ABB SZ201-B25 Miniature Circuit Breaker, 1P, 25A, 6kA

The ABB SZ201-B25 is a high-performance 1-pole miniature circuit breaker engineered to provide robust protection for electrical circuits. Designed for both residential and commercial environments, this device effectively safeguards wiring and connected equipment against the risks of overloads and short circuits. It features a B-curve tripping characteristic, making it suitable for general applications where moderate surge currents are expected.

Advantages

This miniature circuit breaker stands out due to its reliable construction and adherence to international safety standards. The ABB SZ201-B25 offers consistent performance in power distribution systems, ensuring that electrical faults are detected and interrupted promptly to prevent damage to infrastructure. Its compact design allows for efficient space utilization within standard distribution boards, while the high-quality materials used in its manufacturing guarantee long-term operational durability and safety.

Suitable for

• Residential electrical distribution boards
• Commercial office lighting and power circuits
• Protection of general-purpose electrical appliances
• Small-scale industrial control panels

When it may not be suitable

This device is not intended for circuits with high inrush currents, such as those powering large motors or transformers, where a C or D curve breaker would be required to prevent nuisance tripping. It is also not suitable for use in environments exceeding its specified environmental operating temperature or humidity limits.

Key specifications

• Number of poles: 1
• Rated current: 25A
• Breaking capacity: 6kA
• Tripping characteristic: B-curve
• Mounting type: DIN rail

How to use

The ABB SZ201-B25 is designed for installation on a standard 35mm DIN rail within an electrical enclosure. Installation should be performed by a qualified electrician in accordance with local electrical codes. Ensure that the supply voltage is disconnected before mounting the device. Connect the incoming power supply to the top terminal and the outgoing circuit load to the bottom terminal, ensuring all connections are tightened to the manufacturer's specified torque settings.

What to consider before purchase

• Verify that the 25A rating matches the requirements of your circuit load.
• Ensure the B-curve characteristic is appropriate for the connected equipment.
• Confirm that the 6kA breaking capacity is sufficient for the prospective short-circuit current at the installation point.
• Check available space in your distribution board for a 1-pole module.

Usage recommendations

Regularly inspect the circuit breaker for signs of physical damage or discoloration. It is recommended to perform a functional test of the switching mechanism periodically to ensure smooth operation. If the breaker trips, investigate the cause of the fault before resetting the device.