Rotary switch Eltako 20000175, 1P, 230 V AC, 16 A, blue, 18 mm wide

Eltako 20000175 is a compact single-pole rotary switch for 230 V AC installations, rated for a continuous current of 16 A. Housed in a blue modular enclosure 18 mm wide and 58 mm deep, it is designed for DIN-rail (TH35) mounting and panel applications where a small manual selector with phase and voltage monitoring functions is required. The device provides one change-over contact (potential-free) with a maximum switching capacity for resistive loads and lamp loads, supports monitoring of 1 to 3 phase conductors and neutral, and signals voltage presence and phase errors via an integral LED.

Advantages

The rotary switch integrates manual selection with automatic voltage and rotating-field monitoring, offering configurable operate and dropout voltage thresholds and an adjustable release delay. Its modular width of 18 mm saves installation space in distribution panels; low standby loss (approx. 0.8 W) reduces continuous power draw. The unit is suitable for direct switching of incandescent and LED lamp loads within the stated limits and provides clear LED indications for voltage present, phase loss or wrong polarity in multi-phase modes.

Suitable for

Key specifications

How to use

Mount the Eltako rotary switch on a TH35 DIN-rail and connect the supply conductor(s) and neutral according to the installation schematic and applicable wiring regulations. Use the front rotary switches to select the number of monitored phase conductors and to choose the desired operate/dropout voltage threshold (U1 or U2). Set the upper rotary switch to adjust the release delay between 0.1 and 8 seconds. The LED indicates when voltage is present; in 2- or 3-phase modes a rapidly flashing LED shows wrong polarity or a missing phase conductor. Ensure the device is protected by a suitable external fuse or circuit breaker not exceeding 16 A.

Recommendations

Install and commission this device only by a qualified electrician and follow national wiring regulations and safety standards. Verify lamp and load types do not exceed the stated wattage limits. Use U2 setting where compliance with VDE 0100 part 718 (former VDE 0108 part 1) is required for higher operate voltage, and select appropriate release delay to avoid nuisance switching on transient disturbances.