What this 4-pole MCCB carries
The Siemens SENTRON 3VA1140-6GD42-0AA0 is a molded case circuit breaker (MCCB) for line protection, rated 40 A continuous current (Iu) across a 40 °C to 50 °C ambient — it holds full rating up to 50 °C, then derates to 37 A at 70 °C. Four poles, with 100% neutral protection designed in. The TM210 thermal-magnetic release handles overload and short-circuit trip curves. Interrupting capacity hits 220 kA at 240 V AC and 154 kA at 415 V, dropping to 17 kA at 500 V and 690 V. Rated insulation voltage is 800 V; max DC operational voltage is 600 V.
What the interrupting ratings mean for panel coordination
The 220 kA at 240 V is the headline number, but the real-world selectivity decision lives at 415 V (154 kA) and 440 V (121 kA). If your transformer secondary is 480 V, the 17 kA at 500 V is the figure that governs SCCR — that's still enough for most industrial panelboards, but it means this breaker is not the right choice for a high-fault 690 V bus. The 4-pole form factor with 100% neutral protection suits three-phase loads where the neutral is not switched off — common in North American commercial and industrial panels.