SQIC-3000 Intelligent Controller
Microprocessor-based automatic transfer controller for medium and low-voltage power systems, with sequential load switching, intelligent load shedding and Modbus RTU communication.
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Designed around your application.
A microprocessor-based automatic transfer controller designed for medium and low-voltage power systems. It integrates programmable control, current measurement, voltage-sensing wire-break detection, sequential load switching, intelligent load shedding, an LCD display, and Modbus RTU communication over RS485.
The module accurately monitors the three-phase voltages of both incoming power supplies. It detects overvoltage, over/undervoltage, over/underfrequency, phase loss and reverse phase sequence, and provides volt-free contact outputs for switch control. It supports both open and closed-transition transfer, with a closed-transition overlap time of less than 100 ms.
Enhanced source sensing. Measures three-phase voltage and current from both incoming sources.
Coordinated switching. Supports sequential load switching and intelligent load shedding — disconnecting non-critical loads to ensure uninterrupted power supply to critical loads.
Configured transfer. Transfer inhibit, open or closed transition, and selectable auto/manual restoration support site-specific operation.
Event traceability. Stores up to 200 timestamped event records (actuation, operation, warning, fault event) for switching review and fault analysis.
Local and remote operation. 4.3-inch LCD, front-panel controls and Modbus RTU communication support operation and maintenance.
Naming system. SQIC – 3000 – S – CM: 3000 = to control 3 breakers (2000 = to control 2 breakers); S = synch. transfer, close transition; O = open transition; CM = current measurement (blank = without current measurement). Product type: SeQuence Intelligent Controller (SQIC).
Key information
- MonitoringS1 and S2 voltage, current, phase sequence and frequency
- Breaker controlQS1, QTIE and QS2 opening, closing and position feedback
- TransferSelectable open/closed-transition operation
- Operating modesManual/automatic transfer and restoration
- System stabilityConfigured voltage-sensing failure detection
- Integrated I/O12 inputs and 13 outputs (optional 24 inputs and 24 outputs expansion module)
- CommunicationDual isolated RS485 ports, Modbus RTU
- USBParameter setup and firmware updates
- Power supplyPA/PN: 90–305 VAC or 110/220 VDC
- Panel cutout242 × 161 mm
- Overall size260 × 180 × 54 mm
- LanguagesEnglish, Chinese and others (customizable via host computer software)
- Closed-transition overlapLess than 100 ms