18637 Schneider Electric Miniature circuit breaker (MCB), Acti9 NG125N, 3P, 40A, C curve, 25kA (IEC/EN 60947-2)

Short Description:
Schneider Electric 18637 Acti9 NG125N 3P 40A MCB delivers safe, reliable circuit protection. 25kA breaking capacity, C-curve tripping, compact DIN-rail design — built for professionals.

Key Features

• Part number: 18637
• Rated current: 40A, 3-pole (3P) configuration
• C tripping curve for mixed-load industrial and commercial systems
• 25kA short-circuit breaking capacity (EN/IEC 60947-2 compliant)
• Dual standard compliance: EN/IEC 60898-1 & 60947-2
• Compact DIN-rail mountable design (9-module width)
• Red mechanical indicator for clear trip status
• High endurance: 10,000 electrical / 20,000 mechanical cycles
• Voltage range: up to 500VAC , insulation 690V
• Temperature range: -30°C to +70°C

Where and How It's Used

The Schneider 18637 Acti9 NG125N is ideal for industrial panels, workshops, and commercial electrical systems. With its C-curve tripping and 25kA breaking capacity , it ensures safety for equipment and personnel — from motor protection to lighting circuits. Quick DIN-rail installation makes it a go-to choice for switchboards, control cabinets, and distribution panels.

Product Variants and Compatibility

Part of the trusted Acti9 NG125N range , available in 1P to 4P versions and rated from 20A to 125A. Fully compatible with Schneider Electric's Acti9 accessories , such as auxiliaries, shunt trips, and terminal shields.

Your Benefits at a Glance

• Reliable protection: 25kA breaking capacity prevents damage
• Universal compliance: IEC/EN certified for industrial & residential use
• Effortless mounting: Standard DIN rail for quick setup
• Long life: Up to 20,000 mechanical cycles
• Trusted brand: Original Schneider Electric 18637 model

Additional Information & Care

Installation should be carried out by a certified electrician.
Perform regular checks to ensure mechanical integrity and contact tightness for optimal safety.

Product Description

The Schneider Electric 18637 Acti9 NG125N 3-Pole 40A Miniature Circuit Breaker (MCB) represents a benchmark in industrial-grade protection and reliability. Built for demanding environments, it safeguards your circuits from both short-circuit and overload conditions with outstanding precision and endurance.

With a C-curve tripping characteristic , the 18637 NG125N ensures reliable operation for mixed loads — including lighting, HVAC systems, and small motors — without unwanted trips. Backed by a 25kA short-circuit breaking capacity , this breaker is engineered to perform under high fault conditions, keeping your electrical infrastructure safe.

Designed to comply with both EN/IEC 60898-1 and 60947-2 standards , the Acti9 NG125N bridges industrial and residential applications seamlessly. It supports a broad operational voltage range up to 500VAC , an insulation voltage of 690VAC , and withstands impulses up to 8kV , ensuring robustness even in challenging environments.

Installation is straightforward — the 9-module (81mm) width fits cleanly onto standard DIN rails , making it an ideal choice for compact panels and distribution boards. The red mechanical indicator on the front provides clear visual confirmation of tripping, aiding quick fault detection and maintenance.

Built to last, the 18637 NG125N delivers 10,000 electrical and 20,000 mechanical operations , minimizing downtime and ensuring long-term value. Its compact form, reliable mechanics, and proven safety features make it the preferred choice for electricians, contractors, and facility managers worldwide.

If you value safety, reliability, and Schneider Electric quality , the Acti9 NG125N 18637 is your go-to solution. Protect your installations with confidence — order now and experience durable, industrial-grade performance that lasts.