SIEMENS 3RB21434EB0 Overload Relay, 25 to 100A, 3P, NEMA S3. More details: Overload Relay, Starter Type IEC, NEMA Size S3, Current Range 25.0 to 100A, For Use With 108284 Contactors, Features Manual and Auto Reset, Earth Fault Detection, Trip Class 5, 10, 20, 30 Adjustable, Number of Poles 3, Frame Size S3, Height 4.17 In., Depth 4.88 In., Width 2.76 In., Separate Mounting Adaptor, Standards UL, CSA, CCC, ABS, ATEX, C-Tick