What the 55 kA Icu Rating Means for Your Panel
The Siemens 3VA2510-5JP32-0AK0 is a 3-pole IEC frame 1000 molded case circuit breaker rated for 55 kA Icu at 415 V AC — breaking capacity class M per IEC 60947-2. The ETU550 electronic trip unit provides LSI protection (long-time, short-time, instantaneous) with overload protection adjustable Ir=400 A...1000 A and short-time pickup Isd=0.6...10x In, so it covers both feeder and main breaker roles in a 1000 A rated panel.
Trip Unit & Protection Coordination
The ETU550 LSI trip unit gives you adjustable long-time pickup (Ir), short-time pickup (Isd), and instantaneous pickup (Ii=1.5...10x In). That means you can coordinate selectively with downstream breakers — set Isd high enough that a branch fault clears before the main trips. The neutral conductor protection is optional via an external current transformer, supporting up to 160% of phase rating.
Deployment Context
This breaker mounts in a standard IEC distribution panel or switchboard — it is a fixed (non-withdrawable) unit, so plan for isolation upstream. The 3VA2 frame is sized for bolted busbar connection; verify busbar spacing and drilling pattern against the frame 1000 footprint before panel layout.