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MRI3I5E5DM Digital Protection Relay Woodward

MRI3I5E5DM Digital Protection Relay Woodward

The Woodward MRI3I5E5DM, also cataloged as the MRI3 Digital Protection Relay, operates as a dedicated hardware component for current monitoring and overcurrent protection within electrical power distribution systems.

Hardware Specifications

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SKU: MRI3I5E5DM
Vendor: Woodward
Category: Digital Protection Relay
Related Series:

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The Woodward MRI3I5E5DM, also cataloged as the MRI3 Digital Protection Relay, operates as a dedicated hardware component for current monitoring and overcurrent protection within electrical power distribution systems.

Hardware Specifications

Parameter Specification
Model MRI3I5E5DM
Brand Woodward
Origin USA
Weight 0.8 kg
Dimensions 144 mm x 72 mm x 130 mm
Operating Temp -20 to +70 deg C
Power Consumption 24-270 VDC or 24-230 VAC auxiliary range
Storage Temperature -40 to +85 deg C
Relative Humidity Up to 95%, non-condensing
Rated Current 1 A or 5 A (selectable)
Rated Frequency 50/60 Hz
Overcurrent Setting Range 0.5-20 x In
Time Delay Range 0.1-20 s
Earth Fault Current Range 0.01-2 x In
Output Contacts 4 changeover contacts (250 VAC, 8 A rating)

Actuator Loop Feedback Response and Overcurrent Protection

The Woodward MRI3I5E5DM utilizes high-speed digital signal processing to analyze selectable 1 A or 5 A current inputs and deliver deterministic actuator loop feedback response during fault conditions. By evaluating phase overcurrent levels across a 0.5-20 x In range and earth fault thresholds from 0.01-2 x In, the internal logic triggers its 4 changeover output contacts within user-defined time delays (0.1-20 s). This closed-loop monitoring ensures rapid trip signal generation to isolate upstream breakers and safeguard electrical distribution hardware.

Frequently Asked Questions

Q: What auxiliary power supply options are compatible with the Woodward MRI3I5E5DM?

A: The relay accepts a wide-range auxiliary voltage supply operating from 24 to 270 VDC or 24 to 230 VAC.

Q: What are the output contact ratings and relay configurations on this module?

A: The module is equipped with 4 changeover contacts rated for maximum switching capacities of 250 VAC at 8 A.

Q: What are the current input sensing ranges for phase overcurrent and earth fault monitoring?

A: The unit features selectable rated inputs of 1 A or 5 A, supporting overcurrent pickup settings from 0.5 to 20 x In and earth fault settings from 0.01 to 2 x In.

Field Installation Guidelines

  • Panel mount the 144 mm x 72 mm x 130 mm enclosure securely in a clean cutout, ensuring tight seal engagement against the cabinet door.
  • Connect auxiliary power lines within the allowable 24-270 VDC / 24-230 VAC parameters, verifying proper terminal isolation.
  • Wire CT secondary current lines (1 A or 5 A) using high-integrity terminal blocks, ensuring CT lines are never open-circuited while energized.
  • Maintain clear physical separation between current transformer sensing wires and high-voltage changeover relay output lines to prevent crosstalk and noise pickup.