With a 230 V AC, 50/60 Hz coil and a motor rating of 7.5 kW at 400 V, the Siemens 3RT2018-1AP01 is the size S00 member of the SIRIUS 3RT2 contactor range for 16 A AC-3 duty. It has 1 NO integrated auxiliary contact, and Siemens rates it at 22 A for resistive (AC-1) loads at 40 °C. Siemens quotes a typical mechanical life of 30,000,000 operating cycles for this contactor.
A contactor is the switching element of a motor starter: the PLC or a push-button energises the coil, and the main contacts connect the motor to the supply. Contactors wear with every start, so they are among the most frequently replaced parts in motor control centres.
See our Siemens industrial controls range, including SIRIUS 3RU2 overload relays and 3RV2 motor starter protectors for the same size.
Technical data
| Siemens order number | 3RT2018-1AP01 |
|---|---|
| Product | SIRIUS 3RT2 power contactor, 3-pole |
| Size | S00 |
| Utilisation category | AC-3 / AC-3e |
| Rated operational current AC-3 at 400 V | 16 A |
| Motor power AC-3 at 400 V | 7.5 kW |
| Motor power AC-3 at 230 V | 4 kW |
| Operational current AC-1 (40 °C, up to 690 V) | 22 A |
| Rated operating voltage, max. | 690 V |
| Coil voltage | 230 V AC, 50/60 Hz |
| Coil operating range | 0.8 … 1.1 x Us (50 Hz) |
| Coil pick-up power (50 Hz) | 37 V·A |
| Coil holding power (50 Hz) | 5.7 V·A |
| Auxiliary contacts (integrated) | 1 NO |
| Closing delay | 9 … 35 ms |
| Opening delay | 4 … 15 ms |
| Mechanical service life, typ. | 30,000,000 operating cycles |
| Power loss per pole (rated current) | 1W |
| Short-circuit protection, main circuit (type 1) | gG: 50 A (690 V, 100 kA), aM: 25 A (690 V, 100 kA), BS88: 50 A (415 V, 80 kA) |
| Ambient temperature (operation) | -25 … +60 °C |
| Connection type | screw-type terminals |
| Mounting | screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715 |
| Dimensions (W x H x D) | 45 x 58 x 73 mm |
| Net weight | 0.221 kg |
| Condition | New, original Siemens |
Typical applications
- Conveyor, mixer and packaging machine drives
- Pump, fan and compressor control panels
- Direct-on-line starters for motors up to 7.5 kW at 400 V
- Replacement of a worn 3RT2 contactor with the same rating
Compatibility and replacement
For overload protection mount a SIRIUS 3RU2 thermal overload relay of size S00 directly under the contactor, or combine it with a 3RV2 motor starter protector of the same size using the Siemens link module. Auxiliary contact blocks (3RH2911) can be snapped on the front to add more NO/NC contacts.
Frequently asked questions
Is it suitable for a 7.5 kW motor at 400 V?
This contactor is rated 7.5 kW at 400 V (AC-3, 16 A). Choose a contactor whose AC-3 rating at your supply voltage is at least the motor rating.
How many auxiliary contacts does it have?
It has 1 NO integrated; more can be added with 3RH2911 auxiliary switch blocks.
Do you ship to my country, and what is the warranty?
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.
Before you order
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.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
