience and space saving in the switchgear cabinet.

Construction and parameters

The design of the circuit breaker is designed with safety and durability in mind. The rated insulation voltage Ui is 440V, and the impulse withstand voltage Uimp is 4kV. The housing with a degree of protection IP20 provides basic protection against touch and ingress of solid objects. The circuit breaker is adapted to operate at temperatures from -25°C to 55°C, which allows it to be used in various environmental conditions. The possibility of connecting wires with a cross-section from 0.75 mm² to 35 mm² (solid) or from 0.75 mm² to 25 mm² (stranded) provides flexibility when selecting appropriate power cables. The energy limitation class is 3, and the surge category is III – which indicates its ability to withstand short-term overvoltages in the electrical installation. The pollution degree is 2, which means that the device is intended for environments with a moderate level of pollution.