The TM240 thermal-magnetic release provides inverse-time overload protection and instantaneous short-circuit trip, a workhorse combination for feeder and distribution circuits where ground-fault monitoring isn't required.
Derating curve and thermal management
Above that, it steps down: 30.72 A at 55 °C, 30.08 A at 60 °C, 29.44 A at 65 °C, and 28.8 A at 70 °C. In a sealed panel or high-ambient enclosure, that 55 °C threshold is the first one to watch — a 4 % derating from nominal means the breaker is still usable for a 30 A continuous load but not a full 32 A feeder. The 15000 mechanical/electrical endurance cycles (latching) suit the breaker for frequent-switching applications like capacitor bank or lighting contactor panels.
Interrupting capacity across voltage tiers
The interrupting capacity drops as system voltage rises: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. For 400 V-class distribution panels common in European and Asian industrial plants, the 75.6 kA figure provides ample headroom for most transformer-fed installations.
Auxiliary contacts and shunt trip — the integrated trip alarm
The integrated auxiliary trip order code 3VA9688-0BL30 is the companion accessory for the shunt trip coil. The trip indicator (mechanical flag) and voltage trigger confirm the breaker state locally.