Satronix manufactures single phase and three phase proportional controller for 3-phase heaters. The Satronix single phase and three phase proportional controller is pre-installed on an engineered heatsink, resulting in the optimum thermal transfer in the minimum amount of panel space. The precise linear control results in improving heater life and reduces electrical noise to adjacent products. The max surge survival technology includes a triple layer protection against damage from voltage surges. It electrically switches 2/3 poles up to 660 Vrms. The DCB (direct copper bonding) technology and the thermally optimised heat sink design results in a high efficiency thyristorised controller. The company offers a comprehensive range of solid state relays featuring direct copper bonding technology for increased life and reliability. The analog switching relay works in accordance with the phase angle control principle, i.e., the output switching point in the AC sine wave depends on control current/control voltage. 4 mA/1 V corresponds to 0% (no switching) and 20 mA/5 V corresponds to 100% (full sine wave). Models available: input – 1 V DC-5 V DC/4 mA-20 mA; output –0%-100%; single phase – 10 to 205 A; and three phase – 10 to 205 A per phase.