Lovato SM3R9900 motor protection circuit breaker with adjustable 80-100 A thermal setting, 100 A rated current and 50 kA breaking capacity at 400 V AC.
£396.69
The Lovato SM3R9900 is a heavy duty motor protection circuit breaker engineered to provide reliable thermal and magnetic protection for industrial motors. As part of the Lovato SM3R motor protection circuit breaker series, it combines overload protection, short-circuit protection and manual motor isolation in one compact, high performance device.
Featuring an adjustable thermal trip range of 80-100 A and a 100 A rated current, the SM3R9900 is ideal for protecting larger three-phase motors used in industrial machinery, pumps, compressors, conveyors and process equipment. Its 50 kA breaking capacity at 400 V AC provides dependable fault interruption for demanding industrial installations.
The SM3R9900 incorporates thermal and magnetic trip protection, phase failure sensitivity and a rotary operating handle, while maintaining compatibility with the extensive range of Lovato SM series accessories including auxiliary contacts, shunt trips, undervoltage releases and door coupling handles.
Motor protection circuit breakers combine overload and short-circuit protection with manual isolation, providing a compact solution for safeguarding industrial motors. They reduce installation complexity while improving equipment reliability and operational safety.
The Lovato SM3R9900 is designed for demanding industrial environments where high current motor protection, dependable fault interruption and long service life are essential. It is particularly suited to larger motors used in manufacturing, material handling and process industries.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | SM3R |
| Model | SM3R9900 |
| Product type | Motor protection circuit breaker |
| Thermal trip adjustment range | 80-100 A |
| Rated current (In) | 100 A |
| Number of poles | 3 |
| Protection type | Thermal and magnetic |
| Phase failure detection | Yes |
| Breaking capacity (Icu) | 50 kA at 400 V AC |
| Rated operating voltage | 230-690 V AC |
| Rated frequency | 50 / 60 Hz |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Magnetic trip | 13 × In |
| Control type | Rotary knob |
| Connection type | Screw terminals |
| Protection rating | IP20 |
| Mounting | DIN rail / panel mounting |
| Weight | Approx. 2.3 kg |
| Standards | IEC/EN 60947-1, IEC/EN 60947-2, IEC/EN 60947-4-1, UL508, CSA C22.2 No.14 |
| Certifications | cULus, EAC |
| HS Code | 85362090 |
The SM3R9900 protects three-phase motors against overloads, short circuits and phase failure while also providing manual switching and isolation.
The thermal overload setting is adjustable between 80 A and 100 A, with a rated current of 100 A.
The SM3R9900 provides an IEC rated short-circuit breaking capacity of 50 kA at 400 V AC.
Yes. The SM3R9900 incorporates phase failure sensitivity alongside thermal and magnetic protection to help safeguard connected motors.
Yes. It is compatible with Lovato SM series auxiliary contacts, shunt trip releases, undervoltage releases and door coupling handles.
Lovato SM3R motor protection circuit breakers are trusted by panel builders, OEM machine manufacturers and automation engineers worldwide for dependable motor protection, high fault interruption performance and long-term operational reliability.
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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...
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...