MERLIN GERIN NS400N 32403

Merlin Gerin Moulded Case Circuit Breaker Frame 400A 3P NS400N 32403

Description

This is the Compact NS400N circuit breaker frame from Merlin Gerin (a brand of Schneider Electric), with part number 32403. This unit is a 3-pole base frame designed for a rated current of up to 400A. Please note that this is the breaker frame only and requires a compatible trip unit to function as a complete circuit breaker. It is an ideal replacement part for existing installations using the Compact NS series. Order now from spareparts2day for expert support and fast delivery.

Specifications

• Manufacturer: Merlin Gerin (Schneider Electric)
• Product Line: Compact NS
• Model: NS400N
• Part Number: 32403
• Type: Circuit Breaker Frame (Base Unit)
• Number of Poles: 3P (3-Pole)
• Rated Current (In): 400 A
• Rated Insulation Voltage (Ui): 750 V AC
• Rated Impulse Withstand Voltage (Uimp): 8 kV
• Frequency: 50/60 Hz

Label Info

• Breaking Capacity (Icu) at 220/240V: 90 kA
• Breaking Capacity (Icu) at 380/415V: 85 kA
• Breaking Capacity (Icu) at 500/525V: 50 kA
• Breaking Capacity (Icu) at 690V: 40 kA
• Compliance: IEC / EN 60947-2

Application

This MCCB frame is designed for use in industrial and commercial electrical distribution systems for overload and short-circuit protection. It is commonly used in switchboards, motor control centers, and main distribution panels.

Country of Origin

Made in Italy.

CO2 Impact

Reusing this component saves approximately 90.0 kg of CO2, which is comparable to the emissions from driving a standard car for 450 kilometers.

Availability

This product is an obsolete item but is available from our stock as a new old stock (NOS) part. It comes in its original box with accessories.

FAQ

Is this a complete circuit breaker?

No, this is a circuit breaker frame or base (part number 32403). It requires a compatible Compact NS trip unit, which must be purchased separately, to be a functional circuit breaker.

What is the breaking capacity (Icu) of this frame?

The breaking capacity depends on the operating voltage. According to the label, it has an Icu of 85kA at 380/415V, 50kA at 500/525V, and 40kA at 690V AC.

Can I use a new Compact NSX trip unit with this older Compact NS frame?

No, the Compact NS and Compact NSX series have different mechanical and electrical interfaces. You must use a trip unit specifically designed for the NS400N frame.

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Last Update: Friday, March 13, 2026