Lovato SM1R0040 motor protection circuit breaker with adjustable 0.25 to 0.40 A thermal protection, 100 kA breaking capacity and rotary knob operation.
£66.99
The Lovato SM1R0040 is a compact and dependable motor protection circuit breaker designed to protect three-phase motors against overloads, short circuits and phase failure conditions. As part of the Lovato SM1R series, it combines thermal and magnetic protection with a rotary knob operating mechanism, providing reliable motor protection for industrial machinery and automation systems.
This manual motor starter features an adjustable thermal protection range of 0.25 to 0.40 A, making it ideal for protecting small motors in precision machinery, OEM equipment and industrial control panels. Its high short-circuit breaking capacity and UL Type E certification provide dependable performance in demanding applications.
With a rated current of 0.40 A, a 3-pole design and an impressive 100 kA breaking capacity at 400 V AC, the SM1R0040 delivers excellent protection while remaining compact enough for installation on standard DIN rails within electrical enclosures.
Motor protection circuit breakers such as the Lovato SM1R0040 help prevent motor damage by disconnecting the circuit during overload, short-circuit or phase failure conditions. This improves equipment reliability while reducing maintenance costs and unplanned downtime in industrial installations.
The SM1R range is designed for machine builders, panel manufacturers and maintenance engineers requiring compact, reliable and easy-to-install motor protection devices for industrial control systems.
| Phase | Three Phase |
|---|---|
| Manufacturer | Lovato Electric |
| Series | SM1R |
| Model | SM1R0040 |
| Product type | Motor protection circuit breaker |
| Rated current | 0.40 A |
| Thermal trip adjustment range | 0.25 to 0.40 A |
| Number of poles | 3 |
| Type of protection | Magnetic and thermal |
| Type of control | Rotary knob |
| Short-circuit breaking capacity (Icu) | 100 kA at 400 V AC |
| Rated insulation voltage (Ui) | 690 V AC |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Frequency | 50 / 60 Hz |
| Tripping class | 10A |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Weight | approx. 278 g |
| HS Code | 85362010 |
The Lovato SM1R0040 protects small three-phase motors against overloads, short circuits and phase failure.
The adjustable thermal protection range is 0.25 to 0.40 A.
The breaker provides a maximum short-circuit breaking capacity of 100 kA at 400 V AC.
Yes. It is designed for installation on a standard 35 mm DIN rail inside electrical control panels.
Yes. The breaker includes phase failure sensitive protection together with thermal and magnetic trip functions.
Lovato SM1R motor protection circuit breakers are trusted by machine builders, OEM manufacturers and industrial engineers for dependable motor protection, long service life and reliable performance in demanding automation applications.
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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...