Name: MEAN WELL LRS-1200 series: Enclosed AC/DC power supply - LRS-1200-24
Brand: MEAN WELL
SKU: LRS-1200-24
Price: 328.24 USD
Availability: InStock

MEAN WELL LRS-1200 series: Enclosed AC/DC power supply - LRS-1200-24

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Description

LRS-1200-24 — Enclosed AC/DC power supply

MEAN WELL LRS-1200-24 is a single-output enclosed AC/DC power supply delivering 24 V DC at up to 50 A, with 1200 W rated output. Its 41 mm profile, temperature-controlled fan, remote ON/OFF, remote sense and DC-OK signal suit integration into industrial equipment. Peak output is available only within the stated operating limits.

Download MEAN WELL LRS-1200 Datasheet (PDF)
Download MEAN WELL Enclosed Power Supply Installation Manual (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

LRS-1200 datasheet: PDF pages 1–8, edition 2025-09-09. Peak-load conditions: page 5; control wiring: page 6; mechanical details and accessories: pages 7–8.

Output and input specifications

Rated output	24 V DC; 50 A rated; 0–50 A current range; 1200 W rated output power.
Peak output	75 A / 1800 W for up to 5 seconds, subject to the input-voltage, duty-cycle and average-power limits below.
Peak-load operating limits	Peak operation is specified only at 200–277 V AC. Peak duration t ≤5 s and duty t/T ×100% ≤35% must both be met. Average output power Pav = [Ppk ×t + Pnpk ×(T−t)]/T must not exceed the model’s rated power. Reduce the non-peak load accordingly; peak output is not a continuous rating.
Peak-load example	The catalog’s 24 V example uses 220 V AC, 1800 W peak, 1200 W average and 10% duty. At a 5-second peak width the period is at least 50 seconds, with non-peak power no greater than 1133.3 W. This example does not replace the general ≤35% duty and average-power limits.
Output voltage adjustment	24–28 V DC via VR1. Adjustment is permitted only with 220–277 V AC input; adjusting outside this input range may cause abnormal output.
Ripple and noise	240 mVp-p maximum, measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors.
Voltage tolerance and regulation	Voltage tolerance ±1.0%, including setup tolerance, line regulation and load regulation. Line regulation ±0.5%; load regulation ±0.5%.
Setup, rise and hold-up times	At full load: setup 1500 ms and rise 70 ms at both 230 and 277 V AC. Hold-up time 10 ms typical at both 230 and 277 V AC.
Input voltage and frequency	180–305 V AC or 255–431 V DC; AC frequency 47–63 Hz. Apply low-input derating.
Input-voltage derating	The 60 Hz static-characteristic curve permits 80% load at 180 V AC, rising to 100% at 200 V AC and remaining at 100% through 305 V AC. The narrower voltage-adjustment and peak-operation input ranges still apply.
Efficiency and power factor	Efficiency 93% typical. Power factor typical: PF ≥0.95 at 230 V AC and ≥0.93 at 277 V AC, at full load.
Input current and leakage	AC current: 7 A typical at 230 V AC; 5 A typical at 277 V AC. Inrush current: 60 A typical at 230 V AC; 75 A typical at 277 V AC. Leakage current <2 mA at 240 V AC / 277 V AC.
Measurement conditions	Unless otherwise specified, parameters are measured at 230 V AC input, rated load and +25°C ambient.

Protection, control and sensing

Overload and short-circuit protection	Short-circuit protection and a built-in constant-current limiting circuit are listed. Output power above 105% of rated power for more than 5 seconds causes output shutdown. For output power above 150% of rated power, the catalog specifies constant-current limiting for more than 5 seconds followed by output shutdown. Reapply power to recover.
Overvoltage and overtemperature protection	Overvoltage threshold 29–36 V; output shuts down and requires power to be reapplied for recovery. Overtemperature protection also shuts down the output and requires power to be reapplied.
Remote ON/OFF	CN1 pin 5 is RC− and pin 6 is RC+. Output ON with the illustrated switch open or 0–0.8 V DC between RC+ and RC−. Output OFF with 3.3–10 V DC from an external auxiliary supply. The page-6 switch closes the externally powered control loop, with 6–20 mA shown; follow that circuit rather than shorting the RC pins without its external supply.
Remote sense	CN1 pin 1 = −RS; pin 2 = +RS. Connect to the corresponding load terminals using twisted-pair sense wiring. Compensation is up to 0.3 V DC of load-wire voltage drop.
DC-OK status signal	TTL-level output between CN1 pin 4 (DC_OK) and pin 3 (GND). Power ON: 3.3–5.6 V DC; power OFF: 0–1 V DC. Signal current 10 mA maximum.
Power conversion	Block diagram: EMI filter, rectifier/PFC, PWM power switching, output rectification and filtering. Switching frequency 50–130 kHz.

Cooling and environmental limits

Operating temperature and load	Operating ambient −30 to +70°C, subject to the horizontal-mounting derating curve: 100% load from −30 to +50°C; the curve marks 75% at +60°C and 50% at +70°C.
Cooling and fan noise	Forced-air cooling with built-in intelligent fan-speed control according to internal power-supply temperature. Typical fan noise at +25°C ambient: 45 dB at 10% load and 53 dB at 70% load. Keep the illustrated airflow path clear.
Humidity and storage	Operating humidity 20–90% RH, non-condensing. Storage −40 to +85°C and 10–95% RH, non-condensing.
Temperature coefficient	±0.03%/°C over 0 to +30°C.
Altitude and installation category	IEC/EN 61558-1/-2-16: OVC III, altitude up to 2000 m. IEC/EN/UL 62368-1: OVC II, altitude up to 5000 m. Above 2000 m (6500 ft), reduce the permissible ambient temperature by 5°C per additional 1000 m.
Vibration and coating	10–500 Hz, 3 G; 10 minutes per cycle and 60 minutes along each X, Y and Z axis. Conformal coating is listed.

Safety, EMC and reliability

Safety standards	Catalog listings: CB IEC 62368-1 and IEC 61558-1/-2-16; UL 62368-1; DEKRA BS EN/EN 62368-1 and BS EN/EN 61558-1/-2-16; RCM AS/NZS 62368-1 and AS/NZS 61558-1/-2-16; CQC GB 4943.1; BSMI CNS15598-1; EAC TPTC 004. RCM is on a voluntary basis with the catalog’s AS/NZS 441.1 note. KC 62368-1 and BIS IS 13252 (Part 1):2010 versions are certified by request, not stocked; confirm the required certification version when ordering.
Dielectric strength and insulation resistance	Withstand voltage: input–output 4.2 kV AC; input–FG 2.1 kV AC; output–FG 1.25 kV AC. Insulation resistance: 100 MΩ for input–output, input–FG and output–FG, tested at 500 V DC, +25°C and 70% RH.
EMC emissions	Conducted and radiated: BS EN/EN 55032 (CISPR32), CNS15936, Class A. Harmonic current: BS EN/EN 61000-3-2, Class A. Voltage flicker: BS EN/EN 61000-3-3.
EMC immunity	BS EN/EN 55035 and BS EN/EN 61000-6-2. ESD (61000-4-2): Level 3, 8 kV air / Level 2, 4 kV contact. Radiated (61000-4-3): Level 3, 10 V/m. EFT/burst (61000-4-4): Level 3, 2 kV / 5 kHz. Surge (61000-4-5): Level 4, 2 kV line–line / 4 kV line–earth. Conducted (61000-4-6): Level 3, 10 V. Magnetic field (61000-4-8): Level 4, 30 A/m. Voltage dips/interruption (61000-4-11): >95% dip for 0.5 periods, 30% dip for 25 periods, and >95% interruption for 250 periods.
Reliability and warranty	MTBF: 924.6K hours minimum, Telcordia SR-332 (Bellcore); 93.2K hours minimum, MIL-HDBK-217F at +25°C. The manufacturer lists a 3-year warranty.

Mechanical details, wiring and accessories

Dimensions and packing	225 ×124 ×41 mm (L ×W ×H), case No. 307A; mechanical-drawing tolerance ±1 mm. Catalog packing reference per unit: 1.28 kg; outer carton 9 pieces / 12 kg / 0.81 CUFT. The unit reference is not an independently measured net weight.
Mounting-hole layout	Bottom: four M4 holes, L =3 mm, with 150 ×50 mm center spacing and the first row 42 mm from the illustrated edge. Both sides: eight M4 holes in total, L =6 mm, with 171.5 mm longitudinal spacing and a 24.8 mm locating offset. Observe the permitted screw engagement and the installation drawing. In the side view, the lower side-hole centers are 13 mm above the bottom edge and the vertical center spacing is 18 mm.
Side-detail and front markings	The page-7 side-detail drawing labels local 1.0, 4.2, 6.9 and 13.3 mm dimensions; consult that detail for the exact feature locations. The front drawing identifies VR1 for output-voltage adjustment and LED1 as the indicator location.
Terminal spacing and bracket layout	TB2/TB3 output-terminal pitch 19 mm; TB1 input-terminal pitch 9.5 mm. The optional bracket layout shows 171.5 mm longitudinal mounting pitch and 144 mm transverse mounting-center spacing; these are mounting dimensions, not the 225 ×124 mm enclosure size.
AC input terminals	TB1: pin 1 AC/L, pin 2 AC/N, pin 3 FG. DEGSON DG46S-B-03P-13 terminal; M3.5 screws; mounting torque 8–10 kgf·cm.
DC output terminals	TB2 = −Vo; TB3 = +Vo. MEAN WELL HS455 terminals; M5 screws; mounting torque 10–12 kgf·cm.
Control connector and mating parts	CN1: DJS-9001R1-06 or equivalent. Pins 1 −RS, 2 +RS, 3 GND, 4 DC_OK, 5 RC−, 6 RC+. Mating housing JS-1101-06 and terminals JS-1101-TXX, or equivalents.
Standard and optional accessories	One CN1 mating wire harness is supplied as a standard accessory per power supply: UL1007, 28 AWG, 50 ±5 mm. Optional PGG2MHS012 mounting brackets are ordered separately; the catalog installation uses 4 pieces per power supply. Optional PEE4TBC-03 terminal cover is ordered separately, 1 piece per power supply.
Applications	Industrial automation machinery, industrial control systems, mechanical and electrical equipment, and electronic instruments or apparatus. The low-profile series lists a power density of 17 W/in³.

Installation and system integration

Safe installation and servicing	Install this component power supply inside the end-system enclosure. Disconnect the system from the mains before installation or maintenance and prevent accidental reconnection. Keep it away from high moisture, water and fire sources. Have faults examined by a qualified technician; do not remove the power-supply case yourself.
Ventilation and mounting	Keep both fans and all ventilation openings unobstructed. Maintain 10–15 cm clearance when an adjacent device is a heat source. Non-standard mounting orientation or high ambient temperature may require further output derating. Follow the model drawing for mounting-screw penetration and maintain insulation clearance from internal components.
Power terminals and protective earth	Connect TB1 pin 1 AC/L to live, pin 2 AC/N to neutral, and pin 3 FG to protective earth. TB2 is −Vo and TB3 is +Vo. Use the LRS-1200 terminal values: M3.5 input screws at 8–10 kgf·cm and M5 output screws at 10–12 kgf·cm. Secure every conductor strand and connection; generic enclosure-material torque tables do not replace these terminal values.
Conductor selection	Select conductors for the actual continuous and permitted peak currents, temperature, installation and terminal capability. The manual wire guide lists 18/16/14/12/10/8 AWG with 0.75/1.00/1.5/2.5/4/6 mm² and respective current bands of 6/6–10/10–16/16–25/25–32/32–40 A. With five or more wires connected to the unit, derate each wire to 80% of the guide current. This table ends at 40 A; obtain suitable high-current wiring guidance where the application exceeds it rather than extrapolating the table.
Continuous and peak loading	Keep continuous output within the model rating and applicable input, ambient-temperature and altitude derating limits. The separate peak rating is available only under all of the current datasheet conditions: 200–277 VAC input, a pulse no longer than 5 seconds, duty cycle no greater than 35%, and cycle-average output power no greater than the model-rated power.
BSMI Class A installation	For the BSMI-certified Class A configuration, surrounding equipment must have flammability classification V1 or above. Do not install or use this Class A equipment in a residential environment, to avoid electromagnetic interference.
Complete-system EMC verification	Verify EMC again with the power supply installed in the final equipment and connected to its representative load. Wiring, assembly and the application affect the result. The LRS-1200 datasheet records a 720 × 360 × 1 mm metal plate for its component EMC test; this is a test arrangement, not a supplied accessory or an installation-clearance requirement. The linked EMI guidance supports system testing and does not certify the finished equipment.