Siemens MICROMASTER MM400 VFD 0.37kW 380-480V 3-Phase 6SE6420-2UD13-7AA1

Siemens MM400 VFD 0.37kW – Ultra-Compact Drive for Micro Equipment

The Siemens MICROMASTER MM400, model 6SE6420-2UD13-7AA1, delivers 0.37kW output power – the smallest rating in the entire MM400 series. This micro drive is designed for precision equipment where every millimeter of cabinet space matters.

Key Specifications:
- Output Power: 0.37kW (constant torque)
- Input Voltage: 380-480V AC 3-phase, 50/60Hz
- Rated Output Current: 1.2A
- Built-in Filter: Class A
- Protection Class: IP20
- Operating Temperature: 0°C to 50°C
- Dimensions: 173mm × 73mm × 149mm
- Weight: 1.3kg

Typical Applications:
- Laboratory fume hood fans
- Micro conveyors (under 300mm width)
- Precision dosing pumps for pharmaceutical production
- Small packaging machine indexing drives
- Miniature mixing equipment

Why This Model?
This 0.37kW drive shares the same compact chassis as the 0.55kW and 0.75kW models (173mm height) but is optimized for low-end torque performance. Field measurements show speed regulation error under 0.5% across 15%-85% load range. For applications requiring frequent starts and stops, the built-in DC injection brake provides rapid deceleration without external components.

Selection Guide:
The 0.37kW is the entry point to the MM400 series. If your motor is rated 0.25kW-0.55kW, this is your most cost-effective choice. For motors above 0.55kW, move up to the 0.75kW model.

FAQ:

Q1: What is the smallest motor this drive can control?
A: It can drive motors as small as 0.12kW (1/6 HP) with proper parameter adjustment. The minimum output frequency is 0Hz with adjustable voltage boost for low-speed torque.

Q2: Does this model include a braking resistor?
A: No. Unlike larger MM400 models, the 0.37kW variant does not have a built-in braking transistor. For rapid deceleration applications, an external braking module is required.

Q3: Can I mount multiple units side by side?
A: Yes. The 73mm width allows 8 units per standard 600mm cabinet section. Maintain 50mm vertical clearance for airflow.

Q4: Is this suitable for conveyor applications?
A: Yes for light-load conveyors (packaging, assembly lines). Not recommended for heavy-load or high-inertia conveyors where the 0.55kW or 0.75kW would be more appropriate.

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