Overload Relays 3RB2 Solid-State Overload Relays 3RB20, 3RB21 for standard applications 3RB20 36, 3RB21 33 , size S2 with straight-through transformer 3RB20 56, 3RB21 53 , size S6 with straight-through transformer 74 NSB0_01513a 79 95 60 45 104 5 NSB0_01517a 55 Ш 5 120 95 150 73 5 Ш 7,2 Ш 15 22 27 73 3RB20 46, 3RB21 43 , size S3 with straight-through transformer 36 36 24 24,8 51 64 67 86 35 30 70 60 2 NSB0_01515 Ш 5 5 119 18 16 34 Schematics 3RB20 16 3RB21 13 ! " ! % 3RB20 26 to 3RB20 66 3RB21 23 to 3RB21 63 ! " ! % 28 Siemens · 2009