Fail Safe mode & Non-Fail Safe mode in eMPR

Question:

What is difference between Fail Safe mode & Non-Fail Safe mode in eMPR?

Answer:

Fail Safe Mode - A design mode where the relay is configured to take a safe action (usually tripping or alarming) if an internal failure or loss of power occurs.

Non-Fail Safe Mode - A mode where the relay does not automatically trip or change output status during an internal failure — it remains in its last known or de-energized state.

Purpose:

Fail Safe Mode - Ensures safety of equipment and personnel.

Non-Fail Safe Mode - Ensures continuity of power supply or operation.

Action on Internal Fault / Power Loss:

Fail Safe Mode - Output relay de-energizes and initiates a trip or alarm.

Non-Fail Safe Mode - Output relay remains unchanged or de-energizes without tripping.

Priority & Design Philosophy:

Fail Safe Mode - Safety is the top priority. “Trip on Failure”

Non-Fail Safe Mode - Availability (continuity of service) is the top priority. “Run on Failure”

Typical Applications:

Fail Safe Mode – Critical protection functions (e.g., generator, transformer, or breaker failure protection).

Non-Fail Safe Mode – Non-critical or monitoring applications (e.g., load shedding controllers, Utility loads, alarm & monitoring circuits, Lighting circuits).

• In our products eMPR150, eMPR300, eMPR300D & eMPR300I we have provision for both modes, Fail safe & Non-Fail safe mode.
• This selection is done using DIP switch.
• Relay will work only in one mode at a time depending upon DIP switch setting selected by operator.