SENTRON 3VA1120-4GE46-0AA0 — 4-pole MCCB, 20 A, line protection
Rated 20 A continuous (Iu) with a TM220 thermal-magnetic release, it carries the full 20 A up to 55 °C ambient, then derates to 19 A at 60–70 °C — a useful margin for warm enclosures or high-density panel layouts. Breaking capacity is voltage-dependent: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Trip unit and adjustability
The TM220 release is a fixed thermal-magnetic type with an adjustable instantaneous magnetic trip — the li max setting goes up to 320 A, letting you dial in short-circuit protection to coordinate with downstream devices. Power loss is 12 W maximum at rated load, which is modest for a 4-pole 20 A frame — panel heat buildup is manageable even in sealed enclosures.
Dimensions are 101.6 mm wide, 130 mm tall, 70 mm deep — a standard 4-pole MCCB footprint that fits most DIN-rail or panel-mount distribution boards. IP40 on the front face protects against tool entry; the rest of the body is open for heat dissipation inside the enclosure. Optional motor drive (product extension) allows remote trip or reset for automated restart sequences.