Static Transfer Switch

The STS uses thyristor module (SCR) as switching device to realize power-free switching between different input power supplies. It is used in the field of demanding high-end uninterruptible power supply( such as computer rooms, Internet data centers, telecommunications, financial data centers, industrial process control centers, etc).

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Technical Features

Adopt 32-bit DSP full digital control technology, 

with the feature of strong anti-interference,

 fast computing speed, high control accuracy,etc. Switching time ≤4ms.

Dual AC power switch, key equipment redundant power supply.

Advanced power failure detection method can quickly determine power failure.

LED indicator + LCD display monitor;

control screen (optional), 

can monitor status information at any time.

         With overheating, overvoltage, overfrequency, 

                 output overcurrent, overload and 

                      other protection functions.

Independent RS485 communication interface supports real-time communication.


Data room, communication room, automatic control system of electric power industry, power supply system of petrochemical industry, etc.

Specification 16A 25A 32A 40A 45A 63A 80A 100A 125A 63A
Capacity 3.5KVA 6.2KVA 7.7KVA 10KVA 11KVA 15KVA 19KVA 24KVA 27.5KVA 45KVA
Phase Single phase Three-phase
AC Input
AC Input Voltage 220Vac (customizable)
Input Voltage Range 190-260Vac 320-440Vac
Automatic Switching of Threshold Voltage 220Vac±15%; 380Vac±12.5%; hysteresis error of instrument ±5V 320-440Vac
Over Limit Protection Shutdown Threshold Voltage ≤165Vac @ ≥260Vac,  hysteresis error of instrument ±5V
Overrun Protection Shutdown Threshold Frequency ≤45Hz & ≥65Hz, hysteresis error of instrument±0.2Hz ≤42.5Hz or ≥57.5Hz,hysteresis error of instrument±0.2Hz
Automatic Switching of Threshold Frequency 50Hz±10%,hysteresis error of instrument±0.2Hz
Frequency 50Hz(±10%)
Overload Capacity
Load current ≤110%, continuou operation;
Load current>110%, shut down immediately;
Load current<105%, continuou operation;
Load current>105%, shutdown after 60ms;
Protection Function Input under-voltage and over-voltage protection, output overload protection, over-temperature protection, short circuit protection;
Switching Parameter
Priority Switch ≤4ms ≤8ms
Switching Poles Single-pole firewire switching (option: bipolar zero firewire switching)
Switching Element Thyristor Controlled (SCR)contactless switching
Switching Mode Break before Make
Switching Condition Power failure or overvoltage or undervoltage
Working Environment
Insulation Strength 2000Vac/10mA/60s
Humidity 0%~ 90%, no condensation
Operating Temperature -10℃~50℃
Storage Temperature -40℃~70℃
Noise (1m) <55dB
Dimensions (mm) 490*343*44(1U) 490*338*88(2U) 490*412*132(3U)
LCD Display (optional) Voltage, frequency, current, load percentage, etc. (LCD model)
Communications Interface RS485

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