What does the 24 VDC coil with ring cable lug mean for wiring?
The 3RT2026-4XB40-0LA2: The coil is 24 VDC, not AC — so the inrush current profile is flat, no AC hum, and the pickup voltage is held steady by the DC rail. The ring cable lug connection means you terminate with a crimp ring, not a spade or screw-clamp wire; plan for a ring terminal sized to the coil terminal stud. Rated inrush current peak is 3 A, and the pickup time is 30 to 50 ms. The arcing time is 10 ms. That gives you a fast, clean make-and-break on the DC coil side.
What are the DC switching ratings for the main poles?
The 21 A at 480 V is the standout — that's a high DC current for a contactor this size, likely driving a DC motor or resistive load in a 480 VDC bus system.
How does the S0 frame size and mounting work?
Size S0 is the physical frame — 45 mm wide, 91 mm tall, 107 mm deep.
What are the operating limits and endurance?
Maximum switching frequency at AC-1, AC-2, AC-3, and AC-3e is 750 cycles per hour; at AC-4 it drops to 250 cycles per hour due to the higher electrical wear from breaking motor starting current.