Voltage Monitoring Relay E3YF400V02 0.85 – Undervoltage Monitoring for 3-Phase Networks
The E3YF400V02 0.85 from TELE is a voltage monitoring relay from the ENYA series for reliable undervoltage monitoring in 3-phase networks according to VDE 0108-100 and VDE 0100-718. The device continuously monitors the voltage of each phase against the neutral conductor and protects electrical systems from the consequences of impermissible voltage drops.
The supply voltage also serves as the measurement voltage, eliminating the need for an additional auxiliary voltage. If the voltage of a phase falls below the fixed switching threshold of 195.5 V (L-N), the relay reliably switches off. The fixed hysteresis prevents unwanted switching operations during momentary voltage fluctuations.
Two potential-free changeover contacts with a switching capacity of up to 5 A at 250 V AC are available for signaling. A green LED indicates the supply voltage, while the yellow LED signals the switching status of the output relay.
With its compact width of 35 mm and DIN rail mounting, the monitoring relay is ideal for control cabinets, safety power supplies, and industrial and building technology applications.
Your advantages at a glance
- Undervoltage monitoring for 3-phase networks
- Rated voltage 3(N)~ 400/230 V AC
- Fixed switching threshold at 195.5 V (L-N)
- 2 changeover contacts (2 CO)
- Switching current up to 5 A
- Supply voltage = Measurement voltage
- Fixed trip delay of approx. 200 ms
- LED display for supply and output
- Compact design with 35 mm width
- DIN rail mounting
Typical applications
- Safety power supplies
- Emergency lighting systems
- Control cabinet manufacturing
- Power distribution systems
- Building automation
- Mechanical and plant engineering
- Voltage monitoring in 3-phase networks
