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off grid transfer switch sts-0

300 kW On-Grid/Off-Grid Transfer Switch (STS)

Introduction

The 300 kW On-Grid/Off-Grid Transfer Switch (STS) adopts a hybrid topology with a transfer time of less than 15 ms. It supports millisecond-level fault response and integrates grid phase tracking, enabling seamless transitions between grid-connected and off-grid operation in coordination with a PCS. The unit delivers over 99.9% efficiency at full load and features a compact 2U design to save space. Its IP65 protection rating suits demanding environments. Multiple communication interfaces, power-quality analysis, and a mechanical isolation disconnect are integrated. Passive cooling eliminates routine maintenance, ensuring stable and reliable power supply.

Core Advantages

Fast, Seamless Transfer Based on a hybrid design, the transfer time is under 15 ms, enabling millisecond-level fault response and proactive transition to off-grid operation. Integrated grid phase tracking allows smooth, seamless switching between grid-connected and off-grid modes in coordination with a PCS, ensuring uninterrupted power to the load.
High Reliability & Stability With an IP65 protection rating, the unit is suitable for highly polluted and other harsh installation environments. Active arc-suppression technology extends electrical service life and supports all load types. Passive cooling requires no additional maintenance, delivering excellent operational reliability and stability.
High Efficiency & Power Density Conduction loss is close to zero, and efficiency exceeds 99.9% at full load, significantly reducing energy consumption and system operating costs. The compact 2U enclosure saves cabinet space and improves space utilization.
Smart Integration Supports Ethernet, CAN, and RS485 communication protocols for operating and energy-consumption monitoring. Built-in power-quality analysis helps the system manage harmonics. A mechanical isolation disconnect is also integrated, eliminating the need for a separate system contactor and simplifying the overall system architecture.

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