63 A SENTRON MCCB with TM240 release — panel fit and breaking capacity
The Siemens 3VA1163-3EF32-0JA0 is a SENTRON 3VA1 molded case circuit breaker rated for 63 A continuous current at 40 °C, with a 3-pole configuration and a TM240 thermal-magnetic overcurrent release. The TM240 designation means the thermal element is fixed at 63 A (the frame rating), while the magnetic short-circuit pickup is set at 240 A — 3.8× the continuous rating, typical for motor branch circuits where inrush must ride through without nuisance tripping. The breaker carries a shunt trip auxiliary release (3VA9688-0BL32) integrated at the factory, so a remote trip signal can drop the load without pulling the handle. Breaking capacity varies by line voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. At 415 V — the common European industrial distribution level — the 52.5 kA rating comfortably exceeds the typical 25–36 kA prospective fault current in most panelboards, so this breaker can be applied downstream of a larger feeder without series-rating concerns. The 690 V figure (10.5 kA) covers 600 V class North American systems and 690 V European motor drives. Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm high — a standard 3-pole MCCB footprint that fits SENTRON panelboards and most DIN-rail adapter plates. The front face carries IP40 protection, adequate for enclosed panel mounting where no water ingress is expected. Rated insulation voltage is 800 V, so the breaker can be used in 690 V systems without de-rating the internal creepage distances.
Thermal derating and operating limits
The 63 A rating holds flat from 40 °C to 50 °C ambient. Above 50 °C, the continuous current must be reduced: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If the panel ambient runs hot — say next to a drive or transformer — the derating curve is linear enough to calculate the actual trip point without re-specifying the breaker. The operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The breaker is configured for line protection (not motor protection), meaning the TM240 thermal curve is matched to cable and busbar thermal limits rather than motor overload curves. If the load is a motor, a separate overload relay downstream is required. The unit has no undervoltage release, no auxiliary contacts, no ground-fault monitoring, and no communication function — it is a plain thermal-magnetic breaker with a shunt trip for remote opening. The mechanical endurance is rated at 15,000 operations.
Lifecycle and sourcing posture
Sourcing is straightforward through independent distribution. The part is quoted to order against an RFQ; availability and current pricing are confirmed at quote time. No last-time-buy window is active, so there is no urgency to stockpile. The integrated shunt trip (3VA9688-0BL32) is a factory-fit option — if a panel calls for a field-installed shunt trip, the standard 3VA1163 without the -0JA0 suffix may be more economical.