NES SERIES POWER SUPPLY NES-350W

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 NES SERIES POWER SUPPLY NES-350W

The NES SERIES POWER SUPPLY NES-350W is part of the ELEHPD NES Series range. NES-350W HIGH EFFICIENCY SWITCHING POWER SUPPLY 350W Features: •Protections: Short circuit / Overload / Over voltage/ Over temperature •Forced air cooling by built-in DC fan •Withstand 300vac surge input for 5 second •Built-in cooling Fan ON-OFF control •Built-in constant current limiting circuit •100% full load burn-in test •LED indicator for power on •Fixed switching frequency at 90KHz •Low cost,high reliability • 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 NES 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

NES-350W HIGH EFFICIENCY SWITCHING POWER SUPPLY 350W
Features :

•Protections: Short circuit / Overload / Over voltage/ Over temperature

•Forced air cooling by built-in DC fan

•Withstand 300vac surge input for 5 second

•Built-in cooling Fan ON-OFF control

•Built-in constant current limiting circuit

•100% full load burn-in test

•LED indicator for power on

•Fixed switching frequency at 90KHz

•Low cost,high reliability

•2 years warranty

MODEL	NES-350-5	NES-350-12	NES-350-15	NES-350-24	NES-350-48
OUTPUT	DC voltage	5V	12V	15V	24V	48V
Voltage tolerance	±2%	±1%	±1%	±1%	±1%
Rated current	60A	29A	23.3A	14.6A	7.3A
Current range	0~60A	0~29A	0~23.3A	0~14.6A	0~7.3A
Rated power	300W	348W	349.5W	350.4W	350.4W
Ripple&noise	150mvp-p	150mvp-p	150mvp-p	150mvp-p	240mvp-p
DC voltage ADJ.range	-9%~+10%	±10%	±10%	±10%	±10%
INPUT	Voltage range	90~132VAC/180~264VAC(selected by switch),255~373VDC
frequency	47~63HZ
AC current	7A/115VAC,4A/230VAC
efficiency	80%	84%	84%	86%	87%
Inrush current	Cold start current 40A/115VAC,60A/230VAC
Leakage current	< 3.5mA/240VAC
PROTECTION	overload	Rated output power 105%~135% start over load protection
Protection type:hiccup mode,auto-recovery after fault condition is removed
Over voltage	6.8~8.2V	15.6~17.8V	18.6~20.8V	30.6~33.2V	54.8~56.6V
Protection type:hiccup mode,auto-recovery after fault condition is removed
Over temperature	≥50ºC fan on,≤45ºCfan off,≥95ºC±5ºC start over temperature protection
Protection mode:cutoff output,auto-recovery after temperature become normal
ENVIROMENT	Working temp,humidity	-20ºC~+60ºC,20%~90%RH
Storagetemp,humidity	-40ºC~+85ºC,10%~95%RH non-condensing
Withstand vibration	10~500HZ,2G 10min/1cycle,period for 60 minutes,each axes
SAFETY STANDARD& EMC	Withstand voltage	I/P-O/P:3KVAC I/P-FG:1.5KVAC O/P-FG:0.5KVAC
Isolated resistance	I/P-O/P,I/P-FG,O/P-FG:100M ohms/500VDC
Safety standard	DESIGN REFER TO UL1012
EMC standard	EN55022,CLASSA
OTHERS	Dimension	21511550mm (LWH)
Weight/packing	1.0kg/24pcs/25kg/0.049 m³/1.72CUFT
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.

Frequently asked questions about the NES SERIES POWER SUPPLY NES-350W

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.