Rated for the wet well — what the 100 A and 75.6 kA actually mean
The Siemens SENTRON 3VA1010-3ED32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release. That 100 A holds flat through 50 °C — only starts to derate at 55 °C (96 A), 60 °C (94 A), 65 °C (92 A), and 70 °C (90 A). In a non-climate-controlled pump station panel that hits 55 °C in summer, you still get 96 A of headroom; no need to oversize the frame. Breaking capacity is where this MCCB earns its place in a feeder: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. That 52.5 kA at 415 V covers most North American 480Y/277 V and international 400 V distribution panels without needing a current-limiting upstream fuse. For a 690 V drive input, the 7.5 kA figure still clears most transformer-secondary faults, but verify your available fault current against that number.
Undervoltage release — why it matters for a lift station
This variant ships with an undervoltage release (UVR) factory-integrated — order code suffix -0CA0 flags that. When line voltage drops below the dropout threshold, the UVR trips the breaker open; it won't reclose until voltage restores and you manually reset. In a wastewater lift station, that prevents automatic restart after a brownout that could hammer pumps back online against a closed discharge valve or a flooded wet well. The UVR is wired separately from the main power path, so it stays functional even if one phase is lost.
Panel fit — dimensions and IP40 front
Footprint is 76.2 mm wide (roughly 3 inches — fits a standard 3-pole MCCB slot in most distribution panels), 130 mm tall, 70 mm deep. Front face carries IP40 protection — fine for a dry indoor panel; not rated for washdown. The 70 mm depth means it clears most 200 mm deep enclosures with room for rear bus bars or wiring gutters.
What the TM210 release tells you
The TM210 is a thermal-magnetic release — thermal element handles overload protection (inverse-time curve), magnetic element handles short-circuit (instantaneous). The '210' designation means the magnetic pickup is fixed at 10× In (1000 A for this 100 A frame). That's a standard motor-circuit pickup; for feeder applications where you need higher short-circuit withstand before the upstream device clears, the 10× In setting is typical. No electronic adjustment or communication — this is a straightforward thermal-magnetic breaker, not a power metering device.