Automatic phase switch pf-451 PF-451

Automatic Phase Switch – Reliable Power for Your Needs

This automatic phase switch, designated PF-451, is a key device ensuring continuity of power in the event of problems with one of the phases of the network. Designed for both direct connection and cooperation with contactors, it is a universal solution for installers and end-users. The device monitors voltages in the three-phase network and automatically switches to the phase with the best parameters, guaranteeing a stable power supply to connected receivers.

Functionality and Application

The PF-451 switch is particularly useful where power outages can cause significant losses or disruptions to equipment operation. It works perfectly in residential buildings, workshops, production plants, and anywhere that requires high power supply reliability. The ability to adjust the operating thresholds (lower 150-210V and upper 230-260V) allows for precise adaptation of the device to the specific operating conditions of the installation. The built-in undervoltage control and phase failure detection function further increase safety and protection of connected devices.

Key Features and Benefits

• Automatic Switching: Guarantees continuous power supply without manual intervention. In the event of a voltage drop on one phase, the switch automatically selects another, ensuring uninterrupted operation of connected devices.
• Application Flexibility: The ability to connect directly (up to 16A) or cooperate with contactors allows you to adapt the device to loads of different power. This gives great freedom in the design of electrical installations.
• Adjustable Operating Thresholds: Allow precise tuning of the device to specific electrical network conditions, minimizing the risk of unnecessary switching or failure to react to power problems.
• Voltage Quality Control: The undervoltage control function protects sensitive devices from damage caused by too low voltage.
• Optical Indication: An LED indicates the presence of power and the engaged phase, making diagnosis and monitoring of the device status easier.
• Compact Dimensions: Width 85 mm and height 75 mm allow for easy mounting on a 35 mm rail – it occupies only 5 module spaces.
• Safety: Protection against simultaneous application of voltages from two phases protects against interphase short circuits. The circuit will not switch to another contactor if the contactor contacts are short-circuited.

The device has a screw connection with a cross-section of 4.0 mm² which ensures a solid and safe connection of the wires. Power consumption does not exceed 1W, making it an energy-saving solution. The switch operates in a wide temperature range from -25°C to +50°C, guaranteeing its reliability in various environmental conditions.