The Schneider SSM3A325F7 is a three-phase solid state relay from the Harmony SSM3 series, rated for 25 A continuous load per phase at 48-600 V AC. Zero-voltage switching gates the load near the line zero crossing, minimizing inrush on resistive or lightly inductive loads. Control circuit accepts 90-140 V AC, drawing 15-19 mA. Off-state DV/dt is rated at 500 V/µs at maximum output voltage, giving solid transient immunity against switching noise on the line.
Key electrical ratings
Surge withstand: 286 A for 20 ms at 50 Hz, 300 A for 16.6 ms at 60 Hz. Corresponding I²t for fusing: 410 A²·s at 50 Hz, 374 A²·s at 60 Hz. Dielectric strength 4 kV AC between input/output and to case. Insulation resistance 1000 MΩ. On-state voltage drop under 1.35 V, off-state leakage max 0.25 mA. Maximum capacitance input/output 8 pF.
Installation note
Mounts on symmetrical DIN rail. Input terminals accept 0.2–1.3 mm² (AWG 24–16); output terminals accept 1.3–5.3 mm² (AWG 16–10). Tightening torque 0.6–0.7 N·m on input, 1.36–1.7 N·m on output. Green LED shows input status. IP20 enclosure. Ambient storage -40 to 100 °C.