ABB 1SCA151251R1001 OTM125F4C21D400C 4P 2.5 kA Icw Automatic Transfer Switch

With 4 poles and a 125 A rating, the ABB 1SCA151251R1001 OTM125F4C21D400C is a self-supplied automatic transfer switch for 380-415 V AC mains-generator changeover. Its type 21D control module has adjustable operating parameters, letting switching delays and voltage thresholds be tuned on site rather than fixed at the factory. The unit withstands 2.5 kA for 1 s and mounts on a DIN rail or base.

Technical Specifications

Selection Notes

The 1SCA151251R1001 pairs 4-pole neutral switching with the 21D controller's field-adjustable thresholds and timing, which is the combination to specify when an installation both isolates neutral between sources and needs the transfer logic set outside factory defaults - for example a longer generator run-up delay. Where neutral switching is required but the standard timing is acceptable, the 20D fixed-parameter unit in the same 125 A, 4-pole frame removes a commissioning step. This unit is for sites where both the pole count and the control settings need to match specific project requirements.