Zero Cross Over Turn On - SCR Firing Cards

Libratherm Instruments Pvt Ltd (Manufacturer)
Zero Cross Over Turn On - SCR Firing Cards

Model ID

  • SCRF-3N and LZF-3N

Product Categories

Product Profile

Libratherm offers three-channel SCR firing cards, models SCRF-3N and LZF-3N, for AC single phase and three-phase operated electrical resistive or inductive loads. These cards are basically developed to replace the electro-mechanical contactors with the solid-state switch using silicon controlled rec...

Technical Specifications

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SCR Firing Card with ZERO Cross over turn ON for single phase or  3 phase load


SCRF-3N and LZF-3N

Control Input

 3 to 32VDC or potential  free contact for SCRF-3N

4-20mA/0-5V/0-10V for LZF-3N – user selectable using DIP switch.

No. of Inputs

Common for all 3 outputs or individual for each output.

Each analog input can be selected for 4-20mA/0-5V/0-10V using on card DIP switches.

Triggering Pulses

Gate/ Cathode pulses - Optically isolated from the Input – suitable to fire 25A to 500A back to back connected SCRs.

 G1K1+G2K2 X 3 = 12 pulses.

No. Of  Outputs

 3 independent Back to Back SCR can be triggered.

Load Configuration

1)      3 independent  single phase AC load w.r.t. neutral

2)      3 independent two phase AC load w.r.t. second phase.

3)      Single 3 phase star or delta load.

(Detail wiring diagram is available)

Supply Voltage

100-250VAC, single phase, 50/60Hz.

Output Line Voltage

110VAC/230VAC/415VAC Or any other lower line voltage from step down transformer.


35 mm. DIN rail or can be screw mounted on the panel surface.

Size (H x W x D)

 125  x 185 x 65 mm.

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