The 18 A AC rated operational current is the continuous thermal rating at 40 °C ambient — size the upstream breaker and conductors for this, not the 25 A peak. The 24.5 A DC rated current tells you the choke can also handle the DC-link ripple current in a 6-pulse rectifier; if your drive's DC bus pulls more than that, step up to the next frame. Thermal class B (130 °C rise over 40 °C ambient) means the winding insulation is standard industrial grade — fine for a ventilated cabinet, but if the panel ambient regularly hits 50 °C you'll need to derate or add forced air. Total power loss is 46 W (39 W copper + 7 W iron core) at full load. That's the heat you need to evacuate from the enclosure — not trivial for a component this size. Mount it with clearance around the core for natural convection; if it's packed between other heat sources, factor the 46 W into your thermal budget.
IP00 open-frame construction — no enclosure, no finger-safe terminals. The screw-type terminals accept standard ring or fork lugs; torque to the manufacturer's spec for the wire gauge you're using. Dimensions: 148 mm wide × 126 mm tall × 78 mm deep.
Designed and tested to EN 61558-2-20, the harmonized standard for small reactors and chokes. Thermal class B per IEC 60085. The 4% voltage drop at rated current is the design impedance — no additional series impedance needed for most 6-pulse drive applications.