Schneider 18805 Miniature Circuit Breaker (MCB), Acti9 NG125L, 3P C50A 50kA

The Schneider Electric 18805 is a 3-pole miniature circuit breaker (MCB) from the Acti 9 NG125L series, rated at 50 A with a C tripping curve. Designed for electrical energy distribution, it delivers exceptional breaking capacity of up to 100 kA at 220-240 V AC, making it suitable for demanding industrial and commercial installations.

Technical specifications:

• Commercial reference: 18805
• Manufacturer: Schneider Electric
• Series / range: Acti 9 NG125
• Device short name: NG125L
• Product type: Miniature Circuit Breaker (MCB)
• Number of poles: 3P
• Number of protected poles: 3
• Rated current [In]: 50 A at 40 °C
• Tripping curve: C
• Network type: AC / DC
• Protection unit technology: Thermomagnetic
• Breaking capacity [Icu]: 100 kA at 220-240 V AC 50/60 Hz - EN/IEC 60947-2
• Breaking capacity [Icu]: 50 kA at 380-415 V AC 50/60 Hz - EN/IEC 60947-2
• Breaking capacity [Icu]: 40 kA at 440 V AC 50/60 Hz - EN/IEC 60947-2
• Breaking capacity [Icu]: 15 kA at 500 V AC 50/60 Hz - EN/IEC 60947-2
• Breaking capacity [Icu]: 36 kA at 375 V DC - EN/IEC 60947-2
• Service breaking capacity [Ics]: 75 kA at 220-240 V AC
• Rated voltage [Ue]: 220-240 V / 380-415 V / 440 V / 500 V AC; 375 V DC
• Rated insulation voltage [Ui]: 690 V AC 50/60 Hz
• Rated impulse withstand voltage [Uimp]: 8 kV
• Overcurrent protection limit: 8 x In +/- 20%
• Use category: Category A - IEC 60947-2
• Standard: EN/IEC 60947-2
• Mounting: 35 mm symmetrical DIN rail
• Mounting position: Vertical handle
• Width: 81 mm
• Height: 103 mm
• Depth: 81 mm
• Product weight: 0.72 kg
• Connection type: Tunnel terminals 1.5-50 mm² rigid; 1-35 mm² flexible
• Strip length: 20 mm
• Tightening torque: 3.5 N.m
• IP protection rating: IP20 - IEC 60529
• IK protection rating: IK05 - EN/IEC 62262
• Operating temperature: -30 to 70 °C
• Storage temperature: -40 to 70 °C
• Relative humidity: 95% at 55 °C
• Operating altitude: up to 2000 m
• Pollution degree: 3 - IEC 60947-2
• Overvoltage category: IV
• Mechanical endurance: 20000 cycles
• Electrical endurance: 10000 cycles
• Lockable: Yes - integrated locking
• Busbar comb distribution block: Yes
• Warranty: 18 months

Features and benefits:

• High breaking capacity of 100 kA at 220-240 V AC for protection in demanding distribution applications
• Suitable for both AC and DC networks up to 375 V DC
• Snap-on DIN rail mounting with vertical handle position for easy panel installation
• Integrated trip indicator and ON/OFF status readout for fast fault diagnosis
• Wide conductor acceptance from 1.5 to 50 mm² rigid cable, accommodating diverse wiring needs
• Compatible with separate differential protection block for enhanced circuit safety

Applications:

• Main and sub-distribution boards in commercial and industrial electrical installations
• Protection of outgoing feeders in low-voltage switchgear and controlgear assemblies
• Industrial panel boards requiring high breaking capacity and reliable overcurrent protection
• DC distribution systems up to 375 V in renewable energy or battery-backed installations

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

Also known as: Schneider 18805, Schneider Electric 18805, NG125L 3P 50A C curve MCB, Acti9 NG125L 50A circuit breaker.