The Siemens 3RU2136-4QB0 is a SIRIUS 3RU2 thermal overload relay for motor protection, adjustable from 47 … 57 A, in size S2 for direct mounting on a SIRIUS 3RT2 contactor. It has 1 NO + 1 NC auxiliary contacts: the NC contact opens the contactor coil circuit on overload and the NO contact can signal the trip to the PLC.<\/p>\n
The overload relay is the classic partner of a contactor in a motor starter. It is set to the motor rated current and can be reset manually or automatically after the motor has cooled down.<\/p>\n
| Siemens order number<\/th>\n | 3RU2136-4QB0<\/td>\n<\/tr>\n |
|---|---|
| Product<\/th>\n | SIRIUS 3RU2 thermal overload relay<\/td>\n<\/tr>\n |
| Size<\/th>\n | S2<\/td>\n<\/tr>\n |
| Current setting range<\/th>\n | 47 … 57 A<\/td>\n<\/tr>\n |
| Trip class<\/th>\n | CLASS 10<\/td>\n<\/tr>\n |
| Auxiliary contacts<\/th>\n | 1 NO + 1 NC<\/td>\n<\/tr>\n |
| Rated operating voltage<\/th>\n | 690 V<\/td>\n<\/tr>\n |
| Motor power at 400 V (approx.)<\/th>\n | 30 kW<\/td>\n<\/tr>\n |
| Mounting<\/th>\n | Contactor mounting (size S2)<\/td>\n<\/tr>\n |
| FLA, 3-phase motor at 480 V (UL)<\/th>\n | 57 A<\/td>\n<\/tr>\n |
| Power loss (hot, total)<\/th>\n | 15.6 W<\/td>\n<\/tr>\n |
| Ambient temperature (operation)<\/th>\n | -40 … +70 \u00b0C<\/td>\n<\/tr>\n |
| Dimensions (W x H x D)<\/th>\n | 55 x 90 x 105 mm<\/td>\n<\/tr>\n |
| Net weight<\/th>\n | 0.321 kg<\/td>\n<\/tr>\n |
| Condition<\/th>\n | New, original Siemens<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nTypical applications<\/h3>\nCompatibility and replacement<\/h3>\nPlugs directly onto 3RT2 contactors of size S2 (3RT203x). For separate (stand-alone) mounting Siemens offers a terminal support. For electronic protection with a wider setting range Siemens offers the 3RB3 series.<\/p>\n Frequently asked questions<\/h3>\n |
Per Siemens the range corresponds to about 30 kW at 400 V (AC-3), but always set it by the motor rated current, not by the kW rating.<\/p>\n
Turn the setting dial to the motor rated current from the nameplate, within 47 … 57 A.<\/p>\n
The trip class per IEC 60947-4-1: at 7.2 times the setting current the relay trips within 4 to 10 seconds, which suits motors with normal starting.<\/p>\n
Yes. RendatSP ships worldwide from Yiwu, China, by air in 5 to 7 days once the part is ready, and every part carries a 1-year warranty. Send the order number and quantity on WhatsApp and we will reply with a quotation.<\/p>\n
Compare the complete order number on the old unit with this page, including the suffix: in most ranges the last characters set the coil voltage, current range or version. If the label is worn, send us a photo and we will identify the part.<\/p>\n