With a 110 V AC, 50 Hz coil and a motor rating of 30 kW at 400 V, the Siemens 3RT2037-1AF00 is the size S2 member of the SIRIUS 3RT2 contactor range for 65 A AC-3 duty. It has 1 NO + 1 NC integrated auxiliary contacts, and Siemens rates it at 80 A for resistive (AC-1) loads at 40 °C. At 230 V the AC-3 motor rating is 18.5 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 | 3RT2037-1AF00 |
|---|---|
| Product | SIRIUS 3RT2 power contactor, 3-pole |
| Size | S2 |
| Utilisation category | AC-3 / AC-3e |
| Rated operational current AC-3 at 400 V | 65 A |
| Motor power AC-3 at 400 V | 30 kW |
| Motor power AC-3 at 230 V | 18.5 kW |
| Operational current AC-1 (40 °C, up to 690 V) | 80 A |
| Rated operating voltage, max. | 690 V |
| Coil voltage | 110 V AC, 50 Hz |
| Coil operating range | 0.8 … 1.1 x Us (50 Hz) |
| Coil pick-up power (50 Hz) | 190 V·A |
| Coil holding power (50 Hz) | 16 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) | 3.8 W |
| Short-circuit protection, main circuit (type 1) | gG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 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 | 0.953 kg |
| Condition | New, original Siemens |
Typical applications
- Replacement of a worn 3RT2 contactor with the same rating
- Switching heaters and resistive loads (AC-1)
- Star-delta starter assemblies
- Direct-on-line starters for motors up to 30 kW at 400 V
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. Older 3RT10 contactors were replaced by the 3RT20 series; send us the old order number and we will confirm the current equivalent.
Frequently asked questions
Can I use it for a 7.5 kW motor?
This contactor is rated 30 kW at 400 V (AC-3, 65 A). Choose a contactor whose AC-3 rating at your supply voltage is at least the motor rating.
Which overload relay fits it?
A SIRIUS 3RU2 overload relay of size S2, for example 3RU2136, set to the motor full-load current.
Can I get a price and delivery time?
Prices are quoted on request. Send the order number, quantity and delivery country on WhatsApp and we will reply with price and delivery time; air shipping is usually 5 to 7 days once ready, with a 1-year warranty.
How to order
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.
Need it fast? Send the order number, quantity and delivery country on WhatsApp or through the inquiry form and we reply with a quotation the same working day. All parts are new and original, covered by a 1-year warranty, and ship worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Local agents: Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
