The Siemens 3VA4125-5ED34-1AA0 is a 3-pole molded case circuit breaker from the 3VA4 series, built on a UL Frame 125. It's rated 35 kA at 480 V AC, which means it can safely interrupt fault currents up to that level on a 480 V line without upstream devices needing to clear the fault — that's your SCCR headroom for the panel. The TM210 trip unit gives fixed thermal-magnetic protection: overload Ir is permanently set at 25 A, and short-circuit pickup Ii is fixed at 12 times In (300 A). This is a line-protection breaker, not a motor-protection piece — the fixed thermal setting suits feeder or distribution duty where you don't need adjustable overloads. The UL 489 SB (naval) suffix means it carries naval shipboard certification on top of the standard UL 489 listing. That adds shock, vibration, and tilt testing per military-grade requirements — relevant if this lands in a marine or defense supply chain, not just a commercial panel.
Sourcing and lifecycle
RoHS compliance dated from January 1, 2017. Note the REACH Article 33 disclosure: lead (CAS 7439-92-1) above 0.1% w/w in the candidate list. That's typical for electrical contacts and solder joints in this class — not a showstopper for most industrial use, but worth flagging for any end-user with strict REACH downstream reporting obligations.
Integration notes
Terminal connection — line and load lugs are included. The 3VA4 frame accepts standard bus bar or cable connections. Panel builders should plan for the 160 x 135 x 88 mm envelope. The breaker mounts on a DIN rail or directly to a backplate via the frame's mounting slots.