Rated 80 A / 37 kW at 400 V (AC-3), the Siemens 3RT2038-1NB30 is a 3-pole SIRIUS 3RT2 contactor, size S2, operated by a 20-33 V AC/DC, 50/60 Hz, with integrated varistor coil. It has 1 NO + 1 NC integrated auxiliary contacts, and Siemens rates it at 90 A for resistive (AC-1) loads at 40 °C. Siemens quotes a typical mechanical life of 10,000,000 operating cycles for this contactor.
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.
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 | 3RT2038-1NB30 |
|---|---|
| Product | SIRIUS 3RT2 power contactor, 3-pole |
| Size | S2 |
| Utilisation category | AC-3 / AC-3e |
| Rated operational current AC-3 at 400 V | 80 A |
| Motor power AC-3 at 400 V | 37 kW |
| Motor power AC-3 at 230 V | 22 kW |
| Operational current AC-1 (40 °C, up to 690 V) | 90 A |
| Rated operating voltage, max. | 690 V |
| Coil voltage | 20-33 V AC/DC, 50/60 Hz, with integrated varistor |
| Coil operating range | 0.8 … 1.1 x Us |
| Coil pick-up power | 23 W |
| Coil holding power | 1W |
| Auxiliary contacts (integrated) | 1 NO + 1 NC |
| Closing delay | 35 … 110 ms |
| Opening delay | 30 … 55 ms |
| Mechanical service life, typ. | 10,000,000 operating cycles |
| Power loss per pole (rated current) | 5.7 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 | 1.084 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
- Pump, fan and compressor control panels
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
What coil voltage does it need?
Per Siemens: 20-33 V AC/DC, 50/60 Hz, with integrated varistor, operating range 0.8 … 1.1 x Us.
Which overload relay fits it?
A SIRIUS 3RU2 overload relay of size S2, for example 3RU2136, set to the motor full-load current.
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.
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.
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.
