SENTRON 3VA2110-5KQ42-0AA0 — 100 A 4-Pole MCCB for Line Protection
The Siemens SENTRON 3VA2110-5KQ42-0AA0 is a 4-pole molded case circuit breaker rated for 100 A continuous current, designed specifically for line protection in distribution panels. Its 187 kA breaking capacity at 240 V means it can safely interrupt a fault current up to that level without upstream devices needing to coordinate — a key spec when you're protecting a main feeder or a high-fault bus. The 4-pole configuration covers three-phase plus neutral switching, common in TN-S or TT systems where the neutral needs isolation. Rated insulation voltage is 800 V, giving headroom for 690 V line-to-line systems. The breaker includes a communication function for remote monitoring or integration into a higher-level control system, and ground-fault monitoring via summation current formation on the L+N conductors. Maximum power loss is 10 W — useful to know for thermal management inside a sealed enclosure.
Breaking Capacity Across Voltages — What the Numbers Mean
Breaking capacity drops as voltage rises: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V is typical for an MCCB of this frame size — the arc extinction physics limit how much current can be interrupted at higher voltages. For a 400 V distribution board, the 121 kA figure is well above typical utility fault levels (often 25–50 kA), so this breaker gives generous margin. At 690 V, the 3.7 kA limit means it's not suitable for high-fault industrial 690 V mains; you'd need a larger frame or a current-limiting design.
Thermal Performance — Flat Derating to 70 °C
The 100 A rating holds flat from 40 °C all the way to 70 °C ambient — no derating needed across the normal operating range. That's unusual for an MCCB; many competitors start derating above 40 °C. Storage range is -40 °C to 80 °C, and operating range is -25 °C to 70 °C. The flat thermal curve simplifies panel design: you don't have to oversize the breaker for a warm enclosure or derate for a hot machine room.
Panel Integration — Dimensions and Mounting
Dimensions: 181 mm height, 140 mm width, 86 mm depth. The 140 mm width is the standard 4-pole MCCB footprint for this frame — fits the same mounting holes as other 3VA 4-pole breakers. Depth of 86 mm means it clears most standard enclosure backplates without a sub-panel. Mounting is via screw-clamp to the backplate; no DIN rail for this frame size.
Trip Unit and Adjustment Range
The trip unit is adjustable from 150 A minimum to 1 200 A maximum — that is the magnetic/instantaneous pickup range, not the continuous current. The continuous rating is fixed at 100 A.