What this MCCB is and what it does
The Siemens 3VA1032-3ED32-0DH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for a continuous current Iu of 32 A, with a TM210 thermal-magnetic overcurrent release. It is the line-protection version — meaning it is configured for cable and feeder protection in distribution panels, not motor or generator protection. The part carries an undervoltage release (UVR) as the auxiliary release, plus a 2 auxiliary switch + 1 trip alarm switch HQ contact block for status feedback to a PLC or annunciator. Breaking capacity is voltage-dependent: 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 covers most industrial distribution voltages up to 690 V, with the highest fault-interrupting capability at the lower voltages typical of North American 240/480 V panels. The rated insulation voltage Ui is 800 V, so the breaker is rated for the full 690 V class.
Temperature derating — what the 32 A rating actually means in a warm panel
The 32 A rating holds at ambient temperatures up to 50 °C. Above that, the TM210 release begins to thermally derate: 30.72 A at 55 °C, 30.08 A at 60 °C, 29.44 A at 65 °C, and 28.8 A at 70 °C. If this breaker sits in a crowded enclosure near other heat sources, plan for the derated figure rather than the nameplate 32 A. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Panel fit and mounting
The breaker 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. The front face carries an IP40 protection rating, meaning it is protected against tools and small wires (1 mm diameter and larger) but not against water ingress. Mount it inside a panel with a door; it is not rated for open-wall washdown environments.