Libratherm offers single phase zero cross over SCR firing cards for AC single phase operated electrical resistive or inductive loads. This card is basically developed to replace the electro-mechanical contactor with the solid state switch using silicon controlled rectifiers (SCRs). When the electrical load is operated through contactors – the AC cycle is switched ON or OFF at any point of 0 to 180 degree phase angle, this leads to generation of arcing on the contacts and may generate harmonics, which can cause electromagnetic disturbance in the power lines and can also cause malfunctioning of other electronic instruments on the panel. The card featured here eliminates generation of voltage transients because of zero cross over switching technique, also no arcing will be observed during switching operation – since no mechanical contact movement is involved in the solid state device.
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| Power | 100 to 240 VAC |
| Type | Analog |
| Item | Single phase zero cross over SCR firing card |
| Control Input | 3 to 32VDC or potential free contact or 4-20mA or 0-5V/0-10V-user selectable using DIP switch. |
| Number of Inputs | Single and selectable using on card DIP switch. |
| Triggering Pulses | Gate/ Cathode pulses - Optically isolated from the Input-suitable to fire 25A to 500A |
| Number Of Outputs | Single for Back to Back connected SCR . |
| Load Configuration | Single phase with respect to Neutral |
| Supply Voltage | 230VAC +/-10%, 50/60Hz. |
| Output Line Voltage | 40 to 240VAC |
| Mounting | 4 x Screw mounted on the panel surface. |
| Size in mm | 120 x 80 x 50 mm. (H x W x D) |
