Schneider 18639 Acti9 NG125N Miniature circuit breaker 3P C63A 25kA

The Schneider Electric 18639 is a 3-pole miniature circuit breaker from the Acti 9 NG125N series, designed for electrical energy distribution. It delivers a rated current of 63 A at 40°C with a C tripping characteristic and a breaking capacity of 25 kA at 380-415 V AC, conforming to IEC 60947-2.

Technical specifications:

• Commercial reference: 18639
• Manufacturer: Schneider Electric
• EAN:
• Series / range: Acti 9 NG125
• Product type: Miniature circuit breaker (MCB)
• Short device name: NG125N
• Number of poles: 3P
• Number of protected poles: 3
• Rated current [In]: 63 A at 40°C
• Tripping curve: C
• Network type: AC / DC
• Protection technology: Thermomagnetic
• Breaking capacity [Icu]: 50 kA at 220-240 V AC 50/60 Hz; 25 kA at 380-415 V AC 50/60 Hz; 20 kA at 440 V AC 50/60 Hz; 10 kA at 500 V AC 50/60 Hz; 20 kA at <=375 V DC
• Service breaking capacity [Ics]: 37.5 kA (220-240 V AC); 18.75 kA (380-415 V AC); 15 kA (440 V AC); 7.5 kA (500 V AC); 20 kA (<=375 V DC)
• Rated voltage [Ue]: 220-240 V / 380-415 V / 440 V / 500 V AC 50/60 Hz; <=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
• Utilisation category: Category A per IEC 60947-2
• Dimensions (WxHxD): 81 x 103 x 81 mm
• Weight: 0.72 kg
• IP protection rating: IP20 per IEC 60529
• IK protection rating: IK05 per EN/IEC 62262
• Operating temperature: -30 to 70°C
• Storage temperature: -40 to 70°C
• Relative humidity: 95% at 55°C
• Mounting: 35 mm symmetrical DIN rail, clip-on
• Handle position: Vertical
• Connection type: Tunnel terminals 1.5-50 mm² rigid; 1-35 mm² flexible
• Wire strip length: 20 mm
• Tightening torque: 3.5 N.m
• Mechanical durability: 20,000 cycles
• Electrical durability: 10,000 cycles
• Busbar comb compatible: Yes (9 mm pitch, 9 rows)
• Standard: EN/IEC 60947-2

Features and benefits:

• High breaking capacity of 25 kA at 380-415 V AC, suitable for demanding industrial distribution applications
• Thermomagnetic protection unit provides reliable overcurrent and short-circuit protection
• Suitable for both AC and DC networks, offering installation flexibility
• Lockable handle with integrated locking preparation for controlled access and safety
• Contact position indicator and trip indicator for quick local status reading
• Clip-on DIN rail mounting with busbar comb compatibility for fast, organized panel assembly

Applications:

• Main and sub-distribution boards in commercial and industrial buildings
• Protection of outgoing circuits in electrical distribution panels
• Industrial control panels requiring high breaking capacity protection
• Applications combining AC and DC network protection requirements

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

Also known as: Schneider 18639, Schneider Electric 18639, NG125N 3P 63A MCB, Acti9 63A circuit breaker.