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Medium voltage solid state soft starter device

Medium voltage solid state soft starter device

The Medium voltage solid state soft starter device is a modern high-tech product that is reliable, easy to maintain, and perfect for starting and stopping control and protection of squirrel cage asynchronous synchronous starters. By utilizing multiple thyristors connected in series, this device can meet the current and voltage needs. It is commonly used in power systems with a rated voltage of 3000-10000V in various industries such as building materials, chemicals, metallurgy, steel, and papermaking. This device is an excellent choice for starting and protecting medium-voltage motors in equipment like water pumps, blowers, compressors, mixers, grinders, and other mechanical machinery.

Model:MV soft starter

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Product Description

The Medium voltage solid state soft starter device is an advanced motor starting device that isMedium voltage soft starter is a new intelligent motor starter, it is suitable for squirrel-cage asynchronous and synchronous motors. It is an Integrated motor terminal control equipment for starter, display, Protection, and data collection. Users can achieve more complex control functions by using fewer components. The medium voltage soft starter controls the input voltage through the conduction Angle between the control items in order to change the voltage value at the starter end of a motor, that is, control the starting torque and starting current of the motor to realize the motor soft start control. Medium voltage soft starters can accelerate smoothly according to the set starting parameters, thus reducing the electrical and mechanical impact on the power grid, motor, and equipment. When the motor reaches the rated speed, the bypass contactor is switched on automatically. The medium voltage soft starter continues to monitor the motor after starting and provides various fault protection. Suitable for both squirrel-cage asynchronous and synchronous motors. It integrates motor terminal control functions such as starter, display, protection, and data collection into a single piece of equipment. By using fewer components, users can achieve more complex control capabilities. This soft starter regulates the input voltage by adjusting the conduction angle of the control elements, thereby controlling the starting torque and current of the motor to enable a smooth start. This helps reduce the electrical and mechanical stress on the power grid, motor, and equipment. Once the motor reaches its rated speed, the bypass contactor automatically activates. The medium voltage soft starter also continuously monitors the motor post-startup and offers various fault protection features.

Technical Characteristics of Medium voltage solid state soft starter device

Part composition: Medium voltage SCR component, SCR defense part, optical fiber trigger element, vacuum cleaner button component, signal purchase and defense element, system control, and screen element.

SCR module: SCR components with the same criteria in each phase are set up in collection and parallel.

SCR defense elements: These mostly include the RC network, which is composed of an overvoltage absorption network and made up of the voltage-sharing unit of a voltage-sharing defense network.

Fiber trigger elements: Use a solid trigger pulse circuit to ensure the trigger consistency and reliability, and use a fiber optic trigger to Understand high and low voltage seclusion.

Vacuum switch component: After beginning, the three-phase vacuum cleaner bypass contactor instantly pulls in. The motor is infiltrating the power grid procedure.

Signal acquisition & security parts: the voltage transformer, current transformer, lightning arrester accumulate main circuit voltage, present signal purchase, the primary CPU control, and make matching security.

System control and display components: 32-bit ARM core microcontroller implementation facility control. LCD/touch screen display can show three-phase voltage, Existing, info, running condition, and so on.

The cabinet framework embraces a high voltage switch cupboard body; the main structure embraces a 2mm aluminum-zinc steel plate substance folding procedure. The cupboard door takes on a 2mm cool rolled steel plate substance folding process; the cabinet door adopts an electrostatic splashing procedure, the attributes of act resistance, rust resistance, and gorgeous clearance. The protection class is IP40.

Functional Features of Medium voltage solid state soft starter device

A variety of starting ways;

Starting control: the machine is equipped with local, remote (external dry contact), PLC. Communication (485 interface. Modbus)

signalling control function.

Soft start/direct start with conversion function;

Thyristor protection: resistance and capacitance absorption dynamic and static voltage sharing technology, to ensure the reliable and safe operation of power devices in series under high voltage

Strong anti-interference

Modular design

Communication interface: RS-485 communication interface, embedded standard MODBUS protocol, convenient configuration connection

Analog signal output: 4-20mA signal

Memory of 15 failures

Advanced and perfect start and stop function

High reliability, High security, Practical.

Basic Parameters Sheet

The Load Type

Three-phase medium voltage squirrel cage asynchronous motor, synchronous motor

Rated Voltage


Working Frequency


Phase Sequence

Allowed to work in any phase sequence (phase sequence detection can be set by parameter)

Main Loop Composition

12SCRS、18SCRS、30SCRS(Depending on the model and rated voltage)

Bypass Contactor

Contactor with direct starting capacity

Control Power


Transient voltage overload protection

dv/dt Absorption of protection

Starter per hour

No more than 3 starting times per hour

Environmental conditions

-10℃ -±50℃ relative humidity

5% -95% Without condensation

Capacity reduction is required when the altitude exceeds 1500 meters

Protection Parameters

Open-phase protection

Disconnect any phase of the main power supply during startup or operation

Working overcurrent protection

Run overcurrent protection Settings:20~500%

Phase current imbalance protection

Phase current imbalance protection:0~100%

Overload protection

Overload protection level:10A、10、15、20、25、30

Underload protection

Overload protection level:10A、10、15、20、25、30

Overtime of Starting

limitation of Starting time:0~120S

Phase Sequence Protection

Allows to work in any phase sequence (can be set by parameter)

Ground protection

Protection when grounding current is bigger than the set value

Communication  Description

Communication Agreement

Modbus RTU

Communication Connector


Network Connection

Each RZMV can communicate with 30 RZMV devices on the network


Through the communication interface, you can observe the running status and program

Operation Interface

LCD display (optional contact screen)

LCD liquid crystal display (optional touch screen display)


Chinese , English


6 touch film buttons

Strument Display System

Master Power Supply

Display three-phase main voltage

Three Phase Current

Display three-phase main loop current

Data Record

Error Record

Record the latest15 faults

Starting Times

Record the starting times of the device

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