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...

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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