What this MCCB is and what it does
The Siemens 3VA1132-3EF32-0DA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — meaning it guards feeder and distribution circuits against overload and short-circuit faults, not motor or generator protection. It carries a continuous current rating of 32 A at 40 °C, derating to 30 A at 70 °C, so the thermal curve stays flat across most panel ambient conditions. The 3-pole construction handles three-phase systems up to 800 V insulation voltage. Breaking capacity is the headline number here: 75.6 kA at 240 V, 52.5 kA at 415 V, and still 11.9 kA at 690 V. That SCCR headroom means this breaker can be applied upstream in high-fault panels without cascading — it clears a 52.5 kA bolted fault at 415 V without needing a current-limiting fuse ahead of it. For a panel OEM or site electrical engineer, that simplifies selectivity coordination and keeps the upstream transformer sizing honest.
Undervoltage release and auxiliary release design
This variant ships with an undervoltage release (UVR) as the auxiliary release — the design-of-auxiliary-release field confirms it's an undervoltage release (UVR), not a shunt trip. The UVR trips the breaker when supply voltage drops below a set threshold, which is standard for safety circuits where a loss of control voltage should open the main feeder. The basic switch assembly is order code 3VA11323EF320AA0, so if you're panel-building and need the sub-assembly for a replacement, that's the part to cross-reference. No ground-fault monitoring, no communication function, no trip indicator — this is a straightforward thermal-magnetic line protection breaker (TM240 overcurrent release design). The undervoltage release is the only auxiliary, so if your BOM calls for shunt trip or GFCI, this isn't the variant.
Dimensions and panel fit
Physical footprint: 130 mm height, 76.2 mm width, 70 mm depth. That 70 mm depth is the key dimension for enclosure depth planning — it's shallow enough for most 200 mm deep wall-mount enclosures, but verify gland plate clearance if you're back-paneling with a deep bus stack. The 76.2 mm width (3 inches) is standard for a 3-pole MCCB in this frame size, so it fits existing SENTRON 3VA mounting bases without adapters.
Thermal performance and power loss
Maximum power loss is 13.1 W — that's the heat the breaker dissipates at full rated current. In a densely packed panel, that figure feeds the thermal budget for enclosure ventilation or derating of adjacent devices. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C, so it's fine for unheated electrical rooms or outdoor enclosures with solar gain.