Legrand 420229 DPX3 Thermal-Magnetic Circuit Breaker 4P 250A 25kA

The Legrand 420229 DPX3 thermal-magnetic circuit breaker is a robust electrical protection device designed for demanding industrial and commercial power distribution environments. Featuring a 4-pole configuration, this unit is engineered to manage a rated current of 250A with a breaking capacity of 25kA, providing a reliable solution for safeguarding electrical circuits against overloads and short-circuit events.

Advantages

This circuit breaker offers exceptional reliability and performance in complex electrical systems. Its thermal-magnetic design ensures precise response times during fault conditions, effectively preventing damage to downstream equipment and infrastructure. The compact and durable construction allows for seamless integration into standard distribution panels, while the high breaking capacity provides the necessary safety margin for heavy-duty electrical loads.

Suitable for

• Industrial power distribution networks
• Commercial building electrical installations
• Protection of main supply lines
• Heavy-duty machinery and equipment circuits

When it may not be suitable

This device is not intended for residential use in standard household circuits where lower current ratings are required. It is also not suitable for applications requiring electronic trip units with advanced communication or remote monitoring capabilities.

Key specifications

• Number of poles: 4
• Rated current: 250A
• Breaking capacity: 25kA
• Technology: Thermal-magnetic

How to use

The device must be installed by a qualified electrician in accordance with local electrical regulations. It is mounted within a distribution board or enclosure on a suitable support rail or backplate. Ensure all cable connections are tightened to the manufacturer's specified torque settings to prevent overheating and ensure optimal conductivity during operation.

What to consider before purchase

• Verify that the 250A rating matches your system load requirements
• Ensure the 25kA breaking capacity is sufficient for your installation's prospective short-circuit current
• Confirm that the 4-pole configuration is compatible with your power distribution scheme

Usage recommendations

Regularly inspect the circuit breaker for signs of wear or thermal damage and perform periodic testing to ensure the mechanical trip mechanism remains functional.