Overview
The Maico TR0,4 is a compact 5-step control transformer designed for three-phase AC applications. This transformer provides flexible voltage selection across five discrete steps, making it ideal for controlling fan motors and HVAC systems where proportional speed control is required. With a maximum current rating of 0.4A and robust IP54 enclosure protection, the TR0,4 delivers reliable performance in industrial and commercial control cabinets.
Key Features
- 5-step selector switch for multi-voltage output control
- Three-phase AC input compatible (0–400V primary)
- Five selectable secondary voltages (105V, 0–150V, 0–190V, 0–250V, 0–400V)
- Maximum load current: 0.4A
- Integrated operating indicator light
- IP54 rated enclosure for protection against dust and moisture
Technical Specifications
- Primary Voltage: 0–400V three-phase AC
- Secondary Voltages: 105V, 0–150V, 0–190V, 0–250V, 0–400V (switchable)
- Maximum Load Current: 0.4A
- Protection Rating: IP54
- Width: 248 mm
- Height: 195 mm
- Depth: 205 mm
- Operating Indicator: Yes, integrated light
- Switching Contact: 230V available for ancillary control (shutter, alarm, etc.)
Typical Applications
- Three-phase AC fan motor speed control and soft-starting
- HVAC system voltage regulation and step-down
- Industrial control cabinets requiring multi-step voltage selection
- Emergency exhaust and ventilation systems
- Equipment requiring stepped AC supply without full power electronics
Compatibility & Replacements
Compatible With
- Three-phase AC fan motors (0.4A maximum load)
- Standard 400V industrial power supplies
- Control cabinet DIN rail mounting (with optional accessories)
- Manual 5-step selector switches and control logic circuits
Replaces / Drop-In Replacement For
- Maico TR 0,4-1 (single-pole, base model)
- Maico TR 0,4-2 (two-pole variant with additional switching contacts)
- Legacy Maico TR0,4 models (article number 0157.0379)
Works With
- Maico DSS 20 5-step selector switch
- Manual control circuit designs and PLC relay modules
- Standard industrial 400V three-phase mains
- Analog or step-based motor speed control systems
