Siemens 3VA1080-4ED32-0HH0 — 80 A SENTRON MCCB for Line Protection
The Siemens 3VA1080-4ED32-0HH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for a continuous current of 80 A, with a TM210 thermal-magnetic release for line protection. Its interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that determine whether this breaker clears a bolted fault upstream without cascading to the main bus. The 80 A rating holds steady from 40 °C up to 50 °C, then derates to 72 A at 70 °C, so the ambient temperature inside the enclosure drives the actual ampacity you can count on.
Ratings and What They Mean for Your Panel
The 121 kA at 240 V and 75.6 kA at 415 V are the short-circuit current ratings (SCCR) — the maximum fault current this breaker can safely interrupt at those voltages. For a 480 V panel fed from a 1000 kVA transformer, the available fault current often exceeds 50 kA; this MCCB handles that with headroom. The 800 V rated insulation voltage (Ui) tells you the breaker's internal creepage and clearance are designed for 600 V class systems, common in North American industrial plants. The IP40 protection on the front means the breaker face is protected against tools and small wires entering, but the enclosure itself must provide any washdown or dust rating. The TM210 release is a thermal-magnetic trip unit — the thermal element protects against sustained overloads (heating), the magnetic element handles short-circuit instantaneously. It is non-electronic, so no field programming or communication; it is a fixed-characteristic breaker for straightforward line protection where you do not need adjustable long-time or short-time pickup. The shunt trip (STL) auxiliary release allows remote tripping via a control signal, useful for emergency-stop circuits or interlocking with a fire-alarm panel. The auxiliary contact configuration — 2 auxiliary switches plus 1 trip alarm switch HQ — gives you three separate signal paths: two for status indication (open/closed) and one dedicated to the tripped state. The trip alarm is normally open and closes only when the breaker trips on fault, so a PLC can distinguish a manual open from a protective trip without extra logic.
Mounting and Integration
The 3VA1080-4ED32-0HH0 mounts on a DIN rail or can be screw-fixed to a backplate. Its 76.2 mm width (3-pole, standard 25.4 mm per pole) matches the footprint of other SENTRON 3VA frame breakers, so a panel laid out for a 3VA1010 will accept this unit without re-drilling. The 70 mm depth is shallow enough for most 200 mm deep enclosures, leaving room for rear-connected busbars or a shunt-trip wiring harness.