Honeywell 2MLR-DC42 24V DC Power Module

Honeywell 2MLR-DC42 Power Supply Module

Product Introduction

The Honeywell 2MLR-DC42 power supply module converts a nominal 24 VDC input into a stable 5 VDC output. This module provides up to 7.5A of output current, making it suitable for powering logic controllers, I/O racks, and field devices. Its input voltage range spans from 19.2 VDC to 28.8 VDC, which accommodates typical industrial DC bus variations.

Additionally, the 2MLR-DC42 achieves an efficiency of 65% or higher, reducing unnecessary heat generation. A built-in, non-replaceable input fuse protects the circuit on both AC and DC sides. The module also features a dedicated RUN contact that signals normal operation to a higher-level controller.

Technical Specifications

Input Ratings

• Rated input voltage: 24 VDC

• Input voltage range: 19.2 ~ 28.8 VDC

• Inrush current: 80A peak and lower

• Efficiency: 65% or higher

• Input fuse: Built-in (non-user-replaceable)

  • AC power: 250V / 3.15A (Time-lag type), UL approved

  • DC power: 125V / 10A (Time-lag type), UL approved

• Allowed instantaneous interruption: Within 20 ms

Output Ratings

• Output voltage: 5 VDC (±2%)

• Output current: 7.5A

• Output power: 37.5W @ 55℃

• Overcurrent protection: 9.0A ~ 17.0A

RUN Contact Specifications

• Purpose: RUN contact for status monitoring

• Rated switching voltage/current: 24 VDC, 0.5A

• Minimum switching load: 5 VDC, 1 mA

• Response time (Off→On): 10 ms or lower

• Response time (On→Off): 12 ms or lower

• Mechanical life: 20 million operations or more

• Electrical life: 100,000 operations or more at rated load

Indicators and Connections

• Voltage status display: LED on when output voltage is normal

• Cable specification: 0.75 ~ 2 mm²

• Available clamped terminal: RAV1.25-3.5, RAV2-3.5

Mechanical and Environmental Data

The Honeywell 2MLR-DC42 measures 55 x 95 x 110 mm (W x H x D). Its compact design fits easily into standard industrial cabinets. The module weighs only 417g, which minimizes mounting stress.

For secure wiring, use clamped terminals such as RAV1.25-3.5 or RAV2-3.5. The recommended cable cross-section ranges from 0.75 mm² to 2 mm². This flexibility allows you to match the wiring to your specific current requirements.

Installation Guidelines

First, verify that the input voltage remains within the 19.2 ~ 28.8 VDC range. Next, mount the 2MLR-DC42 securely on a DIN rail or panel using the provided mounting slots. Ensure proper clearance around the module for heat dissipation.

Then, connect the DC input wires to the appropriate terminals, observing correct polarity. For the output side, use 0.75 ~ 2 mm² cables terminated with RAV series clamps. After wiring, apply power and check the LED indicator. The LED must light up to confirm normal output voltage.

Finally, test the RUN contact by measuring continuity between its terminals. The contact should close when the output voltage is within specification.

Tip: Because the input fuse is not user-replaceable, always use an external overcurrent protection device upstream.

Packaging List

• 1 x Honeywell 2MLR-DC42 power supply module

• 1 x quick start guide (basic wiring diagram)

• 4 x mounting clips for DIN rail

Note: No cables, certificates, or warranty documents are included in this shipment.

Shipping

We ship all orders via FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours after dispatch. International delivery typically takes 3–7 business days.

Frequently Asked Questions (FAQ)

1. Can I replace the internal fuse of the Honeywell 2MLR-DC42 by myself?

No, the fuse is built-in and not user-replaceable. You must use an external circuit breaker or fuse rated appropriately for 24 VDC systems.

2. What happens if the output current exceeds 7.5A?

The overcurrent protection activates between 9.0A and 17.0A. It will shut down the output to prevent damage. After removing the overload, power-cycle the module to reset it.

3. How do I know if the module is working properly?

Check the voltage status LED on the front panel. If the LED is on, the 2MLR-DC42 outputs a normal 5 VDC. Additionally, monitor the RUN contact for closed status.

4. Is this power supply compatible with 120 VAC input?

No, the Honeywell 2MLR-DC42 accepts only DC input (19.2–28.8 VDC). Do not connect AC power to the input terminals. For AC applications, select a different Honeywell power supply model.

5. What cable size is recommended for the output terminals?

Use cables between 0.75 mm² and 2 mm². We recommend clamped terminals like RAV1.25-3.5 or RAV2-3.5 for reliable and vibration-resistant connections.