Automatic Power Transfer System
The MDS9 Series Automatic Power Transfer System (APTS) is specially developed for multi-power supply systems, enabling transfer control and stable power protection. It supports CB-class transfer with short-circuit and overload protection capabilities. Its actuators deliver solutions for low-voltage transfer scenarios. The GridPro series switches integrate real-time detection of the operating temperature at key positions of the main circuit, contact wear analysis, and real-time monitoring of switch state parameters. These status data can also be transmitted to the ME-iPOWER system, enabling multi-dimensional monitoring of the overall transfer system. The APTS Automatic Power Transfer System incorporates multiple redundancy and interlocking functions to ensure the system operates smoothly, including system logic interlocking, electrical interlocking, and flexible or rigid mechanical interlocking of execution units. Depending on different application requirements, the APTS Automatic Power Transfer System can implement various incoming line schemes, such as traditional dual-power transfer, “two incoming feeders & one bus coupler” transfer, and three-power transfer.
Configurations
MDS9AS – Standard Type Transfer
Suitable for general and hybrid load applications.
MDS9AC – Instantaneous Parallel (Closed Transition) Transfer
Suitable for critical loads, commonly used in utility-generator switching scenarios. Supports 100ms parallel operation between two power sources.
Controllers (See MC800 Controller for full details)
MC800-2 – Dual Power System
Supports standard and parallel transfer for two-source systems.
MC800-5 – Dual-Incoming with Bus Coupler System
Supports standard and parallel transfer for two-incoming-one-bus systems.
MC800-3 – Three Power Source System
Supports standard and parallel transfer for three-source systems.
Features & Advantages
Load category: AC-33A, suitable for mixed loads
Withdrawable structure for easier maintenance and inspection
Standard electrical interlock, with optional flexible or rigid mechanical interlock
Excellent short-time withstand current and breaking capacity
Multiple working modes: Auto/Auto Return, Mutual Standby, Auto/Manual Return, Manual, Remote, Test
Multiple operation modes: Automatic, Electric, Manual Mechanical Transfer
Multiple transfer modes: Smooth Transfer, Synchronized Transfer, Residual Voltage Transfer
Real-time temperature monitoring of key main circuit components
Contact wear analysis
Flexible load management capabilities, including transformer energy usage management
Real-time controller self-diagnostic function
Full power parameter monitoring
Remote communication and control supported via RS485 (Modbus RTU)
Generator start/stop function
Multiple parameters can be configured on-site
Technical Specifications / Certifications
Temperature rise test in accordance with GB/T 14048.11-2016 after making/breaking and short-circuit testing
Certified to GB/T 14048.11-2016
Controller certified to CQC1127-2017 (for automatic transfer switch controllers)
Complies with IEC 60947-6-1, IEC 60947-1 / GB 14048.1, IEC 60947-2 / GB 14048.2
1000ms short-time withstand capability
Manufactured in ISO9001-certified facilities
Product Range
Rated current: 200A to 6300A
Rated voltage: 120V to 600V
Poles: 3-pole / 4-pole
Frequency: 50Hz / 60Hz
Applicable configurations:
Utility–Utility
Utility–Generator
Generator–Generator
Utility–Utility–Generator
Utility–Generator–Generator
