What this MCCB is and what it protects
The Siemens 3VA1080-2ED32-0BH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — meaning its primary job is to protect cables and busbars from overloads and short circuits, not motor starting duty. It carries an 80 A continuous current rating at 40 °C, and the thermal derating curve is documented: 80 A holds through 50 °C, then drops to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. That matters if this breaker lives in a warm enclosure or next to other heat-generating devices — you need to stay on the curve, not the nameplate.
Breaking capacity — what it interrupts at each voltage level
Short-circuit breaking capacity varies with system voltage, and this breaker's ratings are given per the evidence: 52.5 kA at 240 V AC, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 480 V panel, the relevant figure is the 440 V rating (13.6 kA) — conservative but within the standard tolerance for a 480/277 V system. The rated insulation voltage is 800 V, so the breaker's internal clearances are sized for that ceiling.
Built-in auxiliaries and releases
This variant ships with an undervoltage release (UVR) and a 2-auxiliary-switch plus 1-trip-alarm-switch configuration (designation HQ). The UVR trips the breaker when control voltage drops below a threshold — standard for safety circuits where loss of control power must open the main contacts. The auxiliary switches provide status feedback (open/closed) and the trip alarm signals a fault condition separately, which is useful for remote annunciation without adding external relays.
Physical fit and panel integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. That 70 mm depth is the dimension from the mounting surface to the front of the breaker — important when planning gland-plate clearance or door clearance in a shallow enclosure. Three-pole construction, no communication module, no ground-fault monitoring. The breaker is designed for DIN-rail or screw-mount panel integration typical of SENTRON MCCBs.