SENTRON 3VA1020-3ED32-0DA0 — 20 A MCCB with TM210 Release
The Siemens 3VA1020-3ED32-0DA0 is a SENTRON molded case circuit breaker (MCCB) rated for 20 A continuous current at 40 °C, with a 3-pole configuration and a TM210 thermal-magnetic overcurrent release. It is designed for line protection in distribution panels and motor branch circuits where a compact, high-interrupting MCCB is required. The breaker carries a breaking capacity of 75.6 kA at 240 V and 52.5 kA at 415 V, which means it can safely interrupt fault currents up to those levels without upstream cascading — a critical spec for SCCR compliance in industrial control panels.
Key Ratings and What They Mean for Fit
The 20 A rated continuous current (Iu) is the breaker's thermal capacity at 40 °C ambient. At elevated panel temperatures, the rating derates: still 20 A at 50 °C, then 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. For a panel running at 60 °C, the effective continuous load limit is 18.8 A — not 20 A. The TM210 release provides thermal-magnetic protection with a fixed magnetic trip threshold, suitable for cable and busbar protection in line duty. Breaking capacity varies significantly by voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. At 415 V, the 52.5 kA rating covers most industrial distribution scenarios; at 690 V, the 7.5 kA limit means this breaker is not suitable for high-fault 690 V buswork without upstream current-limiting fuses. The rated insulation voltage (Ui) is 800 V, confirming the breaker's internal insulation can withstand that voltage class. The breaker includes an undervoltage release (UVR) as the auxiliary release design, which will trip the breaker if supply voltage drops below a set threshold — useful for preventing motor re-acceleration after a dip. There is no integrated auxiliary contact, no communication function, no phase failure detection, and no ground fault monitoring. The front protection class is IP40, meaning it is protected against tools and small wires but not against water ingress — suitable for indoor panel mounting, not washdown environments.
Integration and Mounting
The breaker measures 76.2 mm wide, 130 mm high, and 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. The 70 mm depth fits within typical 200 mm deep enclosures, leaving room for wiring and busbar connections behind the breaker. The IP40 front protection allows for flush mounting in a panel door with a cutout, provided the rear is enclosed.