75W Single group rail type Switching power supply

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 75W Single group rail type Switching power supply

The 75W Single group rail type Switching power supply is part of the ELEHPD DR Series range. Smps Features:·universal AC input ·Small volume,low weight,high efficiency ·Protections:short circuit/over load/over voltage ·cooling by free air convectio ·can be installed on DIN rail: TS-35/7.5or TS-35/15 ·LED indicator for power on ·100% full load burn-in test ·2 Year warranty Data 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 DR 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

75W Single group rail type switching power supply smps

Features:·universal AC input

·Small volume,low weight,high efficiency

·Protections:short circuit/over load/over voltage

·cooling by free air convectio

·can be installed on DIN rail: TS-35/7.5or TS-35/15

·LED indicator for power on

·100% full load burn-in test
·2 Year warranty
Data sheet

Model	DR-75-12	DR-75-24	DR-75-48
output	DC voltage	12V	24V	48V
Voltage tolerance	±2%	±1%	±1%
Rated current	6.3A	3.2A	1.6A
Current range	0~6.3A	0~3.2A	0~1.6A
Rated power	76W	76.8W	76.8W
Ripple&noise	100mvp-p	150mvp-p	200mvp-p
DCvoltage ADJ.range	-9%~+10%	±10%	±10%
input	Voltage range	90~264VAC,127~373VDC
frequency	47~63HZ
AC current	1.6A/110VAC,0.96A/220VAC
efficiency	79%	81%	84%
Inrush current	Cold start current 20A/115VAC,40A/230VAC
Leakage current	< 1mA/240VAC
protection	Over load	Rated output power105%~150% start over load protection
protection type:hiccup mode,auto-recovery after fault condition is removed
over voltage	15.6~17.8V	30.6~33.2V	54.8~56.6V
protection type:cut off output voltage,diode clamp
environment	Working temp,humidity	-20°C~+60°C,20%~90%RH
Storagetemp,humidity	-40°C~+85°C,10%~95%RH non-condensing
Withstand vibration	10~500HZ,2G 10min/1cycle,period for 60 minutes,each axes
safety	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
Fitstandard	Safety standard	Fit UL1012
EMC standard	comply with EN55022,CLASSA
others	Dimension	55.5125.2100mm (LWH)
Weight/packing	0.3kg/45pcs/13.2KG
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.

Frequently asked questions about the 75W Single group rail type Switching power supply

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.