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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RN1012-1CK00 |
| Alternative Part Number | 3RN10121CK00 |
| Manufacturer | Siemens |
| Product Type | Thermistor Motor Protection |
| Function | Standard Evaluation Unit |
| Operation Modes | Manual/Auto/Remote |
| Contacts Configuration | 1 Normally Open (NO) + 1 Normally Closed (NC) |
| Supply Voltage | 230 V AC / 110 V AC |
| Frequency | 50 Hz / 60 Hz |
| Number of Measuring Circuits | 1 |
| Temperature Range | Measurable from 60°C to 180°C |
| Features | Reclosing Interlock, Self-Reset, Defect Storage, External Reset |
| Display | LED Indicator |
| Protection Class | IP20 |
| Connection Type | Screw-Type Terminals |
| Mounting Type | Screw and Snap-On Mounting |
| Dimensions | Width: 22.5 mm, Height: 102 mm, Depth: 91 mm |
| Ambient Operating Temperature | -25°C to +60°C |
The Siemens 3RN1012-1CK00 is a robust thermistor motor protection unit designed to safeguard motors from potential overheating. This standard evaluation device is equipped with a single-pole double-throw (SPDT) contact configuration and is suitable for use with a 230 V ac supply voltage. It features a compact design with dimensions of 91 x 22.5 x 102 mm, making it an ideal choice for integration into a variety of control cabinet setups.
This thermistor relay is engineered to monitor the temperature of motors by evaluating the resistance of connected PTC thermistors. Upon detection of a temperature rise beyond the threshold, the device triggers an immediate response to disconnect the motor, thereby preventing damage due to overheating. The unit offers manual, automatic, and remote reset options, providing flexibility in control and reset methods.
The 3RN1012-1CK00 includes an LED display for clear indication of operational status and is housed in an IP20 rated enclosure, ensuring protection against solid objects larger than 12.5 mm. It is designed for straightforward screw terminal connections, facilitating easy installation and maintenance.
This device is a reliable solution for motor protection in industrial applications, where consistent performance and durability are essential. It is particularly suitable for use in environments where precise temperature monitoring and motor protection are critical for the smooth operation of machinery.
Commonly Asked Questions
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Marvo provides a full 12-month warranty on all products, whatever the condition. For your peace of mind, all parts are ‘Marvo Approved’ which means that they have been tested and checked to ensure that they are in working condition. If you are unhappy with the part(s) you received and would like to request a return, you can do so by completing our quick and easy online form. Once we have received your Returns Request, a member of the team will be in touch to discuss this further with you. You can read more about our warranty policy here.
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Lightning-Fast Express Shipping: Receive your order in record time with our express shipping options, ensuring you minimize downtime and keep your projects on track.
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Frequently Asked Questions
What type of protection does this thermistor provide?
The Siemens thermistor provides motor protection by monitoring the temperature of the motor windings and tripping the circuit if overheating is detected, preventing potential damage.
Can this device be manually reset?
Yes, the thermistor motor protection device features manual reset functionality, as well as options for automatic and remote resetting.
What is the voltage rating for this thermistor?
The thermistor is rated for a control supply voltage of 230 V ac or 110 V ac, depending on the application requirements.
What are the dimensions of this thermistor?
The dimensions of the thermistor are 91 mm in depth, 22.5 mm in width, and 102 mm in height.
What type of connections does the thermistor have?
The thermistor features screw-type terminals for secure and reliable electrical connections.
Is there an LED display on this thermistor?
Yes, the thermistor comes with an LED display for visual indication of the device's status.
What is the ambient operating temperature range for this thermistor?
The thermistor is designed to operate within an ambient temperature range of -25 to +60 degrees Celsius.
What is the IP rating of this thermistor?
The thermistor has an IP20 rating, indicating that it is protected against solid objects larger than 12.5 mm but not against water.
How many poles does this thermistor have?
The thermistor has 2 poles.
Does this thermistor have a reclosing interlock feature?
Yes, it includes a reclosing interlock to prevent automatic restarting of the motor after an overtemperature trip until the reset conditions are met.
Part conditions explained
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New unsealed: The product is in its original packaging, but the packaging has been opened or unsealed. It has never been used and should be in near pristine condition.
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New unboxed: The product does not come in its original packaging, but it has never been used and is in great working condition.
Refurbished: The product has been previously used, but it has undergone a thorough refurbishment process to restore it to a like-new or functional condition. Any defects or issues have been addressed, making it suitable for reuse.
Used: The product has been previously owned and has been used. It may show signs of wear and tear but is still functional and operational. The condition may vary depending on the specific item and its usage history.
