Rated 51 A / 22 kW at 400 V (AC-3), the Siemens 3RT2036-1AL20 is a 3-pole SIRIUS 3RT2 contactor, size S2, operated by a 230 V AC, 50/60 Hz coil. It has 1 NO + 1 NC integrated auxiliary contacts, and Siemens rates it at 70 A for resistive (AC-1) loads at 40 °C. At 230 V the AC-3 motor rating is 15 kW.
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 | 3RT2036-1AL20 |
|---|---|
| Product | SIRIUS 3RT2 power contactor, 3-pole |
| Size | S2 |
| Utilisation category | AC-3 / AC-3e |
| Rated operational current AC-3 at 400 V | 51 A |
| Motor power AC-3 at 400 V | 22 kW |
| Motor power AC-3 at 230 V | 15 kW |
| Operational current AC-1 (40 °C, up to 690 V) | 70 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) | 210 V·A |
| Coil holding power (50 Hz) | 17.2 V·A |
| Auxiliary contacts (integrated) | 1 NO + 1 NC |
| Closing delay | 10 … 80 ms |
| Opening delay | 10 … 18 ms |
| Mechanical service life, typ. | 10,000,000 operating cycles |
| Power loss per pole (rated current) | 4W |
| Short-circuit protection, main circuit (type 1) | gG: 160 A (690 V, 100 kA), aM: 80 A (690 V, 100 kA), BS88: 125 A (415 V, 80 |
| 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) | 55 x 114 x 130 mm |
| Net weight | 0.949 kg |
| Condition | New, original Siemens |
Typical applications
- Replacement of a worn 3RT2 contactor with the same rating
- Direct-on-line starters for motors up to 22 kW at 400 V
- Switching heaters and resistive loads (AC-1)
- Star-delta starter assemblies
Compatibility and replacement
For overload protection mount a SIRIUS 3RU2 thermal overload relay of size S2 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
Can I use it for a 7.5 kW motor?
This contactor is rated 22 kW at 400 V (AC-3, 51 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 + 1 NC integrated; more can be added with 3RH2911 auxiliary switch blocks.
How fast can you deliver, and is there a warranty?
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.
Ordering tips
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.
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.
