MEAN WELL Enclosed Power Supply SE-450 Series Single Output Switching Power Supply

Product Item : SE-450 series
Category：Enclosed Type
Wattage: 450W
Input Voltage: 90 ~ 132VAC/180 ~ 264VAC by switch 254 ~ 370VDC
Output Current: 0 ~ 75A
Output Voltage: 3.3 ~ 48V
Product description：The Mean Well SE-450 is a 450W single-output AC/DC power supply with active PFC, designed for reliable industrial and general-purpose use.
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SE-450 Series - 450W Single-Output Enclosed Switching Power Supply

✓ In Stock 2-Year Warranty 7 Voltage Options UL Listed Remote Sense

				Key Performance at a Glance
			
						450W
					
						Rated Power
					
						75A
					
						Max Output Current
					
						88%
					
						Max Efficiency
					
						50mm
					
						Profile Height
					
						-10~60C
					
						Operating Temp Range
					
						7
					
						Output Models

Product Overview

The SE-450 series is MEAN WELL's classic 450W single-output enclosed switching power supply, offering 7 output voltage options from 3.3V to 48V - the widest voltage coverage in any standard enclosed supply. Unlike the LRS N2 series, the SE-450 includes unique low-voltage models (3.3V, 5V) for legacy and specialized industrial equipment.

The SE-450 uses a switchable 90~132VAC / 180~264VAC input (selected via built-in switch) and supports 254~370VDC input. Built around a 100KHz switching design with built-in DC fan cooling, active inrush current limiting, and remote sense capability, it delivers reliable power across a -10C to +60C temperature range. This is a budget-friendly, UL-certified workhorse for standard industrial applications.

Measuring 225x124x50mm, the SE-450 is slightly taller than the LRS N2 family but shares the same footprint. The remote sense function (via CN102 connector) compensates for voltage drop over long cable runs - a feature not available on the LRS N2 series. For 3.3V and 5V high-current applications (up to 75A), the SE-450 is often the only enclosed solution available without going to open-frame designs.

The SE-450 is UL62368-1 listed with EAC TP TC 004 certification, and design reference to BS EN/EN62368-1. It includes short-circuit, overload (105%~150%), overvoltage, and over-temperature protection. Note: This model is not compliant with EN61000-3-2 harmonic current limits for certain EU applications. The overload and OVP protections require a power cycle to recover.

Product Images

Technical Specifications

Parameter	SE-450-3.3	SE-450-5	SE-450-12	SE-450-15	SE-450-24	SE-450-36	SE-450-48
DC Output Voltage	3.3V	5V	12V	15V	24V	36V	48V
Rated Current	75A	75A	37.5A	30A	18.8A	12.5A	9.4A
Rated Power	247.5W	375W	450W	450W	451.2W	450W	451.2W
Ripple & Noise (max)	200mVp-p	200mVp-p	200mVp-p	200mVp-p	200mVp-p	200mVp-p	200mVp-p
Voltage Adjustment Range	2.97~3.63V	4.5~5.5V	10.8~13.5V	13.5~16.5V	21.6~28.5V	32.4~39.6V	43.2~52.8V
Voltage Accuracy	+/-3.0%	+/-3.0%	+/-1.0%	+/-1.0%	+/-1.5%	+/-1.0%	+/-1.0%
Line Regulation	+/-0.5%	+/-0.5%	+/-0.3%	+/-0.3%	+/-0.2%	+/-0.2%	+/-0.2%
Load Regulation	+/-2.0%	+/-2.0%	+/-0.5%	+/-0.5%	+/-0.5%	+/-0.5%	+/-0.5%
Efficiency (Typ.)	74%	78%	83%	84%	86%	86%	88%

Input Specifications (All Models)

Input Voltage Range	90~132VAC / 180~264VAC (switch-selectable); 254~370VDC
Inrush Current Limiting	Active inrush current limiting circuit built-in
Frequency Range	47~63Hz
AC Current (Typ.)	10A / 115VAC \| 6A / 230VAC
Inrush Current (Typ.)	35A / 115VAC \| 55A / 230VAC (cold start)
Leakage Current	< 2.5mA / 240VAC

Protection Features & Environmental Ratings

Overload Protection	105%~150% rated power -> output shutdown; power cycle to recover
Overvoltage Protection	3.3V: 3.8~4.6V / 5V: 5.75~6.75V / 12V: 13.8~16.2V / 15V: 18~21V / 24V: 32~36V / 36V: 45~52V / 48V: 57.6~67.2V (shutdown output; power cycle to recover)
Over-temperature Protection	Shutdown output, auto-recovery after temperature drops to safe level
Short Circuit Protection	Output shutdown, power cycle to recover
Remote Sense	Via CN102 connector (compensates up to 0.5V line drop per wire)
Operating Temperature	-10~+60C (refer to derating curve)
Operating Humidity	20~90% RH, non-condensing
Storage Temp / Humidity	-40~+85C, 10~95% RH
Temperature Coefficient	+/-0.05%/C (0 ~ 50C)
Vibration Resistance	10~500Hz, 2G, 10 min/cycle, 60 min each for X, Y, Z axes
MTBF	>= 1,557.5K hrs (Telcordia SR-332); >= 224.1K hrs (MIL-HDBK-217F, 25C)
Dimensions	225 x 124 x 50 mm (LxWxH)
Net Weight / Packaging	1.25 kg / 12 pcs per carton / 16 kg / 1.0 CUFT

Safety Standards & Certifications

Safety Standards	UL62368-1, EAC TP TC 004 certified Design refers to: BS EN/EN62368-1
Withstand Voltage	I/P-O/P: 3KVAC \| I/P-FG: 2KVAC \| O/P-FG: 0.5KVAC
Insulation Resistance	I/P-O/P, I/P-FG, O/P-FG: > 100Mohm / 500VDC / 25C / 70% RH
EMC Note	Not compliant with BS EN/EN61000-3-2 harmonic current limits. See FAQ for EU usage restrictions.

Key Features

7 Output Voltage Options
3.3V, 5V, 12V, 15V, 24V, 36V, 48V - widest voltage coverage for legacy and modern equipment

75A High-Current Capability
Delivers 75A at 3.3V/5V - ideal for high-current low-voltage industrial and test equipment

Remote Sense Function
CN102 connector compensates for voltage drop over long cable runs - maintains precise regulation at the load

Active Inrush Current Limiting
Built-in circuit reduces startup surge stress on upstream breakers and AC distribution

Built-in DC Fan Cooling
Forced-air cooling enables 450W output in a compact 225x124x50mm chassis

UL62368-1 Listed
UL certified for North American deployment; EAC TP TC 004 for Eurasian markets

Switchable AC Input
90~132VAC / 180~264VAC via built-in selector switch; also accepts 254~370VDC

Comprehensive Protection
Short-circuit, overload (105~150%), overvoltage, and over-temperature protection

450W Versatile Power
Full 450W from 12V and above; cost-effective solution for industrial automation and electronics

2-Year Warranty
Backed by MEAN WELL's quality assurance with 2-year global warranty coverage

Frequently Asked Questions

How does the SE-450 differ from the LRS-350N2 or LRS-600N2?

The SE-450 is a different product family focused on versatility and value. Key differences: (1) 7 voltage options including 3.3V and 5V not available in LRS N2; (2) remote sense capability for voltage-drop compensation; (3) active inrush current limiting; (4) no peak power capability - it is a standard-output supply; (5) narrower temperature range (-10~60C vs -20~70C); (6) 2G vibration (vs 5G); (7) 2-year warranty (vs 3-year); (8) lower efficiency (74-88% vs 85-92%). Choose the SE-450 when you need 3.3V/5V outputs, remote sense, or a budget-friendly UL-listed 450W supply.

What is the remote sense function and when should I use it?

The remote sense (CN102 connector) allows the power supply to monitor the voltage at the load rather than at its output terminals. This compensates for voltage drop in the connecting cables - up to 0.5V per wire. It is essential for 3.3V and 5V applications where even small voltage drops can cause equipment malfunction. To use it: connect +S to the positive load terminal and -S to the negative load terminal via the CN102 connector.

Can the SE-450 be used in EU countries?

The SE-450 is not compliant with BS EN/EN61000-3-2 harmonic current limits. It should NOT be used in end equipment meeting ALL of these conditions: (a) used within the EU, (b) connected to 220VAC+ public mains, (c) installed in equipment with average input power >75W, and (d) part of a lighting system. Professional equipment rated >1,000W and symmetrically controlled heating elements <=200W are exempt.

Why are 3.3V and 5V models rated at lower wattage?

The 3.3V model is rated at 247.5W (75A x 3.3V) and the 5V model at 375W (75A x 5V) because the output wattage is limited by the secondary-side rectifier design, not by current capacity. All models from 12V and above deliver the full 450W. The lower-voltage models are optimized for current delivery at the expense of total wattage.

How do I recover after protection trips?

Unlike LRS N2 models which auto-recover from most faults, the SE-450 requires a power cycle (turn off AC, wait, turn on) to recover from overload, overvoltage, and short-circuit protection events. Only over-temperature protection auto-recovers. Plan your system design accordingly if this behavior affects your application.

Related Products

Select the SE-450 model that matches your voltage requirement. All seven models feature remote sense (CN102), active inrush current limiting, built-in fan cooling, and UL62368-1 listing.