NES SERIES POWER SUPPLY NES-75W

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-75W

The NES SERIES POWER SUPPLY NES-75W is part of the ELEHPD NES Series range. NES-75W HIGH EFFICIENCY SWITCHING POWER SUPPLY 75W NES-75W Features: • Universal AC input/Full range • Protections: Short circuit / Overload / Over voltage • Cooling by free air convection • 100% full load burn-in test • 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.

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-75W HIGH EFFICIENCY SWITCHING POWER SUPPLY 75W NES-75W

Features :

•Universal AC input/Full range

•Protections: Short circuit / Overload / Over voltage

•Cooling by free air convection

•100% full load burn-in test

•2 years warranty

MODEL	NES-75-5	NES-75-12	NES-75-15	NES-75-24	NES-75-48
OUTPUT	DC VOLTAGE	5V	12V	15V	24V	48V
RATED CURRENT	14A	6.2A	5A	3.2A	1.6A
CURRENT RANGE	0-14A	0 ~ 6.2A	0-5A	0-3.2A	0-1.6A
RATED POWER	70W	74.4W	75W	76.8W	76.8W
RIPPLE & NOISE (max.) Note.2	80mVp-p	120mVp-p	150mVp-p	200mVp-p	240mVp-p
VOLTAGE ADJ. RANGE	4.75 - 5.5V	10.8-13.2V	13.5-16.5V	21.6-26.4V	43.2 - 52.8V
VOLTAGE TOLERANCE Note.3	±2.0%	±1.0%	±1.0%	±1.0%	±1.0%
LINE REGULATION Note.4	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
LOAD REGULATION Note.5	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
SETUP, RISE TIME	500ms, 30ms/230VAC 1200ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.)	50ms/230VAC 10ms/115VAC at full load
INPUT	VOLTAGE RANGE	85 ~ 264VAC 120-370VDC
FREQUENCY RANGE	47 - 63Hz
EFFICIENCY (Typ.)	77%	82%	83%	86%	87%
AC CURRENT (Typ.)	1.5A/115VAC 0.9 A/230VAC
INRUSH CURRENT (Typ.)	COLD START 45A
LEAKAGE CURRENT	<2mA/240VAC
PROTECTION	OVERLOAD	105 ~135%	110 ~ 150% rated output power
Protection type: Hiccup mode, recovers automatically after fault condition is removed
OVERVOLTAGE	5.75 ~ 6.75V	13.8-16.2V	17.25-20.25	27.6 - 32.4V	55.2 - 64.8V
Protection type: Shut down o/p voltage, re-power on to recover
ENVIRONMENT	WORKING TEMP.	-20 ~ +60°C (Refer to "Derating Curve")
WORKING HUMIDITY	20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY	-40 ~ +85°C, 10 ~ 95% RH
TEMP. COEFFICIENT	±0.03%/°C (0 ~ 45°C)
VIBRATION	10 ~ 500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes
SAFETY & EMC (Note 7)	SAFETY STANDARDS Note.6	UL60950-1, CB(IEC60950-1),CCC GB4943.1:2011 approved
WITHSTAND VOLTAGE	l/P-0/P:1.5KVAC l/P-FG:1.5KVAC 0/P-FG:0.5KVAC
ISOLATION RESISTANCE	l/P-O/P, l/P-FG, 0/P-FG:100M Ohms / 500VDC / 25°C/ 70% RH
EMC EMISSION	Compliance to EN55022 (CISPR22) Class B, EN61000-3-2,-3
EMC IMMUNITY	Compliance to EN61000-4-2,3,4,5,6,8,11, EN55024, EN61000-6-1, light industry level, criteria A
OTHERS	MTBF	378.2K hrs min. MIL-HDBK-217F (25°C)
DIMENSION	1599738mm (LWH)
PACKING	0.52Kg; 30pcs/16.6Kg/0.97CUFT

Frequently asked questions about the NES SERIES POWER SUPPLY NES-75W

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.