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RFN380040 – T/O RELAY 0 25-0 4A MAN/AUTO
Lovato RFN380040 thermal motor protection relay with a 0.25–0.40 A adjustable current range designed for three-phase motor overload protection and industrial control applications.
£41.45
Why Choose the Lovato RFN380040 Motor Protection Relay?
The Lovato RFN380040 is a reliable thermal motor protection relay designed to protect three-phase motors against overload conditions in industrial motor control applications. As part of the Lovato RFN38 series, it provides dependable protection and seamless integration with compatible Lovato contactors.
This motor protection relay combines thermal overload protection with phase failure sensitivity, helping safeguard motors from excessive current and abnormal operating conditions. Its compact design and direct mounting capability simplify installation within electrical control systems.
With an adjustable operating current range of 0.25–0.40 A, the RFN380040 is suitable for protecting small industrial motors and is designed for direct mounting on Lovato BF09–BF38 contactors. The relay provides flexible reset options with manual or automatic resetting to suit different control requirements.
Key Advantages
- Reliable thermal motor overload protection for industrial applications.
- 0.25–0.40 A adjustable current range for small motor protection.
- Three-pole three-phase design suitable for AC motor circuits.
- Phase failure sensitivity helps protect motors against single-phase operation.
- Manual or automatic reset selection for flexible operation.
- Direct mounting on Lovato BF09–BF38 contactors for easy installation.
Key Features
- Lovato RFN38 motor protection relay series.
- 0.25–0.40 A adjustable overload setting.
- Three-pole thermal overload protection.
- Phase failure and single-phase sensitivity.
- Manual or automatic reset functionality.
- Class 10A tripping characteristic.
- Integrated test button and trip indicator.
- 1NO + 1NC auxiliary contacts for control and signalling.
- IP20 front protection rating.
Reliable Motor Protection for Industrial Systems
Thermal motor protection relays such as the Lovato RFN380040 monitor motor current and provide protection against overload conditions that can cause overheating and premature motor failure. By disconnecting the motor circuit when abnormal current levels occur, they help improve equipment reliability and operational safety.
The RFN38 series is designed for industrial automation and motor control applications where dependable overload protection and straightforward installation are required. Its compact format and direct contactor mounting make it suitable for a wide range of control panel designs.
Typical Applications
- Industrial motor control panels.
- Pumps and ventilation equipment.
- Conveyor and material handling systems.
- Small machinery and automation equipment.
- Manufacturing and processing systems.
- OEM electrical control assemblies.
Technical Specifications
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| Current Range | 0.25–0.4 A | |
|---|---|---|
| Device Type | Thermal Overload Relay | |
| Compatible With | BF09–BF38 | |
| Reset Type | Manual or automatic | |
| Monitoring Function | Temperature / thermistor | |
| Monitored Supply | Single-phase | |
| Contacts | 1NO + 1NC | |
| IP Rating | IP20 | |
| HS Code | 85364900 | |
| Manufacturer | Lovato Electric | |
| Series | RFN38 Motor Protection Relays | |
| Model | RFN380040 | |
| Product type | Thermal motor protection relay | |
| Number of poles | 3 | |
| Adjustable current range | 0.25–0.40 A | |
| Tripping class | 10A | |
| Reset mode | Manual or automatic | |
| Auxiliary contacts | 1NO + 1NC | |
| Protection rating | IP20 | |
| Rated insulation voltage | 690 V | |
| Rated impulse withstand voltage | 6 kV | |
| Mounting type | Direct mounting on BF09–BF38 contactors | |
| Weight | approx. 0.16 kg |
Frequently Asked Questions
What is the Lovato RFN380040 used for?
The RFN380040 is a thermal motor protection relay designed to protect three-phase AC motors from overload conditions in industrial applications.
What current range does this relay support?
The relay supports an adjustable operating current range of 0.25–0.40 A.
Which contactors is the RFN380040 compatible with?
The relay is designed for direct mounting on Lovato BF09–BF38 contactors.
Does the relay provide phase failure protection?
Yes, the RFN380040 includes phase failure and single-phase sensitivity for improved motor protection.
What reset options are available?
The relay supports both manual and automatic reset modes depending on the application requirements.
Trusted by Industrial Control Engineers
Lovato RFN38 motor protection relays provide dependable overload protection, flexible installation options and reliable motor safeguarding for industrial control applications.
