Products-GoLead Intelligent

SID-40A

Backup Power Seamless Transfer Device

SID‑40A Backup Power Seamless Transfer Device is a high‑reliability automatic transfer controller designed for backup power switching. It supports various standard transfer schemes and switch configurations, enabling millisecond-level fast transfer to ensure uninterrupted power supply to critical loads.

The device offers advanced intelligent functions such as fault detection and locking, healthy-phase verification, and voltage sag ride‑through monitoring, making it adaptable to a wide range of complex power distribution scenarios. It supports multiple transfer modes, including parallel, series, and semi-automatic, with built-in transfer initiation criteria and closing logic, improving the success rate of backup source activation.

Engineered with anti-vibration and electromagnetic immunity, SID‑40A supports mainstream communication protocols such as IEC 61850 and Modbus, and is well-suited for high-demand applications in petrochemical, rail transit, and power utility industries.

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Main Functions

(1)
Supports 5 default automatic transfer schemes and typical 5-switch transfer combinations
(2)
Actively detects internal faults in the supply bus and blocks transfer logic accordingly
(3)
Multiple independently enabled and configurable switching criteria ensure fast and safe backup power engagement across different load types
(4)
Supports various switching configurations including parallel, series, simultaneous, and semi-automatic parallel transfer
(5)
Automatically selects a healthy bus phase during abnormal grid events to ensure reliable transfer success
(6)
Monitors undervoltage conditions and enables rapid return to backup source when brownouts occur
(7)
Supports various initiation methods such as manual normal transfer, abnormal condition transfer, and fault transfer modes
(8)
Enables coordinated and sequential actions across multiple units through fast transfer networking
(9)
Measures and records breaker closing time for performance analysis and optimization
(10)
Provides five analog startup criteria for abnormal conditions with flexible and independent enabling/disabling
(11)
Includes sectionalized low-voltage load shedding and fast auto-decoupling during loop closing operations
(12)
Features such as undervoltage, PT disconnection, phase sequence detection, and post-initiation acceleration alarms
(13)
Offers five composite switching criteria: fast transfer, voltage withstand, synchronization capture, residual voltage, and long-delay transfer
(14)
Stores extensive event logs and SOE data; supports export and waveform analysis via upper computer software
(15)
Supports B-code time synchronization, and standard protocols including Modbus, IEC 61850, and IEC 60870-5-103

KEY Features

SPECIFICATIONS