SCHNEIDER ELECTRIC DT40 C3A A9N21021

Schneider Electric DT40 Series RCBO

Description

This is a Residual Current Circuit Breaker with Overcurrent protection (RCBO) from the Schneider Electric DT40 series. It combines the functionality of a Miniature Circuit Breaker (MCB) and a Residual Current Device (RCD) into a single, DIN-rail mountable unit. This device offers comprehensive protection for final circuits against short-circuits, cable overloads, and electric shock hazards from direct or indirect contact.

Specifications

• Manufacturer: Schneider Electric
• Series: DT40
• Rated Current: 3 Amperes
• Tripping Curve: C
• Residual Current Sensitivity: 30 mA
• Number of Poles: 1P+N
• Rated Voltage: 230V AC
• Breaking Capacity: 4500 A (EN 60898), 6 kA (EN 60947-2)

Label Info

• MCB Part: DT40 C 3A, A9N21021
• RCD Add-on: Vigi DT40, A9N21450

Application

Ideal for use in residential, commercial, and light industrial electrical distribution boards for the protection of final circuits, such as lighting, sockets, and small appliances.

Country of Origin

This product is manufactured by Schneider Electric, with production facilities commonly located in France.

CO2 Impact

Opting for this pre-owned component avoids the production of a new one, saving an estimated 7.2 kg of CO2. This saving is comparable to the emissions from a 36 km car journey.

Availability

This item is an obsolete component but is available from our stock. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the difference between a Type AC and a Type A RCBO?

A Type AC device, like this Vigi DT40, is designed to trip on sinusoidal AC fault currents. A Type A device trips on both sinusoidal AC and pulsating DC fault currents, which are common with modern electronic equipment. For modern installations, Type A is often recommended or required.

Can the Vigi DT40 RCD block be replaced separately from the DT40 circuit breaker?

Yes, the Vigi DT40 is an add-on block. It clips onto the side of a compatible DT40 series miniature circuit breaker. This modular design allows for flexibility and replacement of individual components.

What does the ‘C’ in ‘C3A’ signify?

The ‘C’ refers to the tripping curve of the circuit breaker. A C-curve breaker is a general-purpose breaker that trips between 5 and 10 times the rated current. It is suitable for most applications, including resistive and inductive loads like lighting and sockets.

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Last Update: Friday, March 13, 2026