MDR POWER SUPPLY 20W

Q: What is the difference between a contactor and a relay?

A contactor is built for switching power circuits repeatedly at high current, often with motor duty ratings (AC-3) and arc-suppressing chambers. A relay switches control signals at low current. In practice: contactor for the motor, relay in the control circuit that drives the contactor coil.

Q: How do I calculate the correct contactor size for a motor?

Use the motor's full-load current, apply the AC-3 rating for the operating voltage, and allow for the number of starts per hour. As a rule of thumb, the contactor's AC-3 rating should be at least equal to the motor FLC, then step up one frame if the duty is heavy.

Q: Do you supply the coil voltage I need?

Coil voltages are specified per order. Send the model number, coil voltage and frequency you require and we will confirm availability and lead time.

Q: Are auxiliary contacts included?

Base models come with the standard auxiliary contact configuration for that frame. Add-on auxiliary blocks and mechanical interlocks can be quoted with the contactor.

About the MDR POWER SUPPLY 20W

The MDR POWER SUPPLY 20W is part of the ELEHPD MDR-Series range. MDR 20W DIN RAIL SWITCHING POWER SUPPLY Features 1. Universal AC input/ Full range 2. Installed on DIN rail TS35/ 7.5 OR 15 3. Protection: short circuit/ over-load/ over-voltage 4. No load power consumption <0.75W 5. LED indicator for power on 6. DC OK signal output (20W) 7. DC OK relay contact (40W&60W) 8. Cooling by free air condition 9. 100% full load burn-in 10. 2 years warranty 11. MDR-20-24 12V 1. ELEHPD manufactures and exports low voltage electrical products from Yueqing, Zhejiang, China, supplying distributors, panel builders, M&E contractors and OEM buyers worldwide.

Typical applications

Motor control centres and pump or fan starters
Machine building, conveyors, packaging and CNC equipment
HVAC control panels and building automation
Water treatment, irrigation and pumping stations
Panel retrofits replacing electromechanical control gear

How to specify the right MDR-Series

Size the contact rating for the inductive load, not just the resistive current (AC-3 duty for motors)
Check the coil voltage and frequency available in the panel: 24 V DC, 110 V, 230 V or 400 V AC
Confirm the auxiliary contact count needed for the control and indication circuit
Match the enclosure rating to the environment (IP20 inside a panel, IP65 on the machine)

Specifications

MDR 20W DIN RAIL SWITCHING POWER SUPPLY

Features

1. Universal AC input/ Full range

2. Installed on DIN rail TS35/ 7.5 OR 15

3. Protection: short circuit/ over-load/ over-voltage

4. No load power consumption <0.75W

5. LED indicator for power on

6. DC OK signal output (20W)

7. DC OK relay contact (40W&60W)

8. Cooling by free air condition

9. 100% full load burn-in

10. 2 years warranty

11. MDR-20-24 12V 1.67A 20W Din Rail Switching Power Supply

Specification

Model		MDR-20-5	MDR-20-12	MDR-20-15	MDR-20-24
Output	DC output Voltage	5V	12V	15V	24V
Voltage tolerance	±1.0%	±1.0%	±1.34%	±1.0%
Rated Current	3A	1.67A	0.67A	0.42A
Related Power	15w	20w	20w	24w
Wave&Noise	80mVp-p	120mVp-p	120mVp-p	150mVp-p
Voltage adjust range	4.75-5.5V	10.8-13.2V	13.5-16.5V	21.6-26.4V
Set up,rise time	500ms 30ms/230VAC 1000ms,30ms/115VAC at full load
hold up time	50ms/230VAC 20ms/115VAC at full load
Input	Voltage Range	85 ~ 264VAC 47-63HZ 120-370VDC
Input Current	0.55A/115VAC 0.35A/230VAC
Efficiency	77%	81%	81%%	84%
AC inrush current	Cold start current 35A/115V 70A/230VAC
Leakage current	<1mA/240VAC
Protection	Overload	Above 105%-160% rated output power
hiccup mode, recovery automatically after fault condistion is removed
Over voltage	5.75V-6.75V	13.8V-16.2V	17.25-20.25V	27.6-32.4V
Shut down o/p voltage, re-power on to recover
Function	DC OK active single	3.75-6V/50mA	9-13.5V/40mA	11.5-16.5V/40mA	18-27V/20mA
Environment	Working temp humidity	-20~+70°C 20%~90%RH
Stor temp, humidity	-20~+85°C 20%~90%RH Non-condensing
Safety	safety standards	UL508,TUV EN60950-1 approved
Withstand voltage	I/P-O/P:3KVAC I/P-FG:2KVA O/P-FG:0.5KVA
Isolation resistance	I/P-O/P,I/P-FG,O/P-FG:100M Ohms/500VDC/25 /70%RH
EMC emission	Compliance to EN55011,EN55022,EN61204-3 class B,EN61000-3-2,-3
Size	size	L22.5W90H100mm
Package	0.19kg,72pcs/15kg
Note:1.All parameters not specially mentioned are measured at 230VAC input, related load and 25 f ambient temperature.2.Wave&noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf&47uf parallel capacitor.3.Tolerance: includes set up tolerance, line regulation and load regulation.

Frequently asked questions about the MDR POWER SUPPLY 20W

What is the difference between a contactor and a relay?

A contactor is built for switching power circuits repeatedly at high current, often with motor duty ratings (AC-3) and arc-suppressing chambers. A relay switches control signals at low current. In practice: contactor for the motor, relay in the control circuit that drives the contactor coil.

How do I calculate the correct contactor size for a motor?

Use the motor's full-load current, apply the AC-3 rating for the operating voltage, and allow for the number of starts per hour. As a rule of thumb, the contactor's AC-3 rating should be at least equal to the motor FLC, then step up one frame if the duty is heavy.

Do you supply the coil voltage I need?

Coil voltages are specified per order. Send the model number, coil voltage and frequency you require and we will confirm availability and lead time.

Are auxiliary contacts included?

Base models come with the standard auxiliary contact configuration for that frame. Add-on auxiliary blocks and mechanical interlocks can be quoted with the contactor.