Schneider 18861 Miniature Circuit Breaker (MCB), Acti9 NG125L, 4P D32A 50kA

The Schneider Electric 18861 is a 4-pole miniature circuit breaker (MCB) from the Acti9 NG125L series, rated at 32A with a D tripping curve and a breaking capacity of 50kA at 380-415V AC, designed for distribution applications in industrial and commercial installations.

Technical specifications:

• Commercial reference: 18861
• Manufacturer: Schneider Electric
• EAN:
• Series / range: Acti9 NG125
• Product type: Miniature circuit breaker (MCB)
• Device application: Distribution
• Number of poles: 4P
• Number of protected poles: 4
• Neutral position: Left
• Rated current [In]: 32A at 40°C
• Tripping curve: D
• Trip unit technology: Thermal-magnetic
• Network type: AC / DC
• Breaking capacity [Icu]: 100kA at 220-240V AC - 50kA at 380-415V AC - 40kA at 440V AC - 15kA at 500V AC - 36kA at 500V DC (EN/IEC 60947-2)
• Rated service breaking capacity [Ics]: 75kA at 220-240V AC - 37.5kA at 380-415V AC (EN/IEC 60947-2)
• Rated insulation voltage [Ui]: 690V AC
• Rated impulse withstand voltage [Uimp]: 8kV
• Magnetic tripping limit: 12 x In +/- 20%
• Utilisation category: Category A (IEC 60947-2)
• Mounting: Clip-on, 35mm symmetrical DIN rail, vertical
• Width: 108mm - Height: 103mm - Depth: 81mm
• Weight: 0.96kg
• Connection terminals: Tunnel type, 1.5-50mm² rigid / 1-35mm² flexible
• Tightening torque: 3.5 N.m
• IP protection rating: IP20 (IEC 60529)
• IK protection: IK05 (EN/IEC 62262)
• Operating temperature: -30 to 70°C
• Storage temperature: -40 to 70°C
• Operating altitude: 2000m
• Pollution degree: 3 (IEC 60947-2)
• Standard: EN/IEC 60947-2
• Mechanical durability: 20000 cycles
• Electrical durability: 10000 cycles

Features and benefits:

• High breaking capacity of 50kA at 380-415V AC ensures reliable protection in demanding distribution networks
• D curve thermal-magnetic trip unit suitable for loads with high inrush currents
• Suitability for isolation confirmed per IEC 60947-2, enabling safe maintenance procedures
• Integrated padlocking provision for lockout/tagout safety compliance
• Compatible with comb busbars and distribution blocks for flexible panel wiring
• Wide operating temperature range (-30 to 70°C) supports use in harsh environments

Applications:

• Industrial distribution boards and motor control centers requiring high breaking capacity
• Commercial and industrial panels with loads exhibiting high inrush currents (D curve)
• Power distribution in buildings with elevated short-circuit levels
• Main and sub-distribution panels in factories, warehouses, and infrastructure projects

Compliant with EN/IEC 60947-2. Part of the Schneider Electric Acti9 NG125 range.

Also known as: Schneider 18861, Schneider Electric 18861, NG125L 4P D32A, Acti9 NG125L MCB 32A.