S single output switching power supply PSU

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 single output switching power supply PSU

The S single output switching power supply PSU is part of the ELEHPD S Series range. Features: • AC input range selected by switch • Protections:Short circuit/Over load • Cooling by free air convection • LED indicator for power on • Fixed switching frequency at 37KHz • 2 years warranty 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: S single output switching power supply 48V PSU 35W 12V 24V 5v s-35w

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

S single output switching power supply 48V PSU 35W 12V 24V 5v s-35w

Features :

• AC input range selected by switch

• Protections:Short circuit/Over load

• Cooling by free air convection

• LED indicator for power on

• Fixed switching frequency at 37KHz

• 2 years warranty

Model	S-35-5	S-35-12	S-35-15	S-35-24
Output	DC Voltage	5V	12V	15V	24V
Rated Current	7A	3A	2.4A	1.5A
Current Range	0~7A	0~3A	0~2.4A	0~1.5A
Rated Power	35W	36W	36W	36W
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	200ms, 100ms, 30ms at full load
Input	Voltage Range	85 ~ 132VAC / 170 ~ 264VAC selected by switch 240 ~ 370VDC
Frequency Range	47~63HZ
Efficiency(Typ.)	70%	76%	78%	78%
AC Current	0.8A/115VAC 0.45A/230VAC
Inrush Current (max.)	COLD START 18A/115VAC 36A/230VAC
Leakage Current	<2mA / 240VAC
Protection	Over Load	105 ~ 150% rated output power
Protection type : Fold back current limiting, 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	Design refer to UL1012
Withstand Voltage	I/P-O/P:1.5KVAC 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	Design refer to FCC Part15 J Conduction Class B
Others	MTBF	435.2K hrs min. MIL-HDBK-217F (25°c )
Dimension	1299838mm (LWH)
Packing	0.41Kg; 30pcs/13.4Kg/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.

OVERALL DIMENSION

Frequently asked questions about the S single output switching power supply PSU

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.