SCHNEIDER ELECTRIC DT40 A9N21021

Schneider Electric DT40 A9N21021 Circuit Breaker

Description

The Schneider Electric DT40 A9N21021 is a high-quality miniature circuit breaker (MCB) designed for reliable protection of electrical circuits against short circuits and overloads. This component is part of the trusted DT40 range, known for its robustness and performance in various applications. It is easy to install on a standard DIN rail.

Specifications

• Manufacturer: Schneider Electric
• Series: DT40
• Model: A9N21021
• Poles: 1 Pole + Neutral (1P+N)
• Rated Current: 3 A
• Tripping Curve: C
• Rated Operational Voltage (Ue): 230V AC at 50/60Hz
• Rated Breaking Capacity (Icu): 6 kA according to EN/IEC 60947-2
• Rated Impulse Withstand Voltage (Uimp): 4 kV

Label Info

• EAN: 3606480381164
• Standard: EN60947-2

Application

This circuit breaker is ideal for use in residential, commercial, and industrial distribution boards for protecting lighting circuits, socket outlets, and other general loads where moderate inrush currents are expected.

Country of Origin

Made in France.

CO2 Impact

By purchasing this reused component, you are contributing to a circular economy and helping to avoid approximately 5.0 kg of CO2 emissions that would be generated from manufacturing 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 breaking capacity (Icu) of this A9N21021 circuit breaker?

The rated ultimate short-circuit breaking capacity (Icu) is 6 kA at 230V AC, as specified by the EN/IEC 60947-2 standard. This makes it suitable for most commercial and residential applications.

Is this DT40 breaker compatible with Acti9 distribution boards and accessories?

While the DT40 series is a predecessor to the Acti9 line, it shares the same DIN rail mounting standard. It is physically compatible with most distribution boards, but for specific accessories like busbars or auxiliary contacts, you should verify compatibility as the designs may differ slightly from the newer Acti9 system.

What does the ‘C-Curve’ designation mean for this MCB?

The C-Curve (or C-characteristic) indicates that the breaker will trip magnetically between 5 and 10 times its rated current (In). This makes it a versatile choice for protecting general-purpose circuits with devices like lighting, sockets, and small motors that have a moderate inrush current upon startup.

Last Update: Friday, March 13, 2026

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