ABB 1SCA151250R1001 OTM125F4C20D400C 4P 2.5 kA Icw Automatic Transfer Switch

Rated 125 A across 4 poles, the ABB 1SCA151250R1001 OTM125F4C20D400C is a self-supplied compact automatic transfer switch for 380-415 V AC mains-generator installations. Its type 20D control unit carries fixed operating parameters set at the factory, which keeps commissioning simple where the switching logic does not need field adjustment. It withstands 2.5 kA for 1 s and mounts on a DIN rail or base plate.

Technical Specifications

Selection Notes

Four switched poles put the 1SCA151250R1001 in the neutral-switching bracket of the 125 A Compact ATS range, needed where the installation isolates neutral between the two sources rather than bonding it on both sides. The 20D controller fixes the voltage thresholds and switching delay at the factory, so there is no field configuration step beyond wiring. Where a project needs those thresholds adjustable on site, the 21D version in the same 125 A, 4-pole frame is the alternative; pick this unit when the standard settings already match the installation.