The DPE40BD: The 40 A rated operational current (Ie) is at the AC-1 utilisation category — that's your resistive load curve. For motor loads (AC-3), the part is sized for 25 HP at 480 V AC, which lines up with a typical 30–40 A full-load current on a 3-phase induction motor. The 3 NO main poles and 1 NO auxiliary contact give you a straightforward switching setup for non-reversing starters. Rated insulation voltage (Ui) is 690 V on the power circuit per IEC 60947-4-1, and 600 V per cUL. Impulse withstand (Uimp) is 6 kV. That means it'll handle typical 480 V panels with room for transient spikes. IP20 on the front face keeps fingers out but doesn't seal against water — mount it inside a cabinet if there's washdown or condensation.
Mounts on a rail or plate. The power circuit screw terminals accept 2.5 to 25 mm² flexible or solid wire (with or without cable end). Control circuit terminals take 1 to 4 mm². Tightening torque is 7 N·m for the larger power connection, 5 N·m for the smaller, and 1.7 N·m on the control side. Use a 4 mm hex or a No 2 Pozidriv for the power terminals. Dimensions are 4.8 in (122 mm) deep, 2.2 in (55 mm) wide, and 4.8 in (122 mm) tall — a compact footprint that fits a standard 4-inch deep enclosure.