MCCB for high-fault line protection
The Siemens SENTRON 3VA2140-6HK32-0AA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, carrying a 40 A continuous current rating across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. Its 600 A frame size and ETU340 electronic overcurrent release give it the headroom to handle high-fault scenarios: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V.
What the ratings mean for your panel
The 242 kA interrupting rating at 240 V means this breaker can safely clear a fault current up to that level without catastrophic failure — critical for high-capacity transformer secondaries or busway taps where available fault current is high. The 187 kA at 415 V and 440 V covers common industrial distribution voltages in Europe and Asia. At 690 V the rating drops to 3.7 kA, so verify the available fault current if you're using it on a 690 V system. The 40 A continuous rating is flat from 40 °C to 70 °C — no thermal derating curve to calculate. That simplifies panel sizing in warm enclosures or near heat sources. The ETU340 release provides adjustable long-time, short-time, and instantaneous protection, plus ground-fault capability (though this variant ships without ground-fault monitoring). Rated insulation voltage is 800 V, so it's suitable for 690 V systems with margin. IP40 on the front means it's protected against tools and solid objects over 1 mm — standard for indoor panel mounting, but not for washdown environments.
Footprint and panel fit
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON panelboards and switchgear without modification. No undervoltage release or communication function on this variant, so wiring is straightforward: line and load connections only.