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Digital Protection Relay Woodward MRD1T2HTL6M42

Digital Protection Relay Woodward MRD1T2HTL6M42

The Woodward MRD1T2HTL6M42, also cataloged as the MRD1T2HTL6M42 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: MRD1T2HTL6M42
Vendor: Woodward
Category: Digital Protection Relay
Related Series:

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The Woodward MRD1T2HTL6M42, also cataloged as the MRD1T2HTL6M42 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 MRD1T2HTL6M42
Brand Woodward
Origin USA
Weight 5.8 kg
Dimensions 144 mm x 72 mm x 130 mm
Operating Temp -20 deg C to +70 deg C
Power Consumption 24-270 VDC / 24-230 VAC Auxiliary Supply
Rated Current 1 A or 5 A (selectable)
Rated Frequency 50/60 Hz
Overcurrent Setting Range 0.5 to 20 x In
Earth Fault Current Range 0.01 to 2 x In
Time Delay Range 0.1 to 20 s
Output Contacts 4 changeover contacts (250 VAC, 8 A)
Storage Temp -40 deg C to +85 deg C
Humidity Up to 95% non-condensing

Actuator Loop Feedback Response and Thermal Dissipation Profiles

Driven by onboard digital signal processing algorithms, the MRD1T2HTL6M42 evaluates real-time current waveforms across 50/60 Hz power lines against configured overcurrent (0.5 to 20 x In) and earth fault (0.01 to 2 x In) thresholds. Fast signal acquisition maintains high-speed actuator loop feedback response when commanding external circuit breaker trip mechanisms via four 250 VAC / 8 A changeover output contacts. Internal power distribution circuits are engineered to maintain optimized thermal heat sink dissipation profiles across the wide 24-270 VDC and 24-230 VAC auxiliary supply range.

Frequently Asked Questions

Q: What auxiliary power supply ranges does the MRD1T2HTL6M42 relay accept?

A: The module accepts a wide universal auxiliary power input of 24-270 VDC or 24-230 VAC.

Q: What are the output contact ratings for protective trip execution?

A: The relay includes 4 changeover contacts rated for up to 250 VAC at an 8 A continuous resistive load.

Q: How are current secondary inputs configured on this protection unit?

A: The hardware features selectable secondary current transformer (CT) input channels supporting 1 A or 5 A nominal current (In).

Field Installation Guidelines

  • Fully isolate all auxiliary power supplies and secondary CT wiring prior to attaching or removing rear terminal connectors.
  • Short-circuit secondary current transformer (CT) terminals before disconnecting field wiring to prevent dangerous high-voltage inductive arcs.
  • Attach the protective earth (PE) grounding conductor directly to the primary panel earth grounding bar using low-impedance grounding hardware.
  • Secure panel cutout mounting brackets evenly to ensure correct mechanical seating of the 144 mm x 72 mm x 130 mm chassis.