Three poles, with a maximum interrupt rating of 1 500 A and a minimum setting of 300 A, giving you a wide adjustment band for motor FLA matching. The interrupting capacity tells the real story: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 690 V number drops hard because the arc extinction physics change at higher voltage — it's still a valid rating, but you're buying this for the 240-500 V range where it earns its keep.
Built-in auxiliary and release options
That's four discrete signal outputs from one breaker: two for status (open/closed), one for trip event, one for electrical alarm. The UVR means the breaker drops out if control voltage falls below threshold, which is standard for safety circuits where a loss of control power should kill the motor. The trip indicator gives a visual flag when it's tripped on fault, which speeds troubleshooting on a line.