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...

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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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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