SENTRON 3VA2 40 A MCCB — ETU550, 4-Pole, Full-Range SCCR
The Siemens 3VA2040-7JP46-0AA0 is a SENTRON-series molded case circuit breaker (MCCB) with 4 poles, rated for 40 A continuous current (Iu) with no derating across the full operating temperature range from -40 °C to 70 °C. The interrupting capacity tops out at 330 kA at 240 V AC, stepping down to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3 kA at 690 V — these SCCR figures govern where this breaker can be applied without cascading upstream protection. The ETU550 electronic trip unit provides adjustable long-time delay (tr) from 0.5 s to 25 s and adjustable N-conductor protection (OFF, 40%, 160%).
SCCR and Selectivity Coordination
The 330 kA SCCR at 240 V positions this breaker for high-fault installations — utility-grade service entrances or large transformer secondaries where available fault current is substantial. At 415/440 V the 242 kA rating still covers most industrial distribution panels. The 3 kA at 690 V is a sharp drop: this is the limit for 690 V applications, so verify the available fault current at that voltage level. The ETU550 release supports full selectivity with downstream breakers via the adjustable tr and I²t curves.
Panel Integration and Dimensions
Dimensions are 140 mm wide, 181 mm high, 86 mm deep — a 4-pole MCCB footprint that fits standard SENTRON mounting plates and panel cutouts. Front IP40 protection covers the operator interface; the ETU550 includes communication functionality for integration into higher-level monitoring systems. The 4-pole construction with adjustable N-conductor protection makes it suitable for 3-phase + neutral distribution where neutral protection must be configured per the system grounding scheme.