Rated working voltage:
AC 400V (50/60Hz) - This is the most commonly used standard voltage.
Higher voltage levels (such as 690V) can be customized.
Rated insulation voltage:
AC 690V or AC 1000V - to ensure the safety margin of internal insulation.
Rated current:
Incoming cabinet/busbar: Usually a wide range, from 630A to 6300A or even higher, depending on the specific design.
Feeder circuit (outgoing cabinet):
Fixed separation: Common circuit currents such as 63A, 100A, 160A, 250A, 400A, 630A.
Drawer type: Common drawer current levels are 100A, 160A, 250A, 400A, 630A (1/2, 1, 2, 3, 4 unit drawers).
Rated short-time withstand current:
Horizontal busbar: Common levels are 50kA (1s), 65kA (1s), 80kA (1s), 100kA (1s), or even higher.
Vertical busbar/functional unit: Usually matches or slightly lower than the horizontal busbar, such as 50kA, 65kA, etc.
This is a key parameter to measure the ability of the cabinet to withstand thermal stress and dynamic stability during a short-circuit fault.
Rated peak withstand current:
Usually about 2.2 times the rated short-time withstand current (for a 50Hz system), for example, corresponding to 50kA Icw, Ipk is about 110kA.
Protection level:
Cabinet: Usually the standard is IP30 (preventing the entry of solid objects with a diameter greater than 2.5mm, not waterproof) or IP31 (proof of vertical dripping).
Internal compartment: Functional units (especially drawer units) usually provide higher protection levels, such as IP20 or IP40.
Higher protection levels (such as IP42, IP54) can be customized for special environments.
Structural form:
Fixed installation: Components are fixedly installed and power must be turned off for maintenance.
Fixed partition: Components are fixedly installed, but there are partitions between functional units to improve safety and isolation.
Drawer type/drawer type: Functional units (circuit breakers, contactors, etc.) are installed in drawer drawers, support hot swapping (main bus power does not need to be disconnected for maintenance and replacement), reliability, availability and maintenance convenience are the highest, which is one of the core advantages of SML.
Smart: This is the core label of the SML series.
Integrated power management system: Built-in or seamlessly integrated with Schneider's PowerLogic™ series instruments, gateways and software (such as EcoStruxure™ Power Monitoring Expert). Provides comprehensive power quality monitoring (voltage, current, power, harmonics, flicker, etc.), energy consumption metering, fault alarm, event recording and other functions.
Condition monitoring: It can monitor the status (opening and closing, energy storage, fault indication), temperature, mechanical characteristics, etc. of key equipment (such as circuit breakers).
Remote monitoring and control: Remote data access, alarm reception and even remote opening and closing operations (authorization and safety design required) are achieved through communication networks (Modbus, Ethernet, Profibus, etc.).
Predictive maintenance: Based on data analysis, predict potential failures, optimize maintenance plans, and reduce unexpected downtime.
Modular design:
Standardized functional units: Standardized fixed partition units or drawer units (1/4, 1/2, 1, 2, 3, 4 unit width) are used to facilitate design, installation, expansion and maintenance.
Flexible busbar system: Horizontal busbar and vertical busbar design facilitates expansion and connection.
Easy to expand: The cabinet structure allows for easy addition of new feeder circuits or renovation and upgrading after initial installation.
High reliability and safety:
Sturdy structure: High-strength aluminum-zinc coated steel plate (or high-quality cold-rolled steel plate) is used, and the surface treatment has strong anti-corrosion ability.
Internal isolation: Strict partitioning (busbar room, functional unit room, cable room) effectively prevents the spread of faults and ensures the safety of operators.
Five-protection interlocking: The drawer-type structure particularly emphasizes the perfect mechanical interlocking (or electromechanical interlocking) to ensure:
Prevent load-on disconnection and closing of disconnectors (plug connectors).
Prevent the circuit breaker from being opened or closed by mistake.
Prevent the circuit breaker from being closed/powered on when the grounding switch is in the closed position.
Prevent the grounding switch from being closed by mistake when the circuit breaker is energized.
Prevent the circuit breaker from being closed by mistake when the circuit breaker is energized.
Prevent the circuit breaker from being entered into the energized compartment by mistake (the disconnector is automatically disconnected when the door is opened).
High short-circuit withstand capability: Optimized structural design and material selection ensure that the circuit breaker can withstand the specified short-circuit current impact.
Temperature rise control: Good ventilation design and busbar connection technology ensure that the long-term operating temperature rise is within the standard range.
Efficient space utilization:
The optimized internal layout and the use of compact components (such as Schneider Compact NSX, Masterpact MTZ circuit breakers) make the SML cabinet more compact and save installation space at the same capacity.
High availability (especially drawer type):
Hot plug: The drawer unit can be withdrawn for maintenance or replacement without powering off the main bus (only the circuit is disconnected), which greatly shortens the power outage time and improves the overall availability of the system. It is especially suitable for key occasions such as data centers, hospitals, and factory continuous production lines.
Easy to install and maintain:
Clear identification, prefabricated cable ducts and cable management space, front wiring design (drawer type), etc., simplify installation and wiring.
Modular design makes fault location and spare parts replacement faster.
Intelligent functions provide maintenance guidance and historical data.
Complete certification:
Complies with major international and regional standards, such as IEC 61439-1/2, GB 7251.1/12 (CCC certification), UL 508A (North American market), etc., to ensure the standardization and safety of design, manufacturing and testing.
Data Center (IDC)
High-end commercial buildings (office buildings, hotels, shopping malls)
Large public facilities (airports, hospitals, schools, stadiums)
Modern factories and industrial parks
Infrastructure (transportation hubs, water services, energy)
Any place with high requirements for power supply continuity, power quality, intelligent management and operation and maintenance efficiency.
