Lrs SMPS Variable DC 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 Lrs SMPS Variable DC Power Supply for

The Lrs SMPS Variable DC Power Supply for is part of the ELEHPD LRS Series range. Lrs SMPS Variable DC 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: Lrs 100W SMPS Variable DC Power Supply for Industrial Equipment Supplies LED Switching Power Supply

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

SPECIFICATION
OUTPUT
Model	LRS-100-3.3	LRS-100-5	LRS-100-12	LRS-100-15	LRS-100-24	LRS-100-36	LRS-100-48
DC Voltage	3.3V	5V	12V	15V	24V	36V	48V
Rated Current	20A	18A	8.5A	7A	4.5A	2.8A	2.3A
Current Range	0~20A	0~18A	0~8.5A	0~7A	0~4.5A	0~2.8A	0~2.3A
Rated Power	66W	90W	102W	105W	108W	100.8W	110.4W
Ripple & Noise	100mVp-p	100mVp-p	120mVp-p	120mVp-p	150mVp-p	200mVp-p	200mVp-p
Voltage Adj. Range	2.97~3.6V	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	±3.0%	±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%	±0.5%
Load Regulation	±2.0%	±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	55ms/230VAC 10ms/115VAC at full load
INPUT
Voltage Range	85 ~ 264VAC 120 ~ 373VDC
Frequency Range	47 ~ 63Hz
Efficiency	84.50%	86%	88%	88.50%	90%	90.50%	91%
AC Current	1.9A/115VAC 1.2A/230VAC
Inrush Current	Cold start 50A/230VAC
Leakage Current	<0.75mA / 240VAC
PROTECTION
Over Load	110 ~ 150% rated output power
Protection type: Hiccup mode, recovers automatically after fault condition is removed
Over Voltage	3.8~4.45V	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
ENVIRONMENT
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 & EMC
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
OTHERS
Dimension	1299730mm (LWH)
Weight	0.34Kg
Packing	40pcs/carton/14.6kg/0.92CUFT
NOTE

Frequently asked questions about the Lrs SMPS Variable DC 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.