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11RF905 – T/O RELAY RF9 0.3-0.5A
Lovato 11RF905 is a three-pole, manually reset thermal motor protection relay with a 0.3–0.5 A adjustable current range, phase-failure sensitivity and direct mounting on BG06, BG09 and BG12 mini-contactors.
£36.26
Why Choose the Lovato 11RF905 Motor Protection Relay?
The Lovato 11RF905 is a three-pole thermal motor protection relay designed to protect three-phase motors against overload and phase-failure conditions. Its adjustable operational current range of 0.3–0.5 A enables accurate protection of low-current motor circuits.
This phase-failure-sensitive relay features manual resetting, tripping class 10A, a test button and a visible trip indicator. One normally open and one normally closed auxiliary contact are included for signalling and integration with control circuits.
The 11RF905 mounts directly onto Lovato BG06, BG09 and BG12 mini-contactors, supporting compact motor starter assemblies. Its 690 V rated operational voltage, IP20 frontal protection and broad operating-frequency range make it suitable for industrial control panels and machinery.
Key Advantages
- Adjustable 0.3–0.5 A operational current range.
- Thermal overload and phase-failure protection for three-phase motors.
- Direct mounting on BG06, BG09 and BG12 mini-contactors.
- Manual reset helps prevent unintended automatic restarting.
- Integrated test button and visible trip indicator.
- One normally open and one normally closed auxiliary contact.
Key Features
- Lovato 11RF9 motor protection relay series.
- Three-pole thermal release.
- 0.3–0.5 A adjustable operational current.
- Tripping class 10A.
- Phase-failure-sensitive operation.
- 690 V rated operational voltage.
- Manual reset, test button and trip indicator.
- 1 NO and 1 NC auxiliary contact.
- Direct mounting on Lovato BG-series mini-contactors.
- IP20 frontal protection.
Reliable Protection for Three-Phase Motors
Thermal motor protection relays monitor the current supplied to a motor and trip when a sustained overload creates a potentially damaging condition. Phase-failure sensitivity adds protection when one phase is lost, helping reduce the risk of motor overheating and premature equipment failure.
The Lovato 11RF905 combines an adjustable current setting with manual reset, auxiliary signalling contacts and direct contactor mounting. These features support compact, coordinated motor starter assemblies that are straightforward to test, monitor and maintain.
Typical Applications
- Protection of low-current three-phase motors.
- Motor starters using Lovato BG06 mini-contactors.
- Motor starters using Lovato BG09 mini-contactors.
- Motor starters using Lovato BG12 mini-contactors.
- Industrial machinery and automation systems.
- Electrical control panels and compact switchgear assemblies.
Technical Specifications
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| Current Range | 0.3–0.5 A | |
|---|---|---|
| Compatible With | BG06–BG12 | |
| Device Type | Thermal Overload Relay | |
| Load Voltage | 690 V | |
| Monitoring Function | Temperature / thermistor | |
| Monitored Supply | Single-phase | |
| Reset Type | Manual | |
| Contacts | 1NO + 1NC | |
| Manufacturer | Lovato Electric | |
| Series | 11RF9 | |
| Model | 11RF905 | |
| Product type | Thermal motor protection relay | |
| Number of poles | 3 | |
| Operational current | 0.3–0.5 A | |
| Type of release | Thermal | |
| Tripping class | 10A | |
| Phase-failure detection | Yes | |
| Reset mode | Manual | |
| Rated operational voltage | 690 V | |
| Rated insulation voltage | 690 V | |
| Rated impulse withstand voltage | 8 kV | |
| Operational frequency | 0–400 Hz | |
| Recommended gG protection fuse | 2 A | |
| Recommended aM protection fuse | 1 A | |
| Recommended UL RK5 protection fuse | 3 A | |
| Auxiliary contacts | 1 NO + 1 NC | |
| Frontal protection rating | IP20 | |
| Overvoltage category | III | |
| Pollution degree | 3 | |
| Power terminal type | Screw and washer, M4 | |
| Power terminal tightening torque | 2.3 Nm | |
| Operating temperature | -20 to +55 °C | |
| Storage temperature | -55 to +70 °C | |
| Maximum altitude | 3000 m | |
| Mounting type | Direct mounting on BG06, BG09 and BG12 mini-contactors | |
| Normal operating position | Vertical plane | |
| Weight | 116 g |
Frequently Asked Questions
What is the Lovato 11RF905 used for?
The Lovato 11RF905 protects three-phase motors against thermal overload and phase-failure conditions in compatible motor starter assemblies.
What is the current adjustment range of the 11RF905?
The relay has an adjustable operational current range of 0.3–0.5 A.
Which contactors are compatible with the Lovato 11RF905?
The relay is designed for direct mounting on Lovato BG06, BG09 and BG12 mini-contactors.
Does the 11RF905 detect phase failure?
Yes. The 11RF905 is phase-failure sensitive and helps protect a three-phase motor if one of its supply phases is lost.
How is the Lovato 11RF905 reset after tripping?
The relay uses manual resetting and also includes a test button and visual trip indicator.
Trusted Motor Protection from Lovato Electric
Lovato thermal motor protection relays provide dependable overload and phase-failure protection for industrial motors, combining adjustable settings, control-circuit signalling and direct integration with compatible contactors.
