The 5SM3442-0LB: This is an instantaneous-trip RCCB (no short-time delay), so it responds immediately to any AC sinusoidal earth fault current above 100 mA.
Mounts on DIN rail (REG) in any position — no orientation restriction. Terminal torque spec is 2.5 to 3 N·m; that's the range for reliable contact without crushing the conductor. Supply can land top or bottom. The screw-type terminals are finger and back-of-hand safe per the protection against electrical shock listing — no live metal exposed when a cover is off. Silicon-free construction matters if this panel shares space with potting or conformal-coating processes — no silicone outgassing to contaminate sensitive surfaces. Ambient operating range is -5 to +45 °C; storage range is wider at -40 to +75 °C, which covers most warehouse and transport conditions.