Ultra-Thin Single Output 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 Switching Power

The Ultra-Thin Single Output Switching Power is part of the ELEHPD MS Series range. Features: 1) AC input range selected by switch. 2) Protections: Short circuit/Over load. 3) Cooling by free air convection. 4) 100% full load burn-in. 5) Lost cost. 6) 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.

Full catalogue description: 50W Ultra-Thin Single Output Switching Power Supply 12v 24v 5v

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

50W Ultra-Thin Single Output Switching Power Supply 12v 24v 5v
Features:
1) AC input range selected by switch.
2) Protections: Short circuit/Over load.
3) Cooling by free air convection.
4) 100% full load burn-in.
5) Lost cost.
6) High reliability.

Model		SMB-50-5	SMB-50-12	SMB-50-24	SMB-50-48
Output	DC output Voltage	5V	12V	24V	48V
Voltage tolerance	±1.0%	±1.0%	±1.0%	±1.0%
Rated Current	10A	4.2A	2.1A	1.0A
Related Power	50w	50w	50w	50w
Wave&Noise	50mVp-p	50mVp-p	70mVp-p	70mVp-p
Adjustable DC Voltage	±10%	±10%	±10%	±10%
Set up,rise,hold up time	200ms 100ms 30ms
Input	Voltage Range	170-264VAC 47-63HZ 240-370VDC
Input Current	0.5A/230VAC
Efficiency	78%	80%	84%	87%
AC inrush current	Cold start current 50A /230VAC
Leakage current	<0.5mA/240VAC
Protection	Overload	Related output power 105-150% start overload protection
Protection type: cutoff output, recovery after restart power
Over voltage	5.75V-6.75V	13.8V-16.2V	27.6V-32.4V	55.2V-64.8V
Hiccup mode,recovers automatically after fault condition
Environment	Working temp humidity	-10~+60°C 20%~90%RH
Stor temp, humidity	-20~+85°C 20%~90%RH Non-condensing
Safety	Withstand voltage	I/P-O/P:1.5KVAC 1min
I/P-FG:1.5KVAC 1min
O/P-FG:0.5KVAC 1min
Standard	Safety standard	Fit UL1012
Refer	Design refer to GB4943,UL60950,EN60950
EMC standard	Design refer to GB9254,EN55022 Class A
Size	size	L112W88H34mm
Package	0.3kg
Note:1.All parameters not specially mentioned are measured at 230VAC input, related load and 25 DEGREE of ambient temperature.2.Wave&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 Ultra-Thin Single Output 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.