Need a three-phase system to act as the central DC power supply of a larger plant or machine in a networked automation system? This stabilised power supply from Siemens' SITOP PSU3800 series provides a controlled, isolated output voltage of 24V DC from an input voltage of 400V to 500V AC. You can snap it onto a DIN rail or mount it flexibly using the screw terminals to make a secure electrical connection. A green LED indicator lets you know it's supplying the required voltage.

• IP20 (ingress protection) rating indicates the unit is touch-proof and resistant to dust
• Ambient temperature range of -25°C to +70°C means it's suitable for a wide variety of industrial conditions

Three-phase equipment, particularly electric motors, offers several advantages when compared with a single-phase system. They're more efficient, tend to create less vibration and can start without needing any external devices. You can run a single-phase device off a three-phase power supply by using only one of the conductors.