What this 4-pole MCCB delivers
The Siemens SENTRON 3VA1120-5EE46-0AA0 is a 4-pole molded case circuit breaker rated at 20 A continuous current (Iu) with a TM220 thermal-magnetic release. Its interrupting capacity hits 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V — numbers that put it in the high-fault category for industrial distribution panels where available short-circuit current is substantial. The 4-pole configuration covers three-phase plus neutral, so it suits TN or TT systems where the neutral needs overcurrent protection. The TM220 release means the thermal element is fixed at 20 A (no adjustment band), while the magnetic short-circuit pickup is adjustable up to 320 A (li max.). That gives you some tuning for inrush without changing the breaker — useful on motor or transformer feeders where the starting surge exceeds the continuous rating but the cable still needs the 20 A thermal protection.
Sourcing and lifecycle — current production, no LTB signal
This breaker is in the current lifecycle stage — no end-of-life or last-time-buy notice. It remains a standard catalog item in the SENTRON 3VA family. For a BOM freeze or a line-down replacement, the part is sourced to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
Panel fit — dimensions and integration
The 3VA1120-5EE46-0AA0 measures 70 mm deep, 101.6 mm wide, and 130 mm tall. That 101.6 mm width (4 inches) is a standard 4-pole MCCB footprint — it occupies four 25 mm module positions on a DIN rail or a direct-mount backplate. The IP40 front protection means it is splash-safe from the front but not sealed; mount it inside a panel that provides the overall enclosure rating.
What the ratings mean for your circuit
The 800 V rated insulation voltage (Ui) gives headroom for 690 V systems — the 17 kA breaking capacity at 690 V confirms it can clear faults on 690 V line-to-line circuits, though that is a derated capability compared to the 187 kA at 240 V. The 600 V DC maximum operational voltage (Ue with DC) means it can also serve as a DC switch/disconnect in battery or rectifier circuits up to that voltage, provided the DC current and time constant stay within the manufacturer's DC derating curves. Thermal derating is minimal across the operating range: the breaker holds 20 A from 45 °C through 55 °C, then drops only 1 A at 60 °C and stays at 19 A through 70 °C. That flat curve simplifies panel design — no need to oversize for a warm cabinet unless ambient exceeds 70 °C.