Slim Size Lrs DC Switching Power Supply for

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 Slim Size Lrs DC Switching Power Supply for

The Slim Size Lrs DC Switching Power Supply for is part of the ELEHPD LRS Series range. Slim Size Lrs DC Switching Power Supply for from the ELEHPD LRS Series range. ELEHPD manufactures and exports low voltage electrical products from Yueqing, Zhejiang, China, supplying distributors, panel builders, M&E contractors and OEM buyers worldwide.

Full catalogue description: Slim Size Lrs 75W 12V 24V DC Switching Power Supply for LED Industrial Equipment Single Output

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 LRS 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

Slim Size Lrs 75W 12V 24V DC Switching Power Supply for LED Industrial Equipment Single Output

SPECIFICATION
OUTPUT
Model	LRS-75-5	LRS-75-12	LRS-75-15	LRS-75-24	LRS-75-36	LRS-75-48
DC Voltage	5V	12V	15V	24V	36V	48V
Rated Current	14A	6A	5A	3.2A	2.1A	1.6A
Current Range	0~14A	0~6A	0~5A	0~3.2A	0~2.1A	0~1.6A
Rated Power	70W	72W	75W	76.8W	75.6W	76.8W
Ripple & Noise	100mVp-p	120mVp-p	120mVp-p	150mVp-p	200mVp-p	200mVp-p
Voltage Adj. Range	4.5 ~ 5.5V	10.2~ 13.8V	13.5~18V	21.6~28.8V	32.4~39.6V	43.2~52.8V
Voltage Tolerance	±2.0%	±1.0%	±1.0%	±1.0%	±1.0%	±1.0%
Line Regulation	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
Load Regulation	±1.0%	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
Setup, Rise Time	500ms, 30ms/230VAC 500ms, 30ms/115VAC at full load
Hold Up Time	60ms/230VAC 12ms/115VAC at full load
Voltage Range	85 ~ 264VAC 120 ~ 373VDC
Frequency Range	47 ~ 63Hz
Efficiency	86.5%	89%	89%	90%	91.5%	91.5%
AC Current	1.4A/115VAC 0.85A/230VAC
Inrush Current	Cold start 50A/230VAC
Leakage Current	<0.75mA / 240VAC
Over Load	110 ~ 150% rated output power
Protection type: Hiccup mode, recovers automatically after fault condition is removed
Over Voltage	5.75~6.75V	13.8 ~ 16.2V	18.75~21.75V	28.8 ~ 33.6V	41.4~48.6V	55.2~ 64.8V
Protection type: shut down o/p voltage, re-power on to recover
Working Temp.	-30 ~ +70ºC (Refer to "derating curve")
Working Humidity	20 ~ 90% RH non-condensing
Storage Temp., Humidity	-40 ~ +85ºC, 10 ~ 95% RH
Temp. Coefficient	±0.03%/ºC (0 ~ 50ºC)
Vibration	10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes
Safety Standards	UL60950-1, TUV EN60950-1, EN60335-1/-2-16, CCC GB4943 approved
Withstand Voltage	I/P-O/P:3.75KVAC I/P-FG:2KVAC O/P-FG:1.25KVAC
Isolation Resistance	I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25ºC / 70% RH
EMC Emission	Compliance to EN55022(CISPR22), GB9254 CLASS B, EN55014 EN 61000-3-2,-3
EMC Immunity	Compliance to EN61000-4-2,3,4,5,6,8,11, EN61000-6-2(EN50082-2), heavy industry level, criteria A
Dimension	998230mm (LWH)
Weight	0.3Kg
Packing	45pcs/carton/14.5kg/0.77CUFT
NOTE
1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25ºC of ambient temperature. 2. Ripple & 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. 4. Line regulation is measured from low line to high line at rated load. 5. Load regulation is measured from 0% to 100% rated load. 6. The power supply is considered a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets EMC directives. 7. Length of set up time is measured at cold first start. Turning ON/OFF the power supply very quickly may lead to increase of the set up time.

Frequently asked questions about the Slim Size Lrs DC Switching Power Supply for

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.