Circuit breaker 25kA, In=125A, characteristic B. 1-pole. AZ-B125 174488

Overcurrent switch – reliable protection of electrical installations

This single-pole overcurrent switch from Eaton's AZ series, with a rated current of 125A and B characteristic, is a key element ensuring safety 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. Its compact size – only 1.5 modules wide – makes it easy to install even in crowded distribution boards.

Functionality and technical parameters

The switch is characterized by a high breaking capacity of up to 25kA, making it suitable for applications requiring high resistance to sudden current surges. The B characteristic ensures a quick response to overloads, while allowing for short-term peak loads without unnecessary tripping. The rated voltage of 230V and the insulation voltage Ui of 440V guarantee safe and reliable operation in standard electrical installations. Energy limitation class 3 and surge category III confirm its compliance with demanding safety standards.

• Rated current of 125A – ideal for circuits with high power demand.
• B characteristic provides a quick response to overloads, while tolerating short-term peak loads (e.g., motor starting).
• High breaking capacity of 25kA – increased installation safety thanks to resistance to sudden current surges.
• Only 1.5 modules wide – saves space in the distribution board.
• Standard rated voltage of 230V – compatibility with most domestic and industrial installations.
• Protection degree IP20 provides protection against finger contact and is suitable for mounting in distribution enclosures.

Installation and application

The switch is designed for mounting on a TH35 rail (standard mounting rail). The possibility of equipping it with additional accessories (e.g., auxiliary contacts, release coils) allows it to be adapted to the specific needs of the installation. It will work well both in residential construction (protection of lighting and socket circuits), and in industrial facilities and railway infrastructure (where high strength parameters are required). The installation depth of 75mm ensures convenience during installation and maintenance.