What this MCCB does on the line side
With a 121 kA interrupting capacity at 240 V and 75.6 kA at 415 V, it handles high-fault scenarios like transformer secondaries or large busway feeds without needing a current-limiting fuse upstream. The TM240 thermal-magnetic release gives you the fixed thermal pickup and magnetic trip tailored for cable and bus protection rather than motor starting.
Interrupting capacity — what those kA numbers actually mean for coordination
This breaker carries a 121 kA interrupting rating at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V (–). At 240 V, that 121 kA covers almost any North American low-voltage fault — you can land this on a 2500 kVA transformer secondary without worrying about the breaker becoming the weak link.
Thermal derating — 160 A is the baseline, but watch the ambient
At 55 °C it drops to 158 A, at 60 °C to 155 A, at 65 °C to 153 A, and at 70 °C to 150 A (–). If this breaker lands in a non-air-conditioned electrical room or a panel with dense heat dissipation, the 150 A floor at 70 °C still leaves headroom for a 150 A feeder.
Physical fit — dimensions and mounting
That 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this SENTRON frame size — it fits the same panel cutouts and bus-bar spacing as other 160 A SENTRON units.