The Tesla TESHRN-55 Voltage Monitoring Relay is designed to monitor phase sequence and detect phase failure in 3-phase mains. It ensures reliable system operation by identifying when monitored voltage levels are too high or too low. The relay includes fixed and adjustable delay times, giving you flexible control over response times. Powered by all three phases, it stays functional even if one phase fails. Clear LED indicators show power presence and fault conditions. With its compact design and DIN rail mounting, the TESHRN-55 fits easily into standard electrical setups.

• Phase sequence and failure monitoring. Checks for correct phase sequence and detects failure of any phase in 3-phase systems.
• Voltage monitoring. Operates within a 400V AC 3-phase range.
• Independent phase supply. Stays operational even if one phase is missing, powered by all three phases.
• Adjustable time delay. Fixed delay T1 at 500 ms and adjustable delay T2 from 0.1 to 10 seconds.
• LED status indicators. Green LED shows power presence; red LED signals fault conditions.
• DIN rail mounting. Compatible with standard DIN rails (EN 60715) for easy installation.
• Robust design. Operates in temperatures from -20°C to 55°C with IP40 front protection.

Q: What happens if the phase sequence is incorrect?
A: The red LED stays on continuously, and the relay remains open to prevent damage.

Q: Does it function if one phase fails?
A: Yes, the HRN-55 model stays operational even if a single phase is lost.

Q: What is the adjustable delay range?
A: T2 delay can be adjusted from 0.1 to 10 seconds using a front panel potentiometer.