S series 12V 24V power supply S-40W

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 S series 12V 24V power supply S-40W

The S series 12V 24V power supply S-40W is part of the ELEHPD S Series range. 40W Single switching power supply 12v 24v 5v Features: • Universal AC input / Full range • Protections:Short circuit/Over load • Cooling by free air convection • 100% full load burn-in test • Fixed switching frequency at 36KHz • 2 years warranty PARAMETER SHEET 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 S 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

40W Single switching power supply 12v 24v 5v

Features :

• Universal AC input / Full range

• Protections:Short circuit/Over load

• Cooling by free air convection

• 100% full load burn-in test

• Fixed switching frequency at 36KHz

• 2 years warranty

PARAMETER SHEET

Model	S-40-5	S-40-12	S-40-15	S-40-24
Output	DC Voltage	5V	12V	15V	24V
Rated Current	8A	3.5A	2.8A	1.8A
Current Range	0~8A	0~3.5A	0~2.8A	0~1.8A
Rated Power	40W	42W	42W	43W
Ripple & Noise (max.) Note.2	75mVp-p	100mVp-p	100mVp-p	100mVp-p
Voltage Adj. Range	4.75~5.5V	10.8~13.2V	13.5~16.5V	21.6~26.4V
Voltage Tolerance Note.3	±2.0%	±1.0%	±1.0%	±1.0%
Line Regulation	±0.5%	±0.5%	±0.5%	±0.5%
Load Regulation	±1.0%	±0.5%	±0.5%	±0.5%
Setup,Rise, Hold time	300ms, 50ms, 60ms/230VAC 800ms, 50ms, 15ms/115VAC at full load
Input	Voltage Range	85 ~ 132VAC / 170 ~ 264VAC selected by switch 240 ~ 370VDC
Frequency Range	47~63HZ
Efficiency(Typ.)	72%/115VAC	76%/115VAC	76%/115VAC	78%/115VAC
AC Current	1.2A/115VAC 0.6A/230VAC
Inrush Current (max.)	COLD START 30A/115VAC 60A/230VAC
Leakage Current	<1mA / 240VAC
Protection	Over Load	105 ~ 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	17.25 ~ 20.25	27.6 ~ 32.4V
Protection type : Hiccup mode, recovers automatically after fault condition is removed
Environment	Working Temperature	-10 ~ +60°c (Refer to output load derating curve)
Working Humidity	20~90% RH Non-condensing
Storage temp.& humidity	-20~+85°C, 10~95%RH
Temp. coefficient	±0.03%/°C (0~50°C)
Vibration	10 ~ 500Hz, 2G 10min./1 cycle,60min.each along X,Y,Z axes
Safety & EMC (Note 4.)	Safety Standards	UL1012, UL1950, TUV EN60950 Approved
Withstand Voltage	I/P-O/P:3KVAC I/P-FG:1.5KVAC O/P-FG:0.5KVAC
Isolation Resistance	I/P-O/P, I/P-FG, O/P-FG:100M Ohms/500VDC
EMI Conduction & Radiation	Compliance to EN55022 (CISPR22) Class B
Harmonic Current	Compliance to EN61000-3-2,-3
EMS Immunity	Compliance to EN61000-4-2,3,4,5; ENV50204, EN55024, Light industry level, criteria A
Others	MTBF	314.1K hrs min. MIL-HDBK-217F (25°c )
Dimension	1299838mm (LWH)
Packing	0.41Kg; 30pcs/13.9Kg/0.86CUFT
Note	1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25°C 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. 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.

OVERALL DIMENSION

Frequently asked questions about the S series 12V 24V power supply S-40W

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.