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Motor Soft Starter SCR Firing Card

For 3 Phase Induction Motor Soft Starter

For 3 Phase Induction Motor Soft Starter

Approx. Rs 15,000 / Unit


To gradually accelerate the speed of AC 3 phase induction motor it is required to feed increasing voltage to the motor and such behaviour is only possible by connecting SCR in series with the motor. The SCRs are controlled by MSST-15 card to generate the firing pulses giving the effect of soft start. Libratherm offers SCR triggering card model MSST-15, which is specially designed for motor soft starter application. This card accepts the start command from a switch contact and generates gate-cathode pulses for 3 pairs of back to back connected SCRs. The user has access to set the starting voltage to create the torque and to set the soft start time. The card takes the feedback from 5A CT to monitor the load current and to generate the trip contact in case of an overload condition. Once the motor achieves full RPM, it is not required to pass the current through the SCRs and hence these SCRs can be bypassed using an external contractor. The bypass command is generated by MSST-15, once the full speed is achieved as indicated by TOR LED.
The user can build motor soft starter just by using the MSST-15 card and suitable ratings of external thyristors, based on the motor capacity.

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Motor Soft Starter

Motor Soft Starter
  • Motor Soft Starter
  • Motor Soft Starter
  • Motor Soft Starter

Approx. Rs 15,000 / Unit


The Motor soft starter MSS-XX for 3 phase induction motor. The user has access to set the starting voltage to create the torque and to set the soft start time. For overload trip, the feedback it was taken from 5A CT to monitor the load current and to generate the trip contact in case of the overload condition. Once the motor achieves full RPM, it is not required to pass the current through the SCRs and hence these SCRs can be bypassed using an external contactor. The bypass command is available in the form of potential free contact, once the full speed is achieved as indicated by TOR LED.

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One Time Regular

How soon do you want this:

Immediate After 1 month

Purpose of Requirement:

Reselling End Use Raw Material

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    Kamlesh Panchal

    (Managing Director)

    Libratherm Instruments Private Limited

    Dahisar East, Mumbai, Maharashtra, India

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