The 4-pole configuration handles three-phase plus neutral switching — common for 3-phase distribution where you want to isolate the neutral as well.
Breaking capacity — the real headroom
The headline number is 220 kA at 240 V, which drops to 154 kA at 415 V and 121 kA at 440 V. That means this breaker can be installed upstream of a high-fault transformer or busway without worrying about cascading failure — the SCCR is high enough to let it clear a bolted fault before the arc flash energy climbs. The TM210 overcurrent release is a thermal-magnetic trip unit — thermal for overload protection, magnetic for short-circuit. It's a fixed-trip breaker for straightforward line protection where you don't need selectivity tuning.