SENTRON 3VA2025-5KP36-0AA0 — 25 A MCCB with ETU850 Trip Unit
The Siemens 3VA2025-5KP36-0AA0 is a SENTRON series molded case circuit breaker (MCCB) rated for 25 A continuous current on a 3-pole frame, fitted with the ETU850 electronic trip unit. It's designed for line protection in distribution panels, with a communication function for integration into higher-level monitoring systems. The breaking capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — covering most low-voltage fault scenarios in industrial and commercial installations.
What the Ratings Mean for Fit
The 25 A continuous rating is the current the breaker carries without tripping under normal conditions — match this to your load's full-load amps. The ETU850 is an electronic trip unit offering adjustable overload and short-circuit protection curves, giving finer coordination than a fixed thermal-magnetic unit. The 3-pole construction suits three-phase circuits; the IP40 front protection means it's protected against tools and small wires touching live parts in a closed panel, but not against water ingress.
Physical Fit and Mounting
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — standard for a 3VA2 frame. It mounts on a DIN rail or directly to a backplate in the enclosure. Verify the panel cutout and busbar spacing against these dimensions before ordering; the 105 mm width is the same as other 3VA2 3-pole units, so a panel laid out for a sibling like the 3VA2125-8KQ42-0AA0 should accept this one without rewiring — same frame, same footprint.