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

• Manual on/off and multi-position switching in residential distribution boards
• Selection and monitoring of single-phase and multi-phase circuits in light commercial installations
• Lighting circuits with incandescent or LED lamps within the specified load limits
• Applications requiring compact DIN-rail mounted selectors with phase/voltage supervision

Key specifications

• Type: single-pole rotary switch with one change-over (CO) contact, potential-free
• Rated voltage: 230 V AC (supply voltage L1-N 180–250 V / 50 Hz)
• Rated current / maximum fusing: 16 A
• Contact switching capacity: 10 A / 250 V AC (potential-free contact specification)
• Lamp loads: up to 200 W for LED lamps, up to 2000 W for incandescent lamps
• Dimensions: 18 mm wide, 58 mm deep; 1 module for TH35 DIN-rail mounting
• Voltage monitoring: monitors 1 to 3 phase conductors and neutral; rotating-field monitoring in 2Ph/3Ph positions
• Adjustable voltage thresholds: two settings (U1: dropout 161 V / operate 185 V; U2: dropout 196 V / operate 206 V) per VDE requirements
• Delays: operate delay 0.5 s; adjustable release delay 0.1–8 s
• Indicators: LED for voltage applied; fast flashing indicates wrong polarity or missing phase in 2- or 3-phase mode, slow flashing during release delay
• Standby loss: approx. 0.8 W

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.

Usage 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.