Ultra thin Single Output DC Switching power

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 Ultra thin Single Output DC Switching power

The Ultra thin Single Output DC Switching power is part of the ELEHPD MS Series range. 20W Ultra thin Single Output Switching power supply 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: 20W Ultra thin Single Output 5V 12V 24V DC Switching power supply for LED Strip light 90V-260V AC Input

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 MS 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

20W Ultra thin Single Output Switching power supply

Features:

1.100% full load burn-in test.

2.1 years warranty.

3. High property price

4.High quality as same as made in Europe or America.

Specification:

full range input switching power supply

Model	SMB-20-5	SMB-20-12	SMB-20-15	SMB-20-24
output	DC voltage	5V	12V	15V	24V
Voltage tolerance	±1%	±1%	±1%	±1%
Rated current	4A	1.67A	1.33A	0.84A
Current range	0~4A	0~1.67A	0~1.33A	0~0.84A
Rated power	20W	22W	20.5W	22W
Ripple&noise	50mvp-p	50mvp-p	50mvp-p	50mvp-p
DCvoltage ADJ.range	-9%~+10%	±10%	±10%	±10%
input	Voltage range
frequency	47~63HZ
AC current	0.25A/115VAC,0.15A/230VAC
efficiency	77%	79%	79%	81%
Inrush current	Cold start current 15A/115VAC,30A/230VAC
Leakage current	< 0.25mA/240VAC
protection	overload
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
protection type:hiccup mode,auto-recovery after fault condition is removed
Over temperature	When temperature of transistor inner node is over 150°C, start over temperature protection
protection type:hiccup mode,auto-recovery after temperature become normal
environment	Working temp,humidity
Storagetemp,humidity	-20°C~+85°C,10%~95%RH non-condensing
Withstand vibration	10~500HZ,2G 10min/1cycle,period for 60 minutes,each axes
safety	Withstand voltage
Isolated resistance	I/P-O/P,I/P-FG,O/P-FG:100M ohms/500VDC
Fitstandard	Safety standard
DIMENSION	L95.6W58H25mm

Frequently asked questions about the Ultra thin Single Output DC Switching power

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.