Standard delivery
£8 ex VAT · free over £200UK 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.
RFN381800 – T/O RELAY 13-18A MAN/AUTO
Lovato RFN381800 three-pole thermal motor protection relay with a 12–18 A adjustable operating current range, class 10A tripping characteristic and auxiliary contacts for industrial motor control applications.
£46.91
Why Choose the Lovato RFN381800 Motor Protection Relay?
The Lovato RFN381800 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 motor protection relay range, it provides adjustable thermal protection with dependable operation in motor starter and automation systems.
This motor protection relay features a three-pole thermal release with a class 10A tripping characteristic, helping protect motors from sustained overload conditions. Its adjustable current setting, manual or automatic reset capability and integrated auxiliary contacts provide flexible installation options for industrial control applications.
With an adjustable operating current range of 12–18 A, the RFN381800 is suitable for protecting industrial motors in a variety of applications. The relay includes 1NO + 1NC auxiliary contacts for control and signalling circuits and is designed for use with compatible Lovato contactors.
Key Advantages
- Reliable thermal motor overload protection for industrial applications.
- 12–18 A adjustable current range for accurate motor protection.
- Three-pole design suitable for three-phase motor circuits.
- Class 10A tripping characteristic for motor overload protection.
- Manual or automatic reset functionality for flexible operation.
- Integrated auxiliary contacts for control and fault signalling.
Key Features
- Lovato RFN38 motor protection relay series.
- 12–18 A adjustable operating current.
- Three-pole thermal overload protection.
- Class 10A tripping characteristic.
- Manual or automatic reset mode.
- Integrated test button and trip indicator.
- 1NO + 1NC auxiliary contacts for control and signalling.
- 690 V rated insulation voltage.
- 6 kV rated impulse withstand voltage.
Reliable Motor Protection for Industrial Systems
Thermal motor protection relays such as the Lovato RFN381800 monitor motor current and help prevent damage caused by prolonged overload conditions. Correctly adjusting the relay to the motor's rated current provides effective protection against overheating and excessive current.
The RFN38 series is designed for industrial motor control applications requiring dependable overload protection, flexible resetting and reliable auxiliary signalling. The RFN381800 provides a compact solution for protecting motors in machinery, automation equipment and electrical control panels.
Typical Applications
- Industrial motor control panels.
- Pumps and ventilation equipment.
- Conveyor and material handling systems.
- Production and processing machinery.
- Industrial automation equipment.
- OEM motor starter assemblies.
Technical Specifications
Tick the specs you need, then view products that match.
| Current Range | 13–18 A | |
|---|---|---|
| Compatible With | BF09–BF38 | |
| Device Type | Thermal Overload Relay | |
| Load Voltage | 690 V | |
| Monitored Supply | Single-phase | |
| Reset Type | Manual or automatic | |
| Monitoring Function | Temperature / thermistor | |
| Contacts | 1NO + 1NC | |
| IP Rating | IP20 | |
| HS Code | 85364900 | |
| Manufacturer | Lovato Electric | |
| Series | RFN38 Motor Protection Relays | |
| Model | RFN381800 | |
| Product type | Thermal motor protection relay | |
| Number of poles | 3 | |
| Release type | Thermal | |
| Adjustable operating current | 12–18 A | |
| Tripping class | 10A | |
| Reset mode | Manual or automatic | |
| Auxiliary contacts | 1NO + 1NC | |
| Rated insulation voltage | 690 V | |
| Rated impulse withstand voltage | 6 kV | |
| Rated operational voltage | 690 V | |
| Operational frequency | 0–400 Hz | |
| Protection rating | IP20 | |
| Mounting type | Direct mounting on compatible Lovato contactors |
Frequently Asked Questions
What is the Lovato RFN381800 used for?
The RFN381800 is a thermal motor protection relay designed to protect three-phase motors against overload conditions in industrial motor control applications.
What current range does the RFN381800 support?
The relay has an adjustable operating current range of 12–18 A.
What tripping class does the RFN381800 use?
The RFN381800 uses a class 10A tripping characteristic for thermal motor overload protection.
What auxiliary contacts are included?
The RFN381800 includes 1NO + 1NC auxiliary contacts for control and signalling functions.
What reset options does the RFN381800 provide?
The relay supports both manual and automatic reset modes to suit different motor control requirements.
Trusted by Industrial Control Engineers
Lovato RFN38 thermal motor protection relays provide adjustable overload protection, reliable operation and integrated control features for industrial motor starter applications.
