The Siemens SENTRON 3VA2063-5HN42-0AA0 is a 4-pole molded case circuit breaker rated for 63 A continuous current, fitted with the ETU350 electronic trip unit. This is a line-protection design — meaning it's configured for feeder and distribution duty, not motor-starting or generator protection. The ETU350 provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves, which gives the specifying engineer selectivity headroom downstream without sacrificing trip speed on a hard fault.
Interrupting capacity and voltage class
This MCCB delivers 187 kA interrupting capacity at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. The 187 kA figure at 240 V tells you it can ride through a fault on a low-voltage distribution transformer secondary without the upstream fuse or breaker needing to clear — that's useful for high-fault-current panels in industrial switchboards. The 3 kA at 690 V is a derated condition; if your system runs at 690 V line-to-line, verify that the available fault current stays under that ceiling.
Thermal derating and operating range
The 63 A continuous rating holds flat across the entire ambient range from 40 °C to 70 °C — no derating curve to calculate for a warm panel. That's unusual for a molded case breaker; most lose 10–15 % by 60 °C. The operating temperature floor is -25 °C, storage from -40 °C to 80 °C. Power dissipation at full load is 5.4 W, which is manageable for dense panel layouts.
Physical fit and panel integration
Dimensions are 181 mm height, 140 mm width, 86 mm depth. The 86 mm depth is the dimension behind the panel face — relevant when fitting into a shallow enclosure or a retrofit bucket where the back-of-panel clearance is tight. The 140 mm width for a 4-pole frame is standard for this SENTRON class; it matches the mounting footprint of the 3VA2 family, so a panel drilled for a 3VA2040-8HN42-0AA0 will accept this unit without re-drilling or bus-bar rework, provided the lugs accept the same conductor size.
Lifecycle and sourcing
The lifecycle stage is listed as current — meaning Siemens has not issued an end-of-life notice, and the part remains in the active catalog. No successor order code has been published. For a BOM freeze or a long-term project, this is a stable line item. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.
Approvals and compliance
Front-face protection class is IP40 — suitable for dry indoor panel mounting where no water jets or dust ingress are expected. The insulation voltage is rated 800 V. The breaker carries no undervoltage release, no shunt trip, and no communication function as configured; it is a standalone thermal-magnetic replacement with electronic trip adjustment accessible on the front face.