MS-250W mini type mini size MS series electric 250W 5V 12V

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 MS-250W mini type mini size MS series electric 250W 5V 12V

The MS-250W mini type mini size MS series electric 250W 5V 12V is part of the ELEHPD MS Series range. Mini size switching power supply 250w MS-250W Features: • Universal AC input / Full range • Protections:Short circuit/Over load/Over voltage • Cooling by free air convection • 100% full load burn-in test • Fixed switching frequency at 77KHz • 2 years warranty SPECIFICATION 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: mini type mini size MS series electric industry switching power supply MS-250W

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

Mini size switching power supply 250w MS-250W

Features :

• Universal AC input / Full range

• Protections:Short circuit/Over load/Over voltage

• Cooling by free air convection

• 100% full load burn-in test

• Fixed switching frequency at 77KHz

• 2 years warranty

SPECIFICATION

MODEL	MS-250-5	MS-250-12	MS-250-15	MS-250-24	MS-250-27	MS-250-48
OUTPUT	DC voltage	5V	12V	15V	24V	27V	48V
Voltage tolerance	±1%	±1%	±1%	±1%	±1%	±1%
Rated current	40A	20A	16A	10A	9A	5.2A
Current range	0~40A	0~20A	0~16A	0~10A	0~9A	0~5.2A
Rated power	200W	240W	240W	240W	243W	249.6W
Ripple&noise	150mvp-p	150mvp-p	180mvp-p	180mvp-p	180mvp-p	200mvp-p
DC voltage ADJ.range	-9%~+10%	±10%	±10%	±10%	±10%	±10%
INPUT	Voltage range	90~132VAC/180~264VAC(selected by switch),254~373VDC
frequency	47~63Hz
AC current	4.5A/115VAC,2.5A/230VAC
efficiency	82%	84%	84%	85%	85%	86%
Inrush current	Cold start current 25A/115VAC,40A/230VAC
Leakage current	< 2.5mA/240VAC
PROTECTION	overload	Rated output power110%~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	42.6~44.2V	54.8~56.6V
protection type:hiccup mode,auto-recovery after fault condition is removed
Over temperature	TSW1detect on heatsink of power transistor≥95ºC±5ºC, start over temperature protection
protection type:hiccup mode,auto-recovery after temperature become normal
ENVIROMENT	Working temp,humidity	-10ºC~+60ºC,20%~90%RH
Storagetemp,humidity	-20ºC~+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:1.5KVAC 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	1999948mm (LWH)
Weight/packing	0.7kg/24pcs/17.5kg/0.034 m³/1.2CUFT
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 MS-250W mini type mini size MS series electric 250W 5V 12V

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.