The Siemens 3RT2028-1AF00 is a SIRIUS 3RT2 power contactor in size S0 that switches three-phase motors up to 18.5 kW at 400 V (38 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 50 A for resistive (AC-1) loads at 40 \u00b0C. Siemens quotes a typical mechanical life of 10,000,000 operating cycles for this contactor.<\/p>\n
In a direct-on-line or star-delta starter the contactor does the actual switching, while the overload relay or motor starter protector provides protection. A worn contactor shows burnt contacts, humming or chattering, and failure to pull in.<\/p>\n
| Siemens order number<\/th>\n | 3RT2028-1AF00<\/td>\n<\/tr>\n |
|---|---|
| Product<\/th>\n | SIRIUS 3RT2 power contactor, 3-pole<\/td>\n<\/tr>\n |
| Size<\/th>\n | S0<\/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 | 38 A<\/td>\n<\/tr>\n |
| Motor power AC-3 at 400 V<\/th>\n | 18.5 kW<\/td>\n<\/tr>\n |
| Motor power AC-3 at 230 V<\/th>\n | 11 kW<\/td>\n<\/tr>\n |
| Operational current AC-1 (40 \u00b0C, up to 690 V)<\/th>\n | 50 A<\/td>\n<\/tr>\n |
| Rated operating voltage, max.<\/th>\n | 690 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 | 77 V\u00b7A<\/td>\n<\/tr>\n |
| Coil holding power (50 Hz)<\/th>\n | 9.8 V\u00b7A<\/td>\n<\/tr>\n |
| Auxiliary contacts (integrated)<\/th>\n | 1 NO + 1 NC<\/td>\n<\/tr>\n |
| Closing delay<\/th>\n | 8 … 40 ms<\/td>\n<\/tr>\n |
| Opening delay<\/th>\n | 4 … 16 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 | 3.2 W<\/td>\n<\/tr>\n |
| Short-circuit protection, main circuit (type 1)<\/th>\n | gG: 125 A (690 V,100 kA), aM: 50 A (690 V,100 kA), BS88: 125 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 | 45 x 85 x 97 mm<\/td>\n<\/tr>\n |
| Net weight<\/th>\n | 0.406 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 S0 directly under the contactor, or combine it with a 3RV2 motor starter protector of the same size using the Siemens link module. Older 3RT10 contactors were replaced by the 3RT20 series; send us the old order number and we will confirm the current equivalent.<\/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
Air shipping usually takes 5 to 7 days once the part is ready, to almost any country. Each part is new and original with a 1-year warranty. Message us on WhatsApp with the order number for a quotation.<\/p>\n
Message us the order number and quantity. For breakdowns, tell us the delivery address and we will offer the fastest shipping option. If the exact part is discontinued, we confirm the official successor before quoting.<\/p>\n