Complementary
[Ui] rated insulation voltage	800 V AC 50/60 Hz
[Uimp] rated impulse withstand voltage	8 kV
[Ics] rated service breaking capacity	100 kA at 500 V AC 50/60 Hz conforming to IEC 60947-2; 100 kA at 525 V AC 50/60 Hz conforming to IEC 60947-2; 100 kA at 660/690 V AC 50/60 Hz conforming to IEC 60947-2
Mechanical durability	20000 cycles
Electrical durability	20000 cycles at 440 V In/2; 10000 cycles at 440 V In; 10000 cycles at 690 V In/2; 5000 cycles at 690 V In
Power dissipation per pole	11.78 W
Mounting support	Backplate
Mounting position	Horizontal and vertical; Flat on the back
Upside connection	Front
Downside connection	Front
Connection pitch	35 mm
Protection type	L : for overload protection (thermal); I : for short-circuit protection (magnetic)
Trip unit rating	160 A at 40 °C
Long-time pick-up adjustment type Ir (thermal protection)	Adjustable
[Ir] long-time protection pick-up adjustment range	0.7...1 x In
Long-time protection delay adjustment type tr	Fixed
[tr] long-time delay adjustment range	120…400 s at 1.5 x In; 15 s at 6 x Ir
Instantaneous protection pick-up adjustment type Ii	Fixed
[Ii] instantaneous protection pick-up adjustment range	1250 A
Earth-leakage protection	Without
Number of slots	5 slot(s)
Width (W)	105 mm
Height (H)	161 mm
Depth (D)	86 mm
Net weight	2.4 kg
Contractual warranty
Warranty (in months)	18
Environment
Standards	EN/IEC 60947-2
Overvoltage category	III
Electrical shock protection class	Class II on front face
Pollution degree	3 conforming to IEC 60664-1
IP degree of protection	IP40 conforming to IEC 60529
IK degree of protection	IK07 conforming to IEC 62262
Ambient air temperature for operation	-25…70 °C
Ambient air temperature for storage	-50…85 °C
Relative humidity	0…95 %
Operating altitude	0...2000 m without derating; 2000 m...5000 m with derating
Logistical informations
Country of origin	PL
Main
Range	ComPacT
Product name	ComPacT NSX
Device short name	NSX250HB2
Product or component type	Circuit breaker
Device application	Distribution
Poles description	3P
Protected poles description	3D
[In] rated current	160 A at 40 °C
[Ue] rated operational voltage	690 V AC 50/60 Hz
Network type	AC
Network frequency	50/60 Hz
Suitability for isolation	Yes conforming to EN/IEC 60947-2
Utilisation category	Category A
Breaking capacity	100 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2; 100 kA Icu at 525 V AC 50/60 Hz conforming to IEC 60947-2; 100 kA Icu at 660/690 V AC 50/60 Hz conforming to IEC 60947-2
Breaking capacity code	HB2 100 kA 690 V AC
Trip unit name	TM-D
Trip unit technology	Thermal-magnetic
Trip unit protection functions	LI
Control type	Toggle
Circuit breaker mounting mode	Fixed
Packing Units
Unit Type of Package 1	PCE
Number of Units in Package 1	1
Package 1 Height	11.000 cm
Package 1 Width	14.000 cm
Package 1 Length	20.000 cm
Package 1 Weight	1.960 kg
Unit Type of Package 2	S03
Number of Units in Package 2	4
Package 2 Height	30.000 cm
Package 2 Width	30.000 cm
Package 2 Length	40.000 cm
Package 2 Weight	8.260 kg
Unit Type of Package 3	P12
Number of Units in Package 3	32
Package 3 Height	45.000 cm
Package 3 Width	80.000 cm
Package 3 Length	120.000 cm
Package 3 Weight	78.080 kg

The ComPacT NSX250HB2 from Schneider Electric is a 3-pole circuit breaker designed for fixed mounting, intended for distribution in industrial and commercial installations. It belongs to the ComPacT series and features a thermomagnetic trip unit of type TM-D, providing an adjustable thermal overload protection (L) and a fixed magnetic short-circuit protection (I). The protection functions are tailored to the requirements of distribution systems, with the thermal protection offering long-term overload protection and the magnetic protection ensuring immediate disconnection in case of short-circuit. The rated current is 160 A at an ambient temperature of 40 °C, with the thermal protection adjustment range between 0.7 and 1 x In. The thermal protection time delay is fixed, ranging from 120 to 400 seconds at 1.5 x In and 15 seconds at 6 x Ir. The instantaneous short-circuit protection is set at 1,250 A. The circuit breaker is designed for an operating voltage of 690 V AC at 50/60 Hz and has a rated short-circuit breaking capacity (Icu) of 100 kA at 500 V, 525 V, and 660/690 V AC, making it suitable for applications with high short-circuit currents. The rated insulation voltage is 800 V AC, and the rated impulse withstand voltage is 8 kV, ensuring high electrical strength. The mechanical life is 20,000 cycles, while the electrical life varies depending on operating voltage and load, reaching 5,000 cycles at 690 V and full load. The power loss per pole is 11.78 W, which is relevant for heat dissipation and operational safety.

Applications
This circuit breaker is suitable for distribution in industrial and commercial electrical installations, particularly in environments with high electrical loads and safety requirements. It is designed for use in Category A environments, indicating application in industrial or commercial facilities. The operating temperature ranges from -25 °C to 70 °C, and the relative humidity can reach up to 95 %, provided no condensation occurs. The operating altitude is up to 2,000 m without performance reduction; beyond this, performance derating is required. The IP40 protection rating according to IEC 60529 protects against contact with solid objects larger than 1 mm and against splashing water, making the breaker suitable for indoor installations. The IK07 protection rating according to IEC 62262 provides protection against mechanical impacts, such as a 0.7 J hammer blow, making it suitable for installations with low mechanical stress. The Class II protection on the front side means the breaker does not require a protective earth connection, as it is protected by double or reinforced insulation.

Functions and Features in Detail
The breaker features a toggle switch as the operating mechanism, intended for manual operation. Mounting is fixed to a back panel, with possible orientations being horizontal, vertical, or inverted. Connections are located on the front side, both top and bottom, and are designed for a 35 mm mounting pitch, enabling standardized installation. Dimensions are 105 mm (width) x 161 mm (height) x 86 mm (depth), and the product weight is 2.4 kg. The breaker is designed for use in Overvoltage Category III, indicating installation in systems with high electrical stress. The pollution degree is 3 according to IEC 60664-1, indicating a high level of environmental contamination. The breaker is not equipped with earth fault protection, meaning it does not offer specific functions for earth fault protection. The number of auxiliary device slots is 5, allowing integration of additional modules such as auxiliary switches, communication modules, or measuring devices.

Technology Explained Simply
The thermomagnetic trip unit (TM-D) combines two protection principles: thermal protection, which operates based on heat generation during overload, and magnetic protection, which responds to high currents via magnetic field. The thermal protection is adjustable to match specific load requirements, while the magnetic protection is fixed to ensure rapid response to sudden short-circuits. The rated short-circuit breaking capacity (Icu) of 100 kA at various voltages demonstrates the breaker’s ability to safely interrupt high short-circuit currents, which is critical for system safety. The rated insulation voltage of 800 V AC and impulse withstand voltage of 8 kV ensure high electrical strength, essential for reliability in industrial environments. The life expectancy figures (mechanical 20,000 cycles, electrical variable) indicate the breaker’s durability under different operating conditions.

Compatibility and Accessories
The ComPacT NSX250HB2 is compatible with a wide range of optional functions and accessories that extend its functionality. These include load current trip units (e.g., LV429387, LV429388), undervoltage trip units (e.g., LV429407, LV429408), rotary actuators (e.g., LV429338T), motor actuators (e.g., LV431541), auxiliary switches (e.g., 29450, 29452), terminal covers (e.g., LV429515, LV429517), plug-in plate sets (e.g., LV429289), front panel display modules (e.g., TRV00121, LV434128), measuring modules (e.g., LV434020), communication modules (e.g., LV434000, LV434001, LV434002, LV434063), and phase barriers (e.g., LV429329). These modules can be inserted into the breaker’s slots according to application needs, enabling functions such as remote control, status indication, measurement, or communication. Compatibility with Schneider Electric’s EcoStruxure Power architecture allows integration into higher-level energy and automation systems.

Installation and Mounting
Mounting is fixed to a back panel, with possible orientations being horizontal, vertical, or inverted. Connections are located on the front side, facilitating easy wiring. The 35 mm mounting pitch conforms to the standard for electrical switchboards and simplifies integration into existing systems. Installation requires no special tools, as fastening is done via standard back panel brackets. The dimensions and weight are designed to fit into standardized switchboards. Installation must be performed by qualified personnel to ensure safety and proper function.

Operational Advantages
The ComPacT NSX250HB2 offers high reliability through its thermomagnetic trip unit and a high breaking capacity of 100 kA. The adjustable thermal protection allows adaptation to different load profiles, while the fixed magnetic protection ensures rapid response to short-circuits. High electrical strength and robust construction ensure long service life and low maintenance. Compatibility with various accessory modules allows flexible expansion of functions without affecting the breaker’s core functionality. Integration into the EcoStruxure Power architecture enables centralized control and monitoring, increasing efficiency and transparency in energy distribution. The IP40 and IK07 protection ratings provide sufficient mechanical and electrical protection for typical industrial environments.