Siemens 3VA1032-4ED32-0JA0 — 32 A SENTRON MCCB for Line Protection
The Siemens 3VA1032-4ED32-0JA0 is a SENTRON molded case circuit breaker (MCCB) rated for 32 A continuous current (Iu) at 40 °C, with a 3-pole configuration and a TM210 thermal-magnetic overcurrent release. It's built for line protection duty — meaning it sits upstream of branch circuits, not as a motor-protective device — and carries a 121 kA interrupting rating at 240 V, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V. That's enough fault-clearing capacity for most industrial distribution panels without needing a current-limiting upstream breaker. The TM210 release is a fixed thermal-magnetic trip unit — no interchangeable rating plugs, no electronic adjustment. That keeps the BOM simple: what you spec is what you get, and there's no risk of a field adjustment drifting out of coordination. The breaker includes a shunt trip (STL) as the auxiliary release, but no undervoltage release, no auxiliary contacts, and no communication module. It's a clean, no-frills line protection breaker for a panel that already has its monitoring handled upstream.
Thermal Derating — What the 32 A Rating Actually Means in a Warm Panel
The 32 A rating holds flat from 40 °C through 50 °C, which covers most ventilated industrial enclosures. At 55 °C it derates to 30.72 A, at 60 °C to 30.08 A, at 65 °C to 29.44 A, and at 70 °C to 28.8 A. If your panel runs hot — say, a compact MCC with multiple breakers ganged together — that derating curve is the real limit, not the nameplate 32 A. Plan your load at 28.8 A if the ambient at the breaker face hits 70 °C. The breaker's front face carries an IP40 rating — protected against tools and small wires, but not against water ingress. That's standard for a panel-mounted MCCB; no special gasketing needed for a dry indoor enclosure. The operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C.
Lifecycle and Sourcing — Current Production, No Phase-Out Signal
The integrated auxiliary trip is a separate order code, 3VA9688-0BL32, which you'd order alongside the breaker if your design requires a shunt-trip function. The breaker itself ships without auxiliary contacts or a ground-fault monitoring module — those are add-on accessories, not built in.
Physical Fit and Panel Integration
The latching endurance is rated at 15,000 operations — that's mechanical life, not electrical life under load. For a line protection breaker that sees infrequent switching (maybe a few cycles a year for maintenance isolation), that's more than adequate. If you're using it as a disconnect switch under load, factor in the electrical endurance curve from the device manual.