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SMM5-630L/3
KCISE
SMM5-630L/3
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The SMM5-630L is a highly reliable 3P 630A Leakage Molded-Case Circuit Breaker (MCCB) designed to deliver comprehensive electrical protection for modern low-voltage power distribution networks. Operating efficiently at a rated voltage of AC 400V (50/60Hz) and supporting rated currents of 400A and 630A, this breaker is an essential component for safeguarding both industrial facilities and large-scale commercial power systems. It integrates advanced leakage protection with robust overload, short-circuit, and ground fault defense mechanisms, significantly reducing the risk of electrical fires and equipment damage. By fully complying with the stringent requirements of international standard IEC 60947-2 and national standard GB/T 14048.2, the SMM5-630L ensures compliance for global project installations, offering procurement teams and electrical engineers a dependable solution for critical infrastructure protection.
Equipped with a highly sensitive residual current detection module, the SMM5-630L is engineered to instantly identify abnormal leakage currents ranging from 25mA to 1000mA. Upon detecting an insulation failure or ground fault, the breaker automatically initiates a trip within 0.01 to 2 seconds. This rapid response is crucial for preventing electric shock incidents and mitigating fire hazards in complex industrial environments, ensuring maximum safety for both personnel and connected machinery.
Designed to handle severe electrical faults, this MCCB features a limit short-circuit breaking capacity (Icu) of 65kA. During a short-circuit event, the breaker swiftly isolates the fault current, preventing thermal and mechanical stress from damaging downstream wires, motors, and sensitive control equipment. Its optimized arc-extinguishing chamber ensures rapid arc quenching, which minimizes energy loss, reduces contact wear, and extends the overall operational lifespan of the breaker.
The SMM5-630L is built to maintain stable protection performance across a broad range of ambient conditions. It operates reliably in temperatures ranging from -5℃ to 40℃ (with a 24-hour average not exceeding 35℃). Calibrated at a standard reference temperature of 40℃, it provides consistent and accurate tripping characteristics without the need for immediate derating, making it highly suitable for unconditioned industrial plants and outdoor switchgear applications.
Space efficiency is a critical factor in modern panel design. The SMM5-630L features a compact footprint (e.g., 140×43.5×184.8mm for the 400A configuration) that significantly saves valuable cabinet space, allowing for higher density installations. Furthermore, its modular architecture facilitates the easy integration of standard accessories, such as auxiliary contacts, alarm contacts, shunt trips, and undervoltage releases, enabling engineers to customize the protection scheme to meet specific project requirements.
To streamline routine maintenance and emergency troubleshooting, the breaker is designed with a clearly positioned operating handle that instantly reflects the "ON", "OFF", or "TRIP" status. Built-in visual indicators for overload, pre-alarm, and specific leakage faults empower maintenance personnel to quickly diagnose the root cause of power interruptions, thereby reducing system downtime and improving overall facility productivity.
We understand that accurate component selection is vital for system stability. Our technical engineering team provides personalized consultation, analyzing your specific load characteristics and application environments to recommend the optimal SMM5-630L configuration. Supported by robust inventory management, we ensure a fast delivery timeline of 3-7 days for standard models, helping contractors and procurement managers keep their projects strictly on schedule.
Our commitment to long-term reliability extends well beyond the initial purchase. We provide comprehensive after-sales support, including detailed installation guidance, remote online fault troubleshooting, and a standard 12-month warranty. For urgent maintenance needs, replacement parts are dispatched within 48 hours. Additionally, we offer tailor-made accessory solutions, such as motorized operating mechanisms, to seamlessly integrate the breaker into automated control systems.
Yes, the breaker is designed for versatile mounting orientations. It fully supports both vertical and horizontal installation without compromising its tripping accuracy or arc-extinguishing capabilities, providing panel builders with maximum flexibility for different switchgear cabinet layouts.
The residual current detection is adjustable between 25mA and 1000mA. This wide adjustability allows the breaker to be precisely tuned for various applications, ranging from highly sensitive protection for personnel in commercial buildings to robust equipment protection for heavy industrial motors.
Absolutely. The SMM5-630L is manufactured and tested in strict accordance with IEC 60947-2 standards. This compliance ensures that the breaker meets the rigorous safety, performance, and quality requirements necessary for integration into power systems destined for the European Union and other international markets.
Yes, it is highly suitable for motor protection. The breaker features an overload long-delay inverse-time characteristic that is specifically designed to accommodate the high inrush currents typical during motor startup, making it an ideal choice for the protection of infrequently started industrial motors.
The reliable operation of the 3P 630A Leakage Molded-Case Breaker depends on specific external environmental conditions. Adhering to these working environment requirements ensures optimal electrical performance, accurate tripping characteristics, and long-term stability in industrial and commercial power distribution systems.
◎ Ambient Air Temperature
Maintaining the breaker within the specified temperature range is crucial to prevent thermal degradation of insulation materials and ensure the accuracy of the tripping mechanism.
a) The upper limit value shall not exceed +40 ℃.
b) The lower limit value shall not be lower than -5 ℃.
c) The average value of 24h shall not exceed +35 ℃.
◎ Altitude
The altitude of the installation site shall not exceed 2000m. Operating within this elevation limit ensures that the dielectric strength and cooling efficiency of the surrounding air remain within the designed safety margins for IEC 60947-2 compliance.
◎ Atmospheric Conditions & Relative Humidity
The relative humidity of the atmosphere shall not exceed 50% at the maximum ambient temperature of +40 ℃. It can have higher relative humidity at lower temperatures. When the monthly average minimum temperature of the wettest month is +25 ℃, the monthly average maximum relative humidity of that month is 90%. Proper precautions should be taken, taking into account the condensation on the product surface due to temperature changes, to ensure the insulation integrity of the leakage breaker.
◎ Class of Pollution
The general pollution level for the operating environment is Class 3, making it suitable for typical industrial environments. The pollution level of accessories installed in the circuit breaker is Class 2.
◎ Installation Category
The main circuit of the circuit breaker shall be installation category III (distribution circuit level), designed to handle significant transient overvoltages. The auxiliary circuit and control circuit shall be installation category II.
◎ Installation Conditions
The circuit breaker shall generally be installed vertically to ensure proper operation of internal mechanical linkages, and the upper incoming line is usually adopted. Furthermore, the external magnetic field of the installation site shall not exceed 5 times of the geomagnetic field in any direction to prevent interference with the leakage detection components.
The following table details the main technical performance indexes for the 3P leakage molded-case circuit breakers, covering frame sizes from 100A to 800A. Designed in strict compliance with IEC 60947-2 standards, these parameters—including breaking capacity, rated insulation voltage, and operational life—provide electrical engineers and procurement professionals with the precise specifications required for accurate project selection and reliable system integration.
Model | 100 | 250 | 400 | 630 | 800 | ||||||
Frame current Inm (A) | 100 | 250 | 400 | 630 | 800 | ||||||
Breaking capacity level | M | H | M | H | M | H | M | H | M | H | |
Rated current In (A) | 32 (12~32) 100 (40~100) | 250 (90~250) | 400 (160~400) | 630 (252~630) | 800 (320~800) | ||||||
Poles | 3, 4 | ||||||||||
Rated insulation voltage Ui (V) | 800 | ||||||||||
Rated operational voltage Ue (V) | 400 | ||||||||||
Rated impulse withstand voltage Uimp (V) | 8000 | ||||||||||
Ultimate short-circuit breaking capacity Icu (kA) | 50 | 65 | 50 | 65 | 65 | 80 | 65 | 85 | 65 | 85 | |
Service short-circuit breaking capacity Ics (kA) | 25 | 50 | 25 | 50 | 32.5 | 55 | 65 | 85 | 65 | 85 | |
Rated short-time withstand current Icw (kA/s) | 5 / 0.5 | 5 / 0.5 | 5 / 0.5 | 20 / 1 | 20 / 1 | ||||||
Utilization category | A | A | B | B | B | ||||||
Arcing distance (mm) | ≯ 50 | ≯ 100 | |||||||||
Operating performance | Electrical life (operations) | 1500 | 1000 | 1000 | 1000 | 500 | |||||
Mechanical life (operations) | 8500 | 7000 | 4000 | 4000 | 2500 | ||||||
The 3P 630A Leakage Molded-Case Breaker is engineered with comprehensive release characteristics to ensure reliable circuit protection and full compliance with IEC 60947-2 standards. It is equipped with advanced and highly responsive protection functions, including overload long delay inverse time limit, short-circuit short delay inverse time limit, short-circuit short delay fixed time limit, and short-circuit instantaneous action.
These adaptable features can be easily configured by the user to form precise reverse protection characteristics based on specific project requirements. By offering customizable tripping profiles, this molded-case circuit breaker ensures optimal safety, minimizes the risk of electrical faults, and supports the stable, long-term operation of industrial and commercial power distribution systems.
The diagram below illustrates the precise leakage action characteristics, providing essential reference data for electrical engineers to evaluate fault response times and ensure reliable earth leakage protection.
The following curve details the tripping behavior specifically for the 63-250 models, serving as a critical resource for procurement specialists and system designers during component selection and electrical network planning.
The following technical diagrams provide comprehensive exterior dimensions and performance characteristic curves for the Leakage Molded-Case Breaker series. These detailed drawings are provided to assist engineers and procurement specialists with precise panel mounting, spatial planning, and system integration for different frame sizes, ensuring IEC 60947-2 compliance during installation.
Exterior Dimensions for 63-250 Frame Size
Exterior Dimensions for 400-800 Frame Size
Exterior Dimensions for 400-800 Leakage Type
Circuit Breaker Characteristic Curve for 400-800 Series
Leakage Action Characteristic Diagram
