Circuit breaker 25kA, In=125A, characteristic B. 4-pole. AZ-4-B125 174540

Overcurrent circuit breaker – reliable protection for electrical installations

This four-pole overcurrent circuit breaker from Eaton's AZ series, with a rated current of 125A and B characteristic, is a key safety element in every electrical installation. Designed to protect against overloads and short circuits, it ensures safe use and long-term reliability. A rated short-circuit breaking capacity of 25kA guarantees an effective response in emergency situations, minimizing the risk of damage and fire.

Construction and application

The AZ-4-B125 circuit breaker is designed for mounting on a TH35 rail, making it easy to install and integrate with existing systems. A width of 6 modules allows for efficient use of space in the distribution board. Energy limitation class 3 and surge category 3 confirm its high resistance to interference and ability to operate in harsh conditions. The B characteristic means that the circuit breaker reacts quickly to short circuits, but tolerates short-term current surges during the starting of devices with motors – which is particularly important in industrial and domestic installations with a large number of inductive loads.

• Versatile application: ideal for protecting lighting circuits, socket circuits and resistive and inductive loads.
• Mounting: easy mounting on a TH35 rail – a standard solution in most distribution boards.
• Compliance with standards: meets the requirements of IEC 60947-2, ensuring safety and reliability.
• Expandability: compatible with a wide range of auxiliary accessories, allowing you to customize functionality to individual needs.

Technical parameters and benefits for professionals

This circuit breaker is distinguished by its solid construction and high technical parameters. Rated voltage 400V and insulation voltage Ui 440V guarantee safe operation in typical electrical installations. The degree of protection IP20 provides protection against accidental contact. The rated short-circuit breaking capacity Icu is 15kA at 230V and 15kA at 400V – these values demonstrate the effectiveness of the circuit breaker in the event of a short circuit. In addition, railway approvals confirm its high quality and reliability in demanding industrial applications. Thanks to this, installers can be sure that they are offering their customers a top-class product that meets all safety standards.