SZ201-B40 overcurrent circuit breaker, 1P, B characteristic, 40A, 6kA, AC 2CDS251025R0405

Overcurrent switch for reliable installation protection

The ABB SZ201-B40 overcurrent switch is a compact and robust device designed to protect single-phase electrical installations. It provides effective protection against the effects of overloads and short circuits, which translates to safe use and longer life of connected devices. This model, with a rated current of 40A, is perfect for both home and office installations, as well as light industrial applications.

Construction and mounting

The switch is designed for easy mounting on a standard DIN TH35 rail (35 x 15 mm and 35 x 7.5 mm) in any position. Compact dimensions – only 1 module wide (17.5 mm) – allow for optimal use of space in the distribution box. Two-way screw terminals provide a secure and durable connection of wires with a cross-section from 0.75 mm² to 35 mm² (solid) or 0.75 mm² to 25 mm² (stranded). The toggle lever with a clear contact position indicator (ON/OFF) makes operation and device status control easier.

Characteristics and operating parameters

The B tripping characteristic means that the switch reacts quickly to short circuits, while tolerating short-term current surges during the start-up of motors or other loads with high inrush current. The rated short-circuit breaking capacity of 6kA (at 230V and 400V) guarantees reliable circuit disconnection in the event of a failure. The device operates at a rated voltage of 230V and a frequency of 50-60 Hz, and its resistance to ambient temperature in the range of -25°C to +55°C enables operation in various environmental conditions. The energy limitation class is 3, and the surge category is III – confirming its high quality and compliance with safety standards.

Application and benefits

• Protection against overloads and short circuits: protects the electrical installation and connected devices from damage caused by incorrect circuit operation.

• Versatility: ideal for protecting lighting circuits, socket circuits and other resistive loads.

• Compact dimensions: saves space in the distribution box thanks to a width of only 1 module.

• Easy mounting: quick and easy mounting on a standard DIN TH35 rail.

• High reliability: confirmed by compliance with EN 60898-1 standard and high quality of ABB execution.

• Safety: insulation class II and protection degree IP20 ensure safe operation of the device.

• Durability: resistant to vibrations and shocks, ensuring long-term operation even in difficult conditions.

The ABB SZ201-B40 switch is an investment in the safety and reliability of the electrical installation – for both professionals and end users.