Its adjustable overload range — 80 A minimum up to 640 A maximum — means it can be set to protect a transformer secondary, a bus riser, or a large motor feeder without swapping the breaker frame. The ETU850 gives you curve shaping (LI, LSI, LSIG via optional modules), so selectivity with downstream breakers is programmable, not guesswork.
Breaking capacity — what the voltage tiers tell you
The interrupting rating changes sharply with system voltage. At 240 V it clears 330 kA symmetrical — enough for a high-capacity transformer secondary. At 500 V the rating drops to 187 kA, and at 690 V it falls to 7.5 kA.
Thermal derating — the real-world current limit
Above 50 °C the current must be derated: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel ambient runs 60 °C, the usable setting is 350 A, not 640 A.
Auxiliary and alarm switch complement
No undervoltage release is fitted; no ground-fault monitoring module is included.
The 3VA2340-7KP32-0AL0 is listed as current-production (active lifecycle). It is part of the Siemens SENTRON 3VA series, which is the current generation replacing the earlier 3VL series. No successor has been announced.
Physical fit — dimensions and panel integration
Dimensions are 248 mm height, 138 mm width, 110 mm depth. It mounts via four screws to a mounting plate or rear panel — no DIN rail. The 110 mm depth includes the rear terminals; allow additional clearance for cable bending radius below the breaker.