What this MCCB carries and where it fits
The Siemens SENTRON 3VA1080-4ED32-0JC0 is a 3-pole molded case circuit breaker rated for 80 A continuous current with a TM210 thermal-magnetic release. The interrupting capacity hits 121 kA at 240 V AC, 75.6 kA at 415 V, and 52.5 kA at 440 V — numbers that govern selectivity and SCCR headroom in a distribution panel. At 690 V it still clears 11.9 kA, so it handles the high-side of a 480 V step-up transformer secondary without cascading upstream. The TM210 release means the thermal element is fixed at 80 A; no interchangeable rating plug, so the BOM line is locked to this frame size. Rated continuous current holds flat at 80 A from 40 °C through 50 °C ambient; above that it derates to 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. If the panel ambient runs above 50 °C, the derating curve is the real selection gate — not the nameplate 80 A. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin. The front face carries IP40 protection — splash-protected, not washdown. Mounting is DIN-rail compatible at 76.2 mm wide (roughly 3 x 25.2 mm per pole), 130 mm tall, and 70 mm deep. That depth is the dimension to check against gland-plate clearance or a shallow enclosure back wall.
Auxiliary and release configuration
This variant ships with two HQ auxiliary switches and a shunt trip (STL) undervoltage release. The shunt trip is wired separately from the main load path — it needs a control voltage to hold the breaker closed; loss of that voltage trips the mechanism. No undervoltage release is fitted, so the shunt trip is the only remote-trip path. The integrated auxiliary trip is order code 3VA9688-0BL32, which is the factory-fitted accessory for this specific build. No communication function, no phase failure detection, no ground fault monitoring — this is a plain line-protection breaker, not a power-monitoring device.
Mechanical endurance and environmental limits
The latching mechanism is rated for 15,000 operations — adequate for a distribution feeder that cycles a few times a year, not for a motor-starting duty where the breaker opens under load weekly. Storage range spans -40 °C to 80 °C; operating ambient is -25 °C to 70 °C. The storage minimum is the handling limit, not the running limit — relevant if the breaker sits in an unheated warehouse before installation.