The Siemens SENTRON 3VA2010-5HN42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, with a 187 kA interrupting capacity at 240 V. It uses the ETU350 electronic trip unit for line protection, meaning the trip curve is adjustable and more precise than a thermal-magnetic unit — useful for coordinating with downstream breakers in a selective scheme. The 187 kA rating at 240 V tells you it can handle very high fault currents common on large transformer secondaries or busway taps; the 3 kA at 690 V still covers most motor branch circuits at that voltage.
Dimensions and panel fit
The breaker measures 181 mm high, 140 mm wide, and 86 mm deep. That 140 mm width is standard for a 4-pole MCCB in this class — it fits the same cutout as other SENTRON 3VA frames, so a panel laid out for a 3VA2010-8HL42-0AA0 will accept this unit without re-drilling the gland plate. The 86 mm depth leaves room for rear busbar connections in a typical 600 mm deep enclosure.
Thermal performance and power loss
The breaker is rated for 100 A continuously across the full ambient range from 40 °C to 70 °C — no derating needed up to that temperature, which is unusual for an MCCB of this size. Maximum power dissipation is 13.5 W, so heat buildup in a dense panel is manageable; you can stack breakers without forced cooling in most enclosures.