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.
SKU:RFN380040MPN:RFN380040
Price
List Price£69.09ex VAT
Your Price (ex VAT)
£69.09
Manufacturer Lead TimePlease contact us for a delivery time before you order
Get the best trade pricesTrade exclusive
Create a trade account to unlock exclusive pricing, special offers and more.
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
Tick the specs you need, then view products that match.
Reset Type
Manual or automatic
Monitoring Function
Temperature / thermistor
Monitored Supply
Single-phase
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
Contacts
1NO + 1NC
IP Rating
IP20
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.
Reset Type
Manual or automatic
Monitoring Function
Temperature / thermistor
Monitored Supply
Single-phase
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
Contacts
1NO + 1NC
IP Rating
IP20
No documents available for this product.
UK delivery
Delivery options
Free UK delivery on orders over £200 ex VAT. Order in-stock items before 2pm Monday to Friday for next-day delivery.
This productLead time on request
Please contact us for a delivery time before you order
Standard delivery
£8 ex VAT · free over £200
UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
Collect from our showroom
Mon–Fri, 8am–5pm
Order and pay online, then collect from our showroom.
Please allow 15–30 minutes after ordering for us to prepare your order.
Northern Ireland, ROI & export
Priced at checkout
We deliver to Northern Ireland, the Republic of Ireland and overseas.
Delivery is calculated at checkout based on your destination.
Orders with mixed availability
Shipped complete
If part of your order is on a lead time, we hold it and send everything together.
Need the in-stock items sooner? Ask us and we can split the delivery.
Business customer returns
Returns & order support
Need to return an item? Find the guidance for your order below, then contact our team before sending anything back.
Stocked items
Request within 30 days
Changed your mind or ordered the wrong item? Request a return within 30 days of receipt. There is no restocking charge.
Items must be unused, in resalable condition and in their original packaging, and returns need our approval first. Return carriage is at your cost, and the original delivery charge is not refunded.
Faulty or damaged items
Tell us as soon as possible
Faulty, damaged on delivery or the wrong product supplied? Contact our team as soon as possible with the details.
We will review the issue and arrange an appropriate resolution under our terms and conditions and your statutory rights.
Made-to-order items
Manufacturer approval needed
Manufactured, configured and special-order products can only be returned with the manufacturer’s approval. Any handling charge is agreed with you when you request the return.
This does not affect claims for faulty goods or items that do not meet the agreed specification.
Let’s get your return sorted.
Send your order number, product details and reason for return. For faults or delivery damage, include photographs if available. We will confirm the next steps.
The 30-day return request period applies to change-of-mind returns for stocked items. It does not limit your statutory rights for faulty or non-conforming goods.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
Priority sourcing and supply support
Flexible payment terms for qualifying organisations
Support for engineering, maintenance, and operations
500 +
Stock lines ready to ship
1,000 +
Same day dispatches
3500 +
Customers supported
28
Trusted Manfacturers
● frequently asked questions
Common questions about our products and support
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
What product ranges do you supply
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Can you help specify the correct part?
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Do you have stock for urgent orders?
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
What are your delivery times and costs?
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
What about warranties, returns and faulty items?
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
