The Siemens 3RV2131-4UA10 is a SIRIUS motor-protective circuit breaker designed for motor protection with an integrated overload relay function. It carries a Class 10 trip characteristic and a breaking capacity of 30 kA at 400 V, meaning it can safely interrupt a fault current up to that level without upstream damage — sized for motor branch circuits in industrial panels.
Mounting and integration
Mounts via screw and snap-on onto a 35 mm standard mounting rail per DIN EN 60715, in any position. Depth is 149 mm, width 75 mm, height 140 mm — fits standard DIN-rail enclosures. Clearance: 50 mm above and below, 10 mm at the side; no forward clearance needed. Main contact terminals accept solid or stranded wire: 2x 1–25 mm² or 1x 1–35 mm², with M6 screws.
Key ratings and what they mean
Breaking capacity varies by voltage: 100 kA at 240 V, 30 kA at 400 V, 5 kA at 500 V, 2 kA at 690 V. The 30 kA at 400 V is the typical industrial mains level — sufficient for most motor branch circuits without requiring a current-limiting upstream device. Phase failure detection is built in; ground fault detection is not. Maximum switching frequency in AC-3 duty is 15 operations per hour.