Schneider A9N18376 Miniature Circuit Breaker (MCB), Acti9 C120N, 4P C125A 10kA

The Schneider Electric A9N18376 is a 4-pole miniature circuit breaker (MCB) from the Acti 9 C120N series, rated at 125 A with a C tripping characteristic. Designed for electrical power distribution, it provides thermomagnetic protection with a breaking capacity of 10 kA at 230-400 V AC, making it suitable for demanding industrial and commercial installations.

Technical specifications:

• Commercial reference: A9N18376
• Manufacturer: Schneider Electric
• Series / range: Acti 9 C120
• Product type: Miniature Circuit Breaker (MCB)
• Number of poles: 4P
• Number of protected poles: 4
• Rated current [In]: 125 A at 30 °C
• Tripping characteristic: C
• Network type: AC
• Protection unit technology: Thermomagnetic
• Breaking capacity [Icn]: 10 kA at 230-400 V AC 50/60 Hz per EN/IEC 60898-1
• Breaking capacity [Icu]: 20 kA at 220-240 V AC / 10 kA at 380-415 V AC / 6 kA at 440 V AC / 10 kA at <=500 V DC per EN/IEC 60947-2
• Service breaking capacity [Ics]: 7500 A (75%) at 230-400 V AC per EN/IEC 60898-1
• Rated voltage [Ue]: 380-415 V AC 50/60 Hz / 220-240 V AC / 440 V AC / <=500 V DC
• Rated insulation voltage [Ui]: 500 V AC per EN/IEC 60947-2
• Rated impulse withstand voltage [Uimp]: 6 kV per EN/IEC 60947-2
• Overcurrent protection limit: 5-10 x In
• Limitation class: 3 per EN/IEC 60947-2
• Network frequency: 50/60 Hz
• Dimensions (WxHxD): 108 x 81 x 73 mm
• Weight: 0.82 kg
• Mounting: Clip-on, 35 mm symmetrical DIN rail
• Connection terminals: Tunnel terminals 1-50 mm² solid / 1.5-35 mm² flexible
• Strip length: 15 mm
• Tightening torque: 3.5 N.m
• IP rating: IP20 per IEC 60529
• Operating temperature: -25 to 70 °C
• Storage temperature: -40 to 85 °C
• Operating altitude: up to 2000 m
• Relative humidity: 95% at 55 °C
• Pollution degree: 3 per IEC 60947-2
• Overvoltage category: IV
• Mechanical durability: 20,000 cycles
• Electrical durability: 5,000 cycles per IEC 60947-2
• Standards: EN/IEC 60947-2, EN/IEC 60898-1
• Certification: EAC
• Warranty: 18 months

Features and benefits:

• Suitable for isolation per IEC 60947-2, allowing use as a disconnection device
• Handle sealable with cable diameter 0.7 mm in OFF or ON position for tamper protection
• Compatible with comb busbar distribution blocks for simplified panel wiring
• Contact position indicator and ON/OFF local signalling for clear status reading
• Tropicalization grade 2 per IEC 60068-1 for use in humid environments
• Wide operating temperature range of -25 to 70 °C for versatile installation conditions

Applications:

• Main and sub-main protection in industrial and commercial electrical distribution boards
• Protection of outgoing circuits in low-voltage switchgear and controlgear assemblies
• Distribution panels requiring high breaking capacity with DC voltage compatibility
• Installations requiring isolation capability alongside overcurrent protection
• Industrial control panels operating in high pollution or humid environments

Compliant with EN/IEC 60947-2 and EN/IEC 60898-1. Part of the Schneider Electric Acti 9 C120 range.

Also known as: Schneider A9N18376, Schneider Electric A9N18376, Acti9 C120N 4P 125A MCB, Schneider 125A 4-pole miniature circuit breaker.