Siemens SENTRON 3VA1220-5EF42-0HC0 — 200 A MCCB for Line Protection
The Siemens SENTRON 3VA1220-5EF42-0HC0 is a 4-pole molded case circuit breaker (MCCB) rated for 200 A continuous current at 40 °C, designed specifically for line protection in distribution panels. Its 187 kA interrupting capacity at 240 VAC gives substantial fault-clearing headroom for high-available-fault-current service entrances or sub-distribution boards, while the 121 kA at 415 V and 75.6 kA at 440 V cover industrial 400 V-class networks. The breaker carries a shunt trip (STL) release and two auxiliary switches HQ, so it integrates into remote-trip or status-monitoring circuits without an add-on module.
Current Rating and Thermal Derating
Rated 200 A at 40 °C, 45 °C, and 50 °C, the 3VA1220-5EF42-0HC0 begins to derate above 50 °C: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C (–). For a panel with a 65 °C internal ambient, the usable current drops to 182 A — factor that into your load schedule. The maximum power loss is 42 W, which contributes to enclosure heating and should be included in the thermal budget for sealed or compact enclosures.
Breaking Capacity by Voltage
Interrupting ratings span the voltage range: 187 kA at 240 VAC, 121 kA at 415 VAC, 75.6 kA at 440 VAC, 30 kA at 500 VAC, and 17 kA at 690 VAC. The 690 V figure confirms suitability for 600 V-class North American systems and 690 V European industrial networks. The rated insulation voltage is 800 V, providing margin above the maximum operating voltage.
Dimensions and Panel Fit
The breaker measures 140 mm wide, 158 mm high, and 70 mm deep — a standard SENTRON 3VA footprint that mounts on a DIN rail or directly to a backplate. The 70 mm depth leaves clearance for rear-access wiring in a typical 200 mm deep enclosure. Verify the mounting hole pattern against your existing busbar or lug kit; the 3VA family uses a common bolt-center spacing for 4-pole units.