Thyristor Power Controller

Libratherm Instruments Pvt Ltd (Manufacturer)
Thyristor Power Controller

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Product Profile

Libratherm offers ready-to-use SCR power controller for electrical heating loads ranging from 3 kW/Single phase to 300kW/3-phase. This power pack module comprises suitable triggering card model LTC-12 or LTC-13 or LTC-15, suitably rated back-to-back connected SCR module (with electrically isolated b...

Company Profile

Libratherm is an ISO 9001: 2008 certified Indian Company engaged in the manufacturing activity of Electronic Process Control Instruments since 1991. Product Range includes Digital and Microprocessor based Temperature Indicators / Controllers having different configurations, such as simple ON/OFF, Time Proportional, PID, Programmable Ramp / Soak, Multi-loop PID, Data Loggers with Printer and PC interface, Temperature Scanners, etc...

At Libratherm, the instruments are designed and developed by highly qualified and experienced team of Engineers with in-house Design and Development facilities for both hardware and software. Their products are economically priced, elegant in appearance, reliable and excellent in quality and are conforming to EN61010 international safety standards. Sales and service support is available by dealer's network in the major cities.
Technical Specifications

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Available Ratings

3KW Single phase to 600KW Three phase

Available Configuration

Single phase, Two phase, Three phase (3 or 4 wire star and  3 or 6 wire delta)

Control Action

Phase angle control (self synchronized)

Control Signal

(4-20)mA / (0-5)VDC / (0-10)VDC / Potentiometer


 0 to 230VAC or 0 to 415VAC variable voltage proportional to the control signal.

Smooth Control

Adjustable Ramp Up and Ramp Down Time for soft increase and decrease of output voltage. (Settable in the range of 2 to 20 seconds

Current Control

Using on card Current Limit and Trip settings. (LTC-13 and CLM-15)


For adjusting voltage and current per phase using on card presets

Load Type

Suitable for both resistive and inductive / transformer load

(15A to 500A @ 110/230/415 VAC)

Supply Voltage

120/240/380/415 VAC, 50/60 Hz. (User should specify)

Available Models

 As  given in the above table (Under Model wise description)

Other accessories provided with each power pack

a) Semiconductor fuse per phase – to protect thyristors against short

    circuit condition. RC snubber / MOV across the SCRs to protect

    against transients.

b) Thermal cut out switch on the heat sink – to protect thyristors

    against over heating

c) Cooling fan on heat sinks for thyristors above 50Ampere

d) Heavy duty input/output terminals or Copper Bus bars for supply and heater Connections.

Size (Power Pack)

As per Std. (Sizes can be given on request – based on the model)


Power pack can be mounted on the base plate of the control panel

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