Automatic phase switch APM-20 EXT10000227

Automatic phase switch – power continuity and installation protection

The APM-20 automatic phase switch is a device designed to ensure uninterrupted power supply to single-phase receivers in the event of a voltage failure or drop in one of the phases of a three-phase network. This minimizes the risk of downtime and damage to equipment, especially sensitive to voltage fluctuations. The switch automatically selects the phase with correct parameters, guaranteeing stable operation of connected devices.

Application and functionality

APM-20 is an ideal solution for both installers and end-users. Mounting on a TH-35 rail simplifies integration with the existing distribution board, and compact dimensions (90 x 35 x 65 mm) allow for space saving. The device is particularly useful in places where power continuity is crucial, e.g. in workshops, homes with sensitive electronic equipment or in home automation systems. Built-in LEDs indicate the status of each phase, which facilitates diagnostics and control of the device's operation.

Key features and benefits

• Automatic phase switching: Guarantee of power continuity even with the failure of one phase.
• True RMS measurement: Precise voltage measurement, even for distorted waveforms – ensures reliable operation in various network conditions.
• Fast response: Switching time of 150 ms minimizes power interruptions.
• Factory-set parameters: Simplified installation and start-up – no additional configuration required (switching threshold 180 V AC, hysteresis 10 V AC).
• High load capacity: Maximum output load up to 16A (AC1) allows connection of most standard single-phase receivers.
• Contact protection: Internal contact arrangement provides resistance to contact welding and protects against interphase short circuits.
• Compact dimensions: 2 module width allows for easy mounting in standard distribution boards.

Technical specifications (indicative data)

The device operates in a three-phase network L1-L2-L3 (phase L1 prioritized), and its operation is based on a rated voltage of 230V AC. The degree of protection IP20 provides protection against touching with a finger and against the access of solid objects to the inside of the device. The switch is designed to operate at an ambient temperature from -20°C to +45°C. The maximum relay power is 4000 VA at a current of 16A and a voltage of 250V AC. The device has 1NO/NC contacts, which allows for various applications depending on the needs of the electrical installation.