The 5SM3647-6KK01: The 80 A rated current and 300 mA residual trip define the load and protection envelope. The 300 mA rating is a deliberate choice for circuits with high leakage from equipment filters or long cable runs — it avoids nuisance tripping that a 30 mA device would cause. The short-time delayed design (type A, short-time delayed) means it withstands surge currents up to 3 kA without tripping, so it coordinates with upstream overcurrent devices and handles inrush from motor drives or UPS systems without dropping the line. Type A detection catches both sinusoidal AC residual currents and pulsating DC fault currents, which covers most modern electronic loads — switched-mode power supplies, variable-speed drives, and rectifier circuits.
Snaps onto DIN rail (REG profile). The screw-type terminals accept solid or stranded conductors from 1.5 mm² up to 25 mm², and the tightening torque range is 2.5 to 3 N·m.