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The Siemens SINOVA 3MU7 thermal overload relay (3MU7110-0EA0) offers reliable motor protection in industrial and commercial applications. It senses excess motor current caused by overload or stall conditions and trips to prevent damage. This mechanical relay features Class 10 trip characteristics for well-timed response to overcurrent, adjustable operating range of 0.63 A to 1 A, and mechanically mounts onto Siemens 3MT7 contactor frames (Sizes 0, 1, 2). The relay provides both manual and automatic reset options and includes a tripped status indicator. Its sturdy screw-terminal connections (main and auxiliary) support robust power and signaling wiring. Designed in accordance with common motor protection standards and coordinated with type-2 short-circuit protection, it ensures dependable protection with straightforward installation and integration into control panels
| Specification Category | Details |
|---|---|
| Product Name | Siemens 3MU7 Thermal Overload Relay |
| Model / Order No. | 3MU7110-0EA0 |
| Series | SINOVA 3MU7 |
| Function | Thermal overload protection for motors |
| Current Setting Range | 0.63 A to 1.0 A |
| Trip Class | Class 10 |
| Mounting Type | For mounting on 3MT7 contactors (Sizes 0, 1, 2) |
| Contact Configuration | 3-pole main circuit |
| Main Circuit Connections | Screw-type terminal connections |
| Auxiliary Contacts | 1 NC + 1 NO (for trip signaling and contactor disconnection) |
| Operating Voltage (Main) | Up to 690 V AC |
| Operational Frequency | 50–60 Hz |
| Rated Operating Current | 1 A (AC-3 at 400 V) |
| Motor Protection Power (AC-3) | ~0.25 kW at 400 V |
| Surge Voltage Resistance | 6 kV |
| Insulation Voltage (Pollution Degree 3) | 690 V |
| Ambient Temp. (Operating) | −5 °C … +55 °C |
| Ambient Temp. (Storage) | −25 °C … +70 °C |
| Mounting Orientation | ±22.5° forward/backwards and ±90° rotation |
| Termination | Screw terminals (main and auxiliary) |
| Weight | ~0.175 kg |
| IEC/Standards Compliance | IEC 60947 and other motor protection standards |
| Trip Indication | Mechanical trip indicator |
| Reset | Manual or automatic reset capability |