Schneider Electric Circuit Breaker 18644

Manufacturer: Schneider Electric
Designation: Circuit Breaker 125A C 3p NG125N
Type: 18644
Installation Depth: 47 mm
Tripping Characteristic: C
Number of Poles (total): 3
Number of Protected Poles: 3
Rated Current: 125 A
Rated Voltage: 400 V
Rated Insulation Voltage Ui: 690 V
Rated Impulse Voltage Uimp: 8 kV
Voltage Type: AC/DC
Rated Breaking Capacity Icu according to IEC 60947-2 at 230 V: 50 kA
Rated Breaking Capacity Icu according to IEC 60947-2 at 400 V: 25 kA
Frequency: 50-60 Hz
Flush Mounting: no
Switching Neutral Conductor: no
Overvoltage Category: 4
Degree of Pollution: 3
Additional Devices Possible: yes
Width in Division Units: 4.5
Protection Class (IP): IP20
Ambient Temperature during Operation: -30 to 70 °C
Connectable Conductor Cross-Section Multi-Wire: 10 to 50 mm²
Connectable Conductor Cross-Section Single-Wire: 16 to 70 mm²
Explosion-Proof: no

The Acti 9 NG125N circuit breaker has a rated breaking capacity of 25 kA (IEC/EN 60947-2), is 3-pole, and has a rated current of 16 A. The operating voltage (Ue) is 380-415 V AC, and the insulation voltage (Ui) is 690 V AC. It protects the circuit against short-circuit and overload currents. The tripping is indicated by the central position of the switching lever and a red mechanical display on the front of the device. A test button for checking the tripping mechanism is included. The supply can be connected from the top or bottom. The circuit breaker features a snap-action mechanism for low-wear switching of contacts and uses a thermal-magnetic tripping unit. Additionally, stackable auxiliary modules (optional) are available, allowing for the display of switching positions, fault trippings, operational current trippers, undervoltage trippers, and overvoltage trippers. The NG125N circuit breaker meets the standards IEC/EN 60947-2 and is VDE certified.