SSR1200480A90 is a Series S solid-state relay manufactured by Teledyne Relays, designed for AC/DC control applications with single output capability up to 125A at 660 Vac. This relay features 480 Vac nominal line voltage (24–520 Vrms operating range), AC control with zero-cross turn-on (type A), and a 25A output current rating. The device operates with an input control range of 90–240 Vac/Vdc, input current of 3–8 mA, and exhibits an on-state voltage drop of 1.2 V at rated current. The relay provides zero-cross switching at ±12 Vac window, turn-on time of 24.9 ms, and turn-off time of 24.9 ms at 60 Hz, with off-state leakage current of 3 mA. Thermal characteristics include a maximum surge current rating of 230 A (non-repetitive) and thermal resistance ranging from 0.3°C/W to 2.2°C/W depending on load conditions. This relay is ideal for industrial control, motor switching, heating element control, and other AC load applications requiring reliable zero-cross switching and high current capacity.