Siemens SIRIUS 3RU2 Thermal Overload Relay 0.9-1.25 A

The Siemens SIRIUS 3RU2 thermal overload relay is a high-performance industrial component engineered to provide precise motor protection against thermal overloads and phase failures. Designed for seamless integration into electrical control circuits, this relay features an adjustable current setting range of 0.9 to 1.25 A, ensuring that your equipment remains protected within specific operational parameters. Its compact S00 size makes it an ideal choice for space-constrained control cabinets, offering reliable performance and long-term durability in demanding automation environments.

Advantages

This thermal overload relay offers exceptional reliability by providing accurate monitoring of electrical currents to prevent motor damage. The device is built with high-quality materials that withstand harsh industrial conditions, ensuring consistent operation over time. Its design allows for direct mounting onto contactors, which simplifies the installation process and reduces the need for additional wiring or complex mounting hardware. Furthermore, the adjustable current range provides flexibility, allowing users to fine-tune the protection level to match the specific requirements of their connected motors.

Suitable for

• Industrial motor control systems
• Automation and process control applications
• Protection of small electric motors
• Integration into electrical switchgear and control panels

When it may not be suitable

This relay is not suitable for applications requiring current ranges outside of the 0.9 to 1.25 A threshold. It is also not designed for use in environments with extreme moisture or corrosive gases unless housed in an appropriate protective enclosure.

Key specifications

• Current setting range: 0.9 to 1.25 A
• Size: S00
• Protection type: Thermal overload and phase failure
• Mounting type: Direct mounting on contactors

How to use

To install the relay, align it with the corresponding contactor and secure it directly onto the device. Once mounted, connect the motor cables to the output terminals of the relay. Use the adjustment dial on the front of the unit to set the current value according to the motor's rated operational current. After installation, perform a test to ensure the relay functions correctly within the circuit.

What to consider before purchase

• Verify that the motor's rated current falls within the 0.9 to 1.25 A range.
• Ensure compatibility with the specific contactor size S00.
• Check the environmental conditions of the installation site.

Usage recommendations

Always ensure that the power supply is disconnected before installing or adjusting the relay to prevent electrical hazards. Regularly inspect the device for signs of wear or damage to maintain optimal system safety.