Schneider 18638 Acti9 NG125N Miniature circuit breaker 3P C50A 25kA

The Schneider Electric 18638 (NG125N) is a 3-pole miniature circuit breaker from the Acti 9 range, rated at 50A with a C tripping characteristic. Designed for electrical energy distribution, it offers a breaking capacity of 25kA at 380-415V AC and supports both AC and DC network types with thermomagnetic protection technology.

Technical specifications:

• Commercial reference: 18638
• Manufacturer: Schneider Electric
• EAN:
• Series / range: Acti 9 NG125
• Device short name: NG125N
• Product type: Miniature Circuit Breaker (MCB)
• Number of poles: 3P
• Number of protected poles: 3
• Rated current [In]: 50A at 40°C
• Tripping curve: C
• Protection technology: Thermomagnetic
• Network type: AC / DC
• Rated voltage [Ue]: 220-240V AC 50/60Hz / 380-415V AC 50/60Hz / 440V AC 50/60Hz / 500V AC 50/60Hz / up to 375V DC
• Breaking capacity [Icu]: 50kA at 220-240V AC; 25kA at 380-415V AC; 20kA at 440V AC; 10kA at 500V AC; 20kA at up to 375V DC (EN/IEC 60947-2)
• Service breaking capacity [Ics]: 37.5kA at 220-240V AC; 18.75kA at 380-415V AC; 15kA at 440V AC; 7.5kA at 500V AC
• Rated insulation voltage [Ui]: 690V AC 50/60Hz
• Rated impulse withstand voltage [Uimp]: 8kV
• Overcurrent protection limit: 8 x In
• Usage category: Category A (IEC 60947-2)
• Mounting: 35mm symmetrical DIN rail, clip-on
• Handle position: Vertical
• Width: 81mm
• Height: 103mm
• Depth: 81mm
• Weight: 0.72kg
• Connection type: Tunnel terminals 1.5-50mm² rigid / 1-35mm² flexible
• Strip length: 20mm
• Tightening torque: 3.5 N.m
• IP rating: IP20 (IEC 60529)
• IK rating: IK05 (EN/IEC 62262)
• Operating temperature: -30 to 70°C
• Storage temperature: -40 to 70°C
• Relative humidity: 95% at 55°C
• Overvoltage category: IV
• Pollution degree: 3 (IEC 60947-2)
• Mechanical durability: 20,000 cycles
• Electrical durability: 10,000 cycles
• Standards: EN/IEC 60947-2
• Warranty: 18 months

Features and benefits:

• Suitable for isolation per IEC 60947-2, enabling safe maintenance and lockout procedures
• Integrated lockout preparation with built-in locking capability for enhanced safety compliance
• Contact position indicator and trip indicator for clear local ON/OFF and fault status reading
• Compatible with comb busbar distribution blocks, supporting 9mm pitch rows for efficient panel wiring
• Wide operating temperature range (-30 to 70°C) for reliable performance in demanding environments
• Tropicalisation rating 2 (IEC 60068-1) and high humidity tolerance for use in harsh conditions

Applications:

• Final and sub-distribution boards in commercial and industrial electrical installations
• Protection of outgoing circuits in AC distribution panels at 380-415V and 220-240V
• DC circuit protection in photovoltaic and battery-backed power distribution systems (up to 375V DC)
• Industrial control panels requiring high breaking capacity up to 50kA
• Applications requiring lockable circuit protection for safety and maintenance isolation

Compliant with EN/IEC 60947-2. Part of the Schneider Electric Acti 9 NG125 range.

Also known as: Schneider 18638, Schneider Electric 18638, NG125N 3P 50A MCB, Acti9 NG125N C50 3-pole circuit breaker.