It carries 160 A continuously at 40 °C ambient and provides a maximum breaking capacity of 1 600 A — the 121 kA at 240 V AC is the rating that governs fault clearing on most low-voltage distribution panels.
Rated 160 A at 40 °C, derating to 150 A at 70 °C — the thermal curve is flat up to 50 °C, then drops by roughly 2 A per 5 °C step through 70 °C. The TM210 release combines a thermal bimetal for overload protection and a magnetic coil for short-circuit response; the '210' designator indicates the magnetic trip level, which is fixed and non-adjustable. Breaking capacity is the real selector: 121 kA at 240 V, 76 kA at 415 V, 53 kA at 440 V, and 12 kA at 500 V. On a 480 V panel (common in North America) the 440 V figure of 53 kA is the closest published rating — adequate for most industrial services with a transformer impedance-limited fault current. The 1 600 A maximum rating is the frame limit, not the continuous rating; the actual continuous current is set by the installed trip unit. Power dissipation is 38 W maximum at rated load, which factors into enclosure thermal calculations when stacking multiple breakers.
It protects cables, busbars, and downstream equipment against overload and short-circuit faults. The 3-pole configuration suits three-phase systems (delta or wye, solidly grounded or impedance-grounded).
Listed as current production (active lifecycle stage). No phase-out or last-time-buy notice appears.