Schneider Electric A9N19827

Schneider Electric A9N19827 is a 4-pole Miniatur-Leistungsschalter of the C120H type in the Acti 9 series, primarily designed for power distribution protection.

Grundparameter

Pole Count: 4P, meaning it has 4 protection poles.

Nennstrom: 125A (reference temperature at 30℃).

Trip Curve: Typ C, with magnetic trip limited to 5–10 times the rated current.

Nennspannung: Rated operational voltage is 440V AC, 50/60Hz; rated insulation voltage is 500V AC; rated impulse withstand voltage is 6kV.

Bruchkapazität: At 440V AC, 50/60Hz, the rated ultimate breaking capacity (Icu) is 6kA; at 230–240V AC, 50/60Hz, Icu is 20kA; at 400–415V AC, 50/60Hz, Icu is 10kA.

Product Features

Trip Unit Type: Thermal-magnetic type, integrating both overload long-delay and short-circuit instantaneous protection functions.

Isolationsfunktion: Equipped with isolation function, compliant with IEC 60947-2 Standard.

Montagemethode: DIN rail mounting for ease and efficiency.

Wiring Capacity: Suitable for solid single-core wires (without wire ferrules) ranging from 1–50mm², and flexible wires (with or without wire ferrules optional) ranging from 1.5–35mm². Adopts tunnel-type terminals, supporting both top and bottom wiring.

Abmessungen & Weight: Width 108mm, depth 73mm, height 86mm, and product weight approximately 820g.

Service Life: Mechanical service life of 20,000 Operationen, electrical service life of 5,000 Operationen.

Certifications & Standards: Compliant with standards such as GB 10963.1 und IEC 60898-1, and certified by CCC and CE.

Compared with Siemens equivalent products (mainly corresponding to the 5SP44927 4P 125A Type C heavy-duty miniature circuit breaker), Schneider Electric A9N19827 (a 4P 125A Type C miniature circuit breaker in the Acti9 C120H series) demonstrates distinct advantages in breaking capacity, temperature adaptability, wiring design, accessory ecosystem, Sicherheitsmerkmale, and service life. Below is a structured comparative analysis:

Overview of Core Parameter Comparison

Comparison Item	Schneider A9N19827	Siemens 5SP44927	Schneider’s Advantages
Bruchkapazität	440V und: 6Die	400V und: 10Die	Breaking capacity of up to 20kA at 230–240V AC, far exceeding Siemens’ 10Die, providing more reliable protection against single-phase short circuits
	400–415V AC: 10Die	Lower breaking capacity for other voltage classes
	230–240V AC: 20Die
Reference Temperature for Rated Current	30℃	40℃	More stable rated current under the standard 30℃ environment, with stronger actual current-carrying capacity
Wiring Capacity	Solid single-core wires: 1–50mm²	Solid single-core wires: Max. 50mm²	Supports bidirectional top and bottom wiring, offering higher installation flexibility; clear specification of flexible wire compatibility range
	Flexible wires: 1.5–35mm²	Flexible wires: Not specified
	Tunnel-type terminals, supporting top/bottom wiring	Only front-panel wiring supported
Width Dimension	108mm	70mm	Despite being wider, the internal structure is more robust with better heat dissipation performance
Mechanical Service Life	20,000 Operationen	Etwa 10,000 Operationen	Double the mechanical service life, resulting in lower risk of mechanical failure during long-term use
Electrical Service Life	5,000 Operationen	Etwa 3,000 Operationen	Electrical service life increased by about 67%, reducing replacement frequency and maintenance costs
Insulation Voltage	500V und	440V und	Higher insulation voltage, enhancing resistance to overvoltage and improving safety
Impulse Withstand Voltage	6kV	Approximately 4.5kV	33% higher impulse withstand voltage, providing superior protection against transient overvoltage such as lightning strikes

Detailed Analysis of Key Advantages
Advantages in Breaking Capacity and Protection Performance

Stronger Adaptability to Multiple Voltage Classes: Schneider A9N19827 provides differentiated breaking capacity across various voltage classes. Especially in 230–240V AC single-phase systems, its breaking capacity reaches 20kA, while Siemens 5SP44927 maintains 10kA across all voltage classes.

Optimized Current Limiting Characteristics: Adopting a Type C trip curve (instantaneous trip at 5–10 times the rated current), it offers more precise protection than the 7–10 times trip range of the Siemens 5SP4 series, better matching conventional load protection requirements and reducing the risk of false tripping.

Enhanced Overvoltage Withstand Capability: With a rated impulse withstand voltage of 6kV, higher than that of Siemens products, it delivers greater reliability in lightning-prone areas or industrial environments with high electromagnetic interference.

Advantages in Installation and Wiring Flexibility

Bidirectional Wiring Design: Tunnel-type terminals support both top and bottom wiring, accommodating different distribution box layouts and incoming line directions, whereas the Siemens 5SP4 series only supports front-panel wiring.

Higher Terminal Reliability: The wiring terminals of the Acti9 series can withstand tightening torque twice the national standard value, ensuring more secure cable connections with lower contact resistance and minimizing heat generation risks.

Broader Accessory Compatibility: It is compatible with accessories of the C65 series, enabling easy expansion of functions such as auxiliary contacts, alarm contacts, und Arbeitsstromauslöser. In contrast, the Siemens 5SP4 series has a relatively independent accessory system with fewer optional components.

Advantages in Safety and Reliability

Clear Isolation Indication: A green trip indicator strip physically confirms the contact open state, ensuring maintenance safety and complying with the isolation function requirements of IEC 60947-2.

Quick Closing Mechanism: The speed-independent quick closing design (independent of the operating handle speed) improves mechanical service life and operational reliability, reducing arc damage.

Superior Contamination Resistance: Suitable for pollution degree 3 industrial environments, covering a wider range than the pollution degree 2 rating of the Siemens 5SP4 series.

Advantages in Service Life and Maintenance Cost

20,000 Mechanical Operations: Double that of equivalent Siemens products, lowering the risk of mechanical failure during long-term operation.

5,000 Electrical Operations: A 67% increase compared to Siemens products, reducing replacement frequency and maintenance costs.

Maintenance-Free Design: The thermal-magnetic trip unit requires no periodic calibration, whereas some Siemens products demand regular inspection of trip characteristics.

Advantages in Digital and Intelligent Potential

EcoStruxure Ecosystem Compatibility: It can be seamlessly integrated into Schneider’s intelligent power distribution system, supporting functions such as remote monitoring, fault diagnosis, and energy management.

High-Sensitivity Auxiliary Contacts: Optional auxiliary contacts support currents as low as 2mA, making them suitable for signal acquisition in building automation and industrial control systems.

III. Recommended Application Scenarios

Schneider A9N19827 is particularly suitable for the following scenarios:

Main Incoming Line Protection in Commercial Buildings: The high breaking capacity of 20kA at 230–240V AC delivers more reliable short-circuit protection.
Power Distribution Systems in Industrial Environments: Pollution degree 3 adaptability and 6kV impulse withstand voltage ensure stable operation under harsh working conditions.
Projects Requiring Flexible Wiring: Bidirectional top and bottom wiring design simplifies distribution box layout.
Critical Equipment for Long-Term Operation: Longer mechanical and electrical service life reduces maintenance costs.
Intelligent Power Distribution Systems: Compatibility with the EcoStruxure platform supports future digital upgrades.

With higher breaking capacity, more flexible installation design, longer service life, and stronger safety features, Schneider A9N19827 demonstrates comprehensive advantages over the equivalent Siemens 5SP44927 product. These strengths make it a more reliable choice for commercial and industrial power distribution protection, especially in applications with high requirements for safety and long-term stability.