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RFN380400 – T/O RELAY2 5-4A MAN/AUTO
Lovato RFN380400 three-pole thermal motor protection relay with a 2.5–4 A adjustable current range, class 10A tripping characteristic and phase-failure-sensitive protection for industrial motor control applications.
£41.45
Why Choose the Lovato RFN380400 Motor Protection Relay?
The Lovato RFN380400 is a dependable thermal motor protection relay designed to protect three-phase motors against overload and phase-failure conditions in industrial motor control applications. As part of the Lovato RFN38 motor protection relay range, it combines adjustable thermal protection with integrated auxiliary contacts for effective motor starter control.
This three-pole thermal relay provides phase-failure-sensitive protection and a class 10A tripping characteristic, helping safeguard motors against sustained overload conditions. Its adjustable current setting allows the protection threshold to be matched to the motor being controlled, supporting reliable operation in machinery and automation systems.
With an adjustable operating current range of 2.5–4 A, the RFN380400 is suitable for a range of industrial motor protection applications. The relay incorporates 1NO + 1NC auxiliary contacts for signalling and control within motor starter circuits.
Key Advantages
- Reliable thermal motor overload protection for industrial applications.
- 2.5–4 A adjustable current range for matching protection to the motor.
- Three-pole design suitable for three-phase motor circuits.
- Phase-failure-sensitive operation provides additional motor protection.
- Class 10A tripping characteristic for motor overload applications.
- Integrated 1NO + 1NC auxiliary contacts for signalling and control.
Key Features
- Lovato RFN38 motor protection relay range.
- 2.5–4 A adjustable overload setting.
- Three-pole thermal overload protection.
- Phase-failure-sensitive design.
- Class 10A tripping characteristic.
- 1NO + 1NC integrated auxiliary contacts.
- 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 RFN380400 respond to sustained overcurrent conditions that can cause excessive motor heating and premature equipment failure. Correctly setting the relay to the motor's operating current helps provide effective overload protection within an industrial motor starter.
The RFN38 range is designed for motor control applications where reliable thermal protection, phase-failure sensitivity and auxiliary signalling are required. These characteristics make the RFN380400 suitable for integration into machinery, automation equipment and industrial electrical control systems.
Typical Applications
- Industrial motor control panels.
- Pumps, fans and ventilation equipment.
- Conveyor and material handling systems.
- Production and processing machinery.
- Industrial automation equipment.
- OEM motor starter and control assemblies.
Technical Specifications
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| Current Range | 2.5–4 A | |
|---|---|---|
| Device Type | Thermal Overload Relay | |
| Compatible With | BF09–BF38 | |
| Monitoring Function | Temperature / thermistor | |
| Monitored Supply | Single-phase | |
| Contacts | 1NO + 1NC | |
| HS Code | 85364900 | |
| Manufacturer | Lovato Electric | |
| Series | RFN38 Motor Protection Relays | |
| Model | RFN380400 | |
| Product type | Thermal motor protection relay | |
| Number of poles | 3 | |
| Adjustable current range | 2.5–4 A | |
| Tripping class | 10A | |
| Auxiliary contacts | 1NO + 1NC | |
| Auxiliary contact conventional thermal current | 10 A | |
| Rated insulation voltage | 690 V | |
| Rated impulse withstand voltage | 6 kV |
Frequently Asked Questions
What is the Lovato RFN380400 used for?
The RFN380400 is a thermal motor protection relay designed to protect three-phase motors against overload and phase-failure conditions in industrial motor control applications.
What current range does the RFN380400 support?
The relay has an adjustable operating current range of 2.5–4 A.
What tripping class does the RFN380400 use?
The RFN380400 has a class 10A tripping characteristic for thermal motor overload protection.
Does the RFN380400 provide phase-failure protection?
Yes. The RFN380400 is phase-failure sensitive, helping protect a three-phase motor when abnormal phase conditions occur.
What auxiliary contacts are included?
The RFN380400 incorporates 1NO + 1NC auxiliary contacts for use in motor starter control and signalling circuits.
Trusted by Industrial Control Engineers
Lovato RFN38 thermal motor protection relays provide adjustable overload protection, phase-failure sensitivity and integrated auxiliary contacts for dependable industrial motor control applications.
