# Siemens 3RN2010-2CW30 Thermistor Motor Protection Relay, 17.5 mm, Spring-Loaded Terminals, 1NO + 1NC, 24V AC/DC

**URL:** https://aio.lv/en/product--siemens-3rn20102cw30--1805575
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3RN20102CW30
**EAN:** 4047621004440
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 99.99 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 82.64 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rn20102cw30--1805575

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3RN2010-2CW30 is a compact 17.5 mm thermistor motor protection relay designed for reliable temperature monitoring in industrial applications. It features spring-loaded terminals for secure connections and includes 1NO and 1NC contacts. Operating on a 24V AC/DC supply, this device ensures effective protection against motor overheating by monitoring PTC sensors, making it an essential component for industrial automation and motor control systems.

## Long description

The Siemens 3RN2010-2CW30 is a high-precision thermistor motor protection relay engineered for the reliable monitoring of motor temperatures in demanding industrial environments. With a compact width of 17.5 mm, this device is designed to save space in control cabinets while providing robust protection against overheating. It utilizes advanced PTC sensor technology to detect thermal anomalies, ensuring that motors are protected from damage caused by excessive heat during operation.
Advantages
This protection relay offers significant benefits for industrial automation, primarily through its space-saving design that allows for high-density mounting in electrical panels. The integration of spring-loaded terminals facilitates quick and secure wiring, which is resistant to vibrations and thermal expansion, reducing maintenance requirements. Its dual contact configuration provides flexibility in control circuit design, while the universal 24V AC/DC power supply ensures compatibility with a wide range of standard industrial control systems.
Suitable for
Monitoring motor winding temperatures in industrial machinery
Protection against thermal overload in pumps and fans
Integration into automated motor control centers
Applications requiring compact DIN-rail mounted safety components
When it may not be suitable
This device is specifically designed for use with PTC thermistor sensors and will not function correctly if the motor is not equipped with compatible temperature-sensing elements. It is not intended for direct motor current monitoring or as a standalone overload relay for applications that do not utilize thermistor-based thermal protection.
Key specifications
Width: 17.5 mm
Connection type: Spring-loaded terminals
Contacts: 1 Normally Open (NO) and 1 Normally Closed (NC)
Supply voltage: 24V AC/DC
Sensor type: PTC thermistor
How to use
Installation involves mounting the relay onto a standard 35 mm DIN rail within a control cabinet. Connect the PTC sensor leads from the motor to the designated input terminals on the relay. Connect the control circuit wiring to the NO and NC output contacts according to your specific safety logic. Finally, connect the 24V AC/DC power supply to the input terminals. Once powered, the relay will continuously monitor the resistance of the PTC sensor and trigger the output contacts if the temperature threshold is exceeded.
What to consider before purchase
Verify that your motor is equipped with integrated PTC thermistor sensors
Ensure your control system operates on a 24V AC/DC power supply
Check available space in your control cabinet to confirm the 17.5 mm width is appropriate
Confirm the contact configuration meets your specific safety circuit requirements
Usage recommendations
Regularly test the functionality of the thermistor relay during scheduled maintenance intervals to ensure that the motor protection circuit remains operational and that the PTC sensor connection is secure.

## FAQ

### How much does the Siemens 3RN2010-2CW30 Thermistor Motor Protection Relay cost, and is it available for purchase?

The price is 99.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 16.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Siemens 3RN2010-2CW30 Thermistor Motor Protection Relay be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Siemens products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Siemens service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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