The Siemens 3RT2045-1AF00 is a SIRIUS 3RT2 power contactor in size S3 that switches three-phase motors up to 37 kW at 400 V (80 A in utilisation category AC-3), with a 110 V AC, 50 Hz operating coil. It has 1 NO + 1 NC integrated auxiliary contacts, and Siemens rates it at 125 A for resistive (AC-1) loads at 40 \u00b0C. Per the Siemens data sheet the coil picks up within 13 … 50 ms and drops out within 10 … 21 ms.<\/p>\n
Contactors in pump, fan, conveyor and compressor panels may switch thousands of times a day, and contact wear is the usual reason for replacement. Keeping a spare of the same order number avoids long stoppages.<\/p>\n
| Siemens order number<\/th>\n | 3RT2045-1AF00<\/td>\n<\/tr>\n |
|---|---|
| Product<\/th>\n | SIRIUS 3RT2 power contactor, 3-pole<\/td>\n<\/tr>\n |
| Size<\/th>\n | S3<\/td>\n<\/tr>\n |
| Utilisation category<\/th>\n | AC-3 \/ AC-3e<\/td>\n<\/tr>\n |
| Rated operational current AC-3 at 400 V<\/th>\n | 80 A<\/td>\n<\/tr>\n |
| Motor power AC-3 at 400 V<\/th>\n | 37 kW<\/td>\n<\/tr>\n |
| Motor power AC-3 at 230 V<\/th>\n | 22 kW<\/td>\n<\/tr>\n |
| Operational current AC-1 (40 \u00b0C, up to 690 V)<\/th>\n | 125 A<\/td>\n<\/tr>\n |
| Rated operating voltage, max.<\/th>\n | 1,000 V<\/td>\n<\/tr>\n |
| Coil voltage<\/th>\n | 110 V AC, 50 Hz<\/td>\n<\/tr>\n |
| Coil operating range<\/th>\n | 0.8 … 1.1 x Us (50 Hz)<\/td>\n<\/tr>\n |
| Coil pick-up power (50 Hz)<\/th>\n | 296 V\u00b7A<\/td>\n<\/tr>\n |
| Coil holding power (50 Hz)<\/th>\n | 19 V\u00b7A<\/td>\n<\/tr>\n |
| Auxiliary contacts (integrated)<\/th>\n | 1 NO + 1 NC<\/td>\n<\/tr>\n |
| Closing delay<\/th>\n | 13 … 50 ms<\/td>\n<\/tr>\n |
| Opening delay<\/th>\n | 10 … 21 ms<\/td>\n<\/tr>\n |
| Mechanical service life, typ.<\/th>\n | 10,000,000 operating cycles<\/td>\n<\/tr>\n |
| Power loss per pole (rated current)<\/th>\n | 5.3 W<\/td>\n<\/tr>\n |
| Short-circuit protection, main circuit (type 1)<\/th>\n | gG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80<\/td>\n<\/tr>\n |
| Ambient temperature (operation)<\/th>\n | -25 … +60 \u00b0C<\/td>\n<\/tr>\n |
| Connection type<\/th>\n | screw-type terminals<\/td>\n<\/tr>\n |
| Mounting<\/th>\n | screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715<\/td>\n<\/tr>\n |
| Dimensions (W x H x D)<\/th>\n | 70 x 140 x 152 mm<\/td>\n<\/tr>\n |
| Net weight<\/th>\n | 1.653 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>\nFor overload protection mount a SIRIUS 3RU2 thermal overload relay of size S3 directly under the contactor, or combine it with a 3RV2 motor starter protector of the same size using the Siemens link module. The coil voltage is coded in the order number (here 110 V AC, 50 Hz), so check it against your control circuit before ordering.<\/p>\n Frequently asked questions<\/h3>\n |
Per Siemens: 110 V AC, 50 Hz, operating range 0.8 … 1.1 x Us (50 Hz).<\/p>\n
It has 1 NO + 1 NC integrated; more can be added with 3RH2911 auxiliary switch blocks.<\/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
Send us the full order number from the label of the old part, or a clear photo of the label, together with the quantity you need. We check the number against the current manufacturer data before we quote and tell you if there is a newer replacement.<\/p>\n