At 4 A, this breaker protects a 3-phase load drawing roughly 2.7 kW at 400 V AC (assuming a power factor around 0.8), so size it for the continuous load, not the peak inrush. For UL-listed panels, the same part carries 5 kA per UL 1077 and CSA C22.2 No.235 — the lower figure reflects the different test protocol, not a derating. The 3-pole design switches all three phases together with a single toggle, and the neutral is not switched (no 4-pole option on this frame). The housing is IP20 with conductors connected, so it belongs inside a sealed enclosure — not on the panel face. Three modular width units (54 mm) leave room for auxiliary contacts or shunt trips on the right side; the combined terminal design accepts both busbar and cable at top and bottom without extra adapters.
Halogen-free and silicon-free construction, suitable for clean-room or food-processing environments where outgassing contaminates product or optics. Rated for ambient temperature from -40 °C to +75 °C, with humidity derating above 55 °C (95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C). Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.