The Siemens 3RT20281BB400JA0 is a SIRIUS 3RT2 contactor rated for AC-3 duty at 18.5 kW on a 400 V three-phase supply, with one normally-open and one normally-closed auxiliary contact built in. AC-3 is the standard motor-switching category per IEC 60947-4-1 — this rating means it handles the inrush and breaking of squirrel-cage motors up to that power level. The 1NO+1NC auxiliary set covers basic feedback and interlocking without an add-on block.
Siemens 3RT20281BB400JA0 Contactor, AC-3 18.5kW/400V, 1NO+1N
MPN3RT20281BB400JA0
Siemens SIRIUS 3RT2 contactor, AC-3, 18.5 kW at 400 V, 1NO+1NC auxiliary contacts, screw terminal.
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Independent China distributor & sourcing agent· Listing updated Sep 2026
Product details
Frequently asked questions
What is 3RT20281BB400JA0 rated for?
It is an AC-3 contactor rated at 18.5 kW at 400 V, with 1NO+1NC auxiliary contacts, designed for switching three-phase motor loads.
Where can I buy 3RT20281BB400JA0?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
3RT20281BB400JA0