SCHNEIDER ELECTRIC NG125N 18645

Schneider Electric NG125N 125A 3-Pole Circuit Breaker

Description

The Schneider Electric 18645 is a high-performance NG125N series miniature circuit breaker (MCB). This 3-pole breaker is rated for 125A and features a C-trip curve, making it ideal for protecting circuits in commercial and industrial environments against both overloads and short circuits. Its robust design ensures reliability and a long service life.

Specifications

• Manufacturer: Schneider Electric
• Series: Multi 9 / NG125N
• Part Number: 18645
• Poles: 3-Pole (3P)
• Rated Current: 125 A
• Trip Curve: C
• Rated Voltage (Ue): 380/415 V AC
• Breaking Capacity (Icu): 25 kA
• Standard: Conforms to IEC/EN 60947-2

Label Info

• Model: NG125N
• Current Rating: C 125A
• Impulse Voltage (Uimp): 8kV
• Reference: 18645

Application

This circuit breaker is designed for use in industrial and commercial electrical distribution panels for the protection of main and sub-main circuits, motor circuits, and other high-load applications.

Country of Origin

Made in France.

CO2 Impact

Opting for this pre-owned unit over a new one prevents the emission of approximately 15.0 kg of CO2, contributing to a more sustainable industrial sector.

Availability

This is an obsolete but available item. Essential for repairs and maintenance of existing systems. Order now from spareparts2day for expert support and fast delivery.

FAQ

Question?
What is the difference between a C-curve and a D-curve circuit breaker?

A C-curve breaker, like this NG125N, is designed for general purpose applications with moderate inrush currents, like lighting and standard outlets. A D-curve breaker has a higher magnetic trip point and is used for circuits with very high inrush currents, such as large transformers or motors.

Question?
Can this NG125N breaker be used in a residential panel?

While technically possible, the NG125N is an industrial-grade breaker with a high breaking capacity (25 kA) designed for commercial or industrial distribution boards. Residential panels typically use breakers with lower breaking capacities (e.g., 6 kA or 10 kA) and this unit may not physically fit in a standard consumer unit.

Question?
What does the ‘Ics=75% Icu’ rating on the side mean?

This specification relates to its service breaking capacity (Ics). It means the breaker is guaranteed to operate reliably and be reusable after interrupting a fault current that is up to 75% of its ultimate breaking capacity (Icu). In this case, it can safely interrupt a 18.75 kA fault and remain in service.

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Last Update: Friday, March 13, 2026