Description
Siemens 3RT2036-3AC20 contactor — description and applications
The Siemens 3RT2036-3AC20 contactor is a three-pole power contactor from the SIRIUS 3RT2 series, designed for switching the supply circuits of electric motors and other AC loads in industrial installations. According to the nameplate on the packaging, the unit has a 24 V AC (50/60 Hz) control coil and AC-3 switching ratings of 51 A at 400 V, corresponding to 22 kW. The product is aimed at maintenance departments, automation system integrators, machine builders and electrical service teams who need a proven, genuine Siemens component for building or repairing power distribution boards.
A contactor of this frame size (S2 in the SIRIUS nomenclature) is one of the most commonly used components in direct-on-line starting circuits for three-phase motors and in medium-power AC load switching circuits. Thanks to its compact design, it is easy to fit into a standard switchboard on a mounting rail.
Key features
- 24 V AC, 50/60 Hz control coil — low-voltage control supply
- Rated current in the AC-3 category: 51 A at 400 V
- Rated motor power at 400 V: 22 kW (AC-3 utilization category)
- Built-in auxiliary contacts in a 1 NO + 1 NC configuration
- GB/T14048.4 compliance marking visible on the packaging label
- Mounting design typical for the SIRIUS 3RT2 series (exact mounting type to be verified against Siemens documentation)
Technical specifications
| Parameter | Value |
|---|---|
| Manufacturer | Siemens |
| Device type | Power contactor |
| Series | SIRIUS 3RT2 |
| Catalog number (MPN) | 3RT2036-3AC20 |
| Coil voltage | 24 V AC, 50/60 Hz |
| AC-3 rated current | 51 A |
| AC-3 rated voltage | 400 V |
| Rated power at 400 V (AC-3) | 22 kW |
| Auxiliary contacts | 1 NO + 1 NC |
| Standard marking on the label | GB/T14048.4 |
| Country of manufacture | Germany (Made in Germany) |
| Importer indicated on the label | Siemens plc, Manchester, UK |
| Condition | Brand new (factory new), unused, original packaging |
Applications
The Siemens 3RT2036-3AC20 contactor is used wherever safe and reliable switching of motor circuits and other AC loads is required. Typical industries include machine building, food processing, industrial power engineering, the chemical industry, and industrial ventilation and air-conditioning systems.
This component is used in power distribution boards, control cabinets of production machinery, and direct-on-line starting circuits for pumps, fans and conveyors. Thanks to its AC-3 ratings of 51A/400V/22kW, it is suitable for medium-power motor loads.
Condition and scope of delivery
The Siemens 3RT2036-3AC20 contactor offered here is a brand new (factory new) product from surplus stock (new-old-stock) — unused and never installed in any system. The photos show the original Siemens cardboard box with an intact label containing the catalogue number, technical data, barcode and certification markings (CE, UKCA, EAC). The box shows no visible mechanical damage.
This condition makes it a fully functional component, often no longer available through regular distribution channels or available only with a longer lead time from the manufacturer. Buyers should review all product photos, as they form an integral part of the description and document the actual condition of the packaging and label.
Why RECOSTOCK
RECOSTOCK specializes in selling brand new (factory new) industrial automation components sourced from surplus stock and liquidations, offered at prices lower than in regular distribution. We issue a VAT invoice for every order, and shipments are packed appropriately for electronic and industrial equipment. Orders are shipped from Poland. We also help verify catalogue numbers and select replacements based on nameplate data.
Compatibility and installation
The Siemens 3RT2036-3AC20 contactor is part of the SIRIUS 3RT2 series and works as standard with the accessories designed for this contactor family (e.g. auxiliary contact blocks, timer modules) — the full list of compatible accessories should be confirmed in the manufacturer's documentation. Typical mounting for this SIRIUS contactor frame size is DIN rail or screw fixing, which should be verified in the product datasheet.
Before purchasing, always compare the full catalogue number 3RT2036-3AC20 with the technical documentation of the machine or the component being replaced, to rule out differences in coil voltage variants or auxiliary contact configuration.
Documentation and similar products
Detailed datasheets and manuals for this contactor family can be found in the Siemens technical documentation. We also invite you to browse our other listings — see other automation components at RECOSTOCK.
Frequently asked questions (FAQ)
How can I check whether this is the right Siemens 3RT2036-3AC20 contactor?
The catalog number 3RT2036-3AC20 is printed on the packaging label and on the device itself — compare it carefully, character by character, with the designation required in your machine documentation.
Is this contactor compatible with my installation?
Compatibility depends on the coil voltage (24 V AC), the load current, and the auxiliary contact configuration (1 NO + 1 NC) — before purchasing, we recommend comparing these with the technical documentation of your existing system.
What does new-old-stock status mean?
This means the product is brand new (factory new) and unused, but comes from a distributor's or manufacturer's surplus stock rather than from current, ongoing production — which is why it may be available faster and at a lower price than a standard order.
How is shipping handled and will I receive a VAT invoice?
We ship the product from Poland in protective packaging suitable for electronic components, and we issue a VAT invoice for every order.
Can I count on help with confirming a replacement part?
Yes, we help verify catalog numbers and select the right replacement based on the nameplate data — feel free to contact us before purchasing.
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