S series industry power supply S-250W

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 industry power supply S-250W

The S series industry power supply S-250W is part of the ELEHPD S Series range. 250W Switching power supply Features: • AC input range selectable by switch • Protections:Short circuit/Over load • Forced air cooling by built-in DC fan • 100% full load burn-in test • Fixed switching frequency at 60KHz • Low cost • High reliability • 2 years warranty SPECIFICATION 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

250W Switching power supply

Features :

• AC input range selectable by switch

• Protections:Short circuit/Over load

• Forced air cooling by built-in DC fan

• 100% full load burn-in test

• Fixed switching frequency at 60KHz

• Low cost

• High reliability

• 2 years warranty

SPECIFICATION

Model	S-250-5	S-250-12	S-250-15	S-250-24	S-250-27	S-250-48
Output	DC Voltage	5V	12V	15V	24V	27V	48V
Rated Current	40A	18A	15A	10A	9A	5.2A
Current Range	0~40A	0~18A	0~15A	0~10A	0 ~ 9A	0 ~ 5.2A
Rated Power	200W	216W	225W	240W	243W	249.6W
Ripple & Noise (max.) Note.2	80mVp-p	120mVp-p	120mVp-p	120mVp-p	150mVp-p	200mVp-p
Voltage Adj. Range	4.75~5.5V	10.8~13.2V	13.5~16.5V	21.6~26.4V	24.3~29.7V	43.2~52.8V
Voltage Tolerance Note.3	±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	800ms, 50ms at full load
Hold time	19ms at full load
Input	Voltage Range	90 ~ 132VAC / 176 ~ 264VAC Selected by switch 248~370VDC
Frequency Range	47~63HZ
Efficiency(Typ.)	74%	79%	80%	81.5%	82%	82%
AC Current(Typ.)	4.8A/115VAC 2.8A/230VAC
Inrush Current (Typ.)	COLD START 45A/230VAC
Leakage Current	<2mA / 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 ~ 20.25V	27.6 ~ 32.4V
Protection type : Hiccup mode, recovers automatically after fault condition is removed
Environment	Working Temperature	-10 ~ +60°c (Refer to "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./1cycle, period for 60min. each along X, Y, Z axes
Safety & EMC (Note 4.)	Safety Standards	UL60950-1 approved
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/ 25°c / 70% RH
Others	MTBF	271.9K hrs min. MIL-HDBK-217F (25°c )
Dimension	21511550mm (LWH)
Packing	0.95Kg; 12pcs/12Kg/0.92CUFT
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(Unit:mm)

Frequently asked questions about the S series industry power supply S-250W

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.