LEGRAND DX3 4078 22

Legrand DX3 Miniature Circuit Breaker with Auxiliary Contact

Description

This is a Legrand DX3 series three-pole miniature circuit breaker (MCB), part number 4078 22. It is engineered for superior overcurrent and short-circuit protection in industrial and commercial electrical systems. This model features a C-type tripping characteristic, making it ideal for general loads with moderate inrush currents. It is bundled with a pre-installed 4062 58 auxiliary contact for remote signaling of the breaker’s status.

Specifications

• Manufacturer: Legrand
• Series: DX3
• Part Number: 4078 22
• Rated Current: 2 A
• Number of Poles: 3-Pole
• Tripping Curve: C
• Rated Voltage: 400V AC
• Breaking Capacity (IEC/EN 60947-2): 10 kA
• Auxiliary Contact: 4062 58 (1NO+1NC, 6A, 240V AC)

Label Info

• Brand: Legrand
• Model: DX3 C2
• Order Code: 4078 22
• Standard: IEC60947-5-1 (for auxiliary)

Application

Suitable for protecting circuits against overloads and short circuits in commercial buildings, industrial facilities, and switchboards. The C-curve characteristic is designed for circuits powering lighting, socket outlets, and other general-purpose resistive or slightly inductive loads.

Country of Origin

Made in Italy.

CO2 Impact

By reusing this component, you are avoiding approximately 16 kg of CO2 emissions associated with the production of a new one.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the difference between the 6000A and 10kA breaking capacity ratings on this DX3 breaker?

The Legrand DX3 series is dual-rated. The 6000A rating corresponds to the IEC/EN 60898-1 standard for domestic installations, while the 10kA rating corresponds to the IEC/EN 60947-2 standard for industrial applications, which has more stringent testing requirements. This breaker is suitable for both.

Can the included auxiliary contact (4062 58) be removed or replaced?

Yes, the auxiliary contact is a modular accessory. It can be unclipped from the left side of the DX3 circuit breaker and replaced with another compatible Legrand DX3 accessory if needed, such as a shunt trip or a different contact configuration.

What does the ‘C’ in ‘C2’ signify for this circuit breaker’s application?

The ‘C’ refers to the tripping curve. A C-curve breaker is designed for general-purpose applications with moderate inrush currents, such as lighting, sockets, and small motors. It trips magnetically between 5 and 10 times the rated current (In), providing protection against both overloads and short circuits.

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Last Update: Friday, March 13, 2026