SCHNEIDER ELECTRIC NG125L 18843

Schneider Electric NG125L 32A 2P D-Curve Circuit Breaker

Description

The Schneider Electric 18843 is a high-performance miniature circuit breaker from the Acti9 NG125L series. This 2-pole device is rated for 32 Amperes with a D-curve tripping characteristic, making it suitable for circuits with high inrush currents, such as motors and transformers. It offers a very high ultimate breaking capacity (Icu) of 50 kA at 380/415V AC, ensuring maximum safety and protection in demanding industrial and commercial environments.

Specifications

• Manufacturer: Schneider Electric
• Part Number: 18843
• Model: NG125L
• Number of Poles: 2P
• Rated Current (In): 32 A
• Tripping Curve: D
• Rated Operational Voltage (Ue): 380/415 V AC
• Rated Insulation Voltage (Ui): 690 V
• Rated Impulse Withstand Voltage (Uimp): 8 kV
• Breaking Capacity (Icu): 50 kA at 380/415V AC according to IEC 60947-2

Label Info

• Merlin Gerin (Brand of Schneider Electric)
• Made in France
• Standard: IEC/EN 60947-2

Application

This circuit breaker is ideal for protecting main distribution boards, motor circuits, and other high-power electrical installations in industrial plants, commercial buildings, and infrastructure projects where reliability and high performance are critical.

Country of Origin

This product is proudly Made in France.

CO2 Impact

Opting for a reconditioned Schneider Electric 18843 circuit breaker prevents the emission of approximately 18.0 kg of CO2 compared to manufacturing a new one. This saving is equivalent to the CO2 absorption of a small tree over several years.

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 significance of the ‘D’ curve on this NG125L breaker?

The D-curve is designed for circuits with very high inrush currents. It has the highest magnetic trip point, typically tripping between 10 and 20 times the rated current (In). This makes it ideal for protecting transformers, motors, and other inductive loads that draw a large amount of current upon startup.

Can this 2P breaker be used in a single-phase L+N system?

Yes, a 2-pole (2P) breaker like this one disconnects both the Line (L) and Neutral (N) conductors simultaneously. This provides complete isolation of the circuit and is a common requirement for safety in many single-phase applications, especially in TT and certain TN-S earthing systems.

What is the difference between the breaking capacity Icu (50 kA) and Ics?

Icu (Ultimate Breaking Capacity) is the maximum fault current a breaker can interrupt without being damaged. Ics (Service Breaking Capacity) is a percentage of Icu (in this case, 75%) and represents the maximum fault current a breaker can clear and remain in serviceable condition, ready for re-use. The NG125L’s high Ics rating indicates excellent durability and reliability.

spareparts2day is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners.

Last Update: Friday, March 13, 2026