The Siemens 3VA1020-4ED32-0DC0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a 20 A continuous current at 40 °C with a TM210 thermal-magnetic overcurrent release, and delivers 121 kA interrupting capacity at 240 V — enough to handle high-fault utility feeds without cascading upstream. Three-pole design, 800 V rated insulation voltage (Ui), and an IP40 front face for panel-mount applications. The part includes an undervoltage release (UVR) and two auxiliary switches (HQ type) for status feedback to a PLC or safety circuit.
Breaking capacity and thermal derating
Short-circuit ratings drop as system voltage rises: 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That 690 V figure is the one to check if this breaker lands in a 690 V motor control center — it still clears, but the margin shrinks. Thermal current holds flat at 20 A from 40 °C up to 50 °C, then derates linearly to 18 A at 70 °C. If the panel ambient runs hot — say, 55 °C inside a sealed enclosure — the continuous load should not exceed 19.2 A.
Lifecycle and compliance
Operating temperature range -25 °C to 70 °C; storage from -40 °C to 80 °C. The undervoltage release (UVR) is factory-fitted — verify coil voltage against the panel control supply before wiring.
Integration and footprint
Mounts on a standard DIN rail or panel-mount base. Dimensions: 130 mm height, 76.2 mm width (roughly 3 inches — three-pole wide), 70 mm depth. The 70 mm depth fits most 200 mm deep enclosures with room for wiring gutters. Auxiliary contact version is 2 HQ switches — these are changeover contacts rated for low-level signal switching back to a controller input. No communication function or phase-failure detection on this variant; it's a pure thermal-magnetic breaker with remote trip indication via the aux contacts.