The Siemens SENTRON 3VA2125-8HK46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 25 A continuous current across the full ambient range from 40 °C to 70 °C. It carries an interrupting capacity of 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 53 kA at 690 V — figures that place it in the high-interrupting class for line protection in distribution panels and motor control centers.
Trip unit and protection
The ETU340 electronic overcurrent release provides adjustable N-conductor protection (OFF or 100% setting) and a fixed time delay tr of 1300 ms. This is a line-protection version — no ground-fault monitoring, no communication function. The 800 V rated insulation voltage (Ui) suits it for 690 V systems with margin.
Physical integration
Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a standard 4-pole MCCB footprint for panel mounting. IP40 on the front face is typical for enclosed distribution boards; the unit is not rated for washdown or outdoor exposure without an additional enclosure. Mechanical endurance is rated at 20,000 operations.