The Siemens 3VA4170-4ED24-3AA0 is a 2-pole circuit breaker from the 3VA4 series, built on a UL Frame 125 platform. It's rated for 70 A continuous (Ir fixed at 70 A) with a short-circuit breaking capacity of 25 kA at 480 V, placing it in the S (standard) breaking capacity class. The TM210 trip unit provides fixed thermal-magnetic overload protection, and the FTFM designation indicates fixed thermal, fixed magnetic settings — no field adjustment on Ir or Ii (short-circuit pickup is fixed at 10 x In). This is a line-protection breaker, sized for feeder or branch-circuit duty in a UL 489 panelboard.
What the ratings mean for fit
The 25 kA SCCR at 480 V is the key coordination figure. It tells you this breaker can safely interrupt a fault up to 25,000 A without welding contacts or cascading failure upstream. For a 480 V panel with an available fault current below that threshold, this breaker is a direct fit. The fixed 70 A Ir means it's not a field-adjustable thermal — you're locked into that overload setting, so verify your continuous load is at or below 70 A (and within NEC 80% continuous-load rules for a 70 A frame). The fixed Ii at 10 x In (700 A) gives a magnetic trip threshold suitable for motor-starting inrush or high-impedance faults; if your load has a locked-rotor current above 700 A, you'll need a breaker with a higher short-circuit pickup or a different trip curve.
Sourcing and compliance
RoHS compliant since 13-05-19, with a REACH Article 33 duty-to-inform note for lead (CAS 7439-92-1) above 0.1% w/w. The export control classification is AL: N / ECCN: EAR99, meaning no special licensing for most destinations. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.