What the ratings mean for your panel
The Siemens SENTRON 3VA1120-5ED46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection. Its 20 A continuous current carries through the full ambient range from 40 °C to 55 °C without derating; at 60 °C it drops to 19 A, and at 70 °C it holds at 19 A — so a 20 A load in a warm enclosure still has headroom. The TM210 thermal-magnetic release provides fixed thermal and magnetic trip settings, no adjustment needed. Breaking capacity is the real differentiator here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V or 690 V. That 187 kA at 240 V means it can safely interrupt very high fault currents on low-voltage distribution — typical for transformer-fed switchgear where available fault current is high. At 415 V the 121 kA still covers most industrial panelboards. The 17 kA at 690 V is adequate for 690 V drives or mining gear, but not for high-fault 690 V buswork. Rated insulation voltage is 800 V, and max DC operational voltage is 600 V — so it can be used on DC circuits up to that level, though the AC ratings are the primary spec. The front face carries IP40 protection; inside a panel that's fine, but it's not rated for washdown or outdoor exposure without an enclosure.
Lifecycle and sourcing reality
Sourcing is straightforward: we quote it against an RFQ. Volume pricing drops with quantity — typical for the SENTRON family. If you need a motor drive option, the product extension supports it (optional accessory).
Panel integration notes
Dimensions are 70 mm deep, 101.6 mm wide, 130 mm tall — a 4-pole MCCB that fits standard DIN-rail or panel-mount enclosures. The 101.6 mm width (4 inches) is the pole pitch for a 4-pole device; check your enclosure's mounting plate for the bolt pattern. Maximum power loss is 12 W, so ventilation in a sealed cabinet should account for that heat. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses. The IP40 front face means no gasket sealing — fine for a clean panel, but not for dusty or wet locations.