What this MCCB carries and where it fits
The Siemens 3VA1080-3ED32-0CH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries 80 A continuously at 40 °C across all three poles, with a slight thermal derating curve: 78 A at 55 °C, 75 A at 65 °C, and 74 A at 70 °C — so in a warm enclosure you lose about 6 A off the nameplate before you hit the 70 °C operating max. The interrupting ratings climb with available fault current: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That SCCR curve tells you this breaker is sized for high-fault industrial panels, not light commercial. The 800 V rated insulation voltage (Ui) confirms the internal clearances and creepage are designed for 690 V line-to-line systems, which is the common upper bound for industrial motor control centers and transformer secondaries. The 21.7 W maximum power loss at rated current matters for thermal coordination inside a sealed panel — that's heat that must be vented or factored into the enclosure's dissipation budget.
Auxiliary complement and undervoltage release
This variant ships with two auxiliary switches plus one trip alarm switch (HQ type), and an integrated undervoltage release (UVR). The UVR trips the breaker when control voltage drops below a set threshold — standard practice for safety disconnects on conveyor lines or pump stations where a loss of control power should open the main circuit. The auxiliary switch complement lets a PLC or DCS read the breaker's open/closed and tripped status without adding external relays.
Panel fit and footprint
The 3VA1080-3ED32-0CH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 76.2 mm width is a standard 3-pole MCCB footprint — it occupies three 25.4 mm (1-inch) module positions on a DIN rail or panel-mount base. If you are swapping into an existing SENTRON or older 3VL cutout, verify the mounting depth: 70 mm leaves clearance for rear-access bus bars or cable ladders behind the breaker.