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Low-Profile Enclosed Switching Power Supply – LRS Series
DAPPRA Enclosed Industrial Power Supply
LRS Series — Low-Profile
Enclosed Switching Power Supply
The DAPPRA LRS Series is a low-profile single-output enclosed switching power supply series designed for industrial automation, control systems and electromechanical equipment.
Covering 35W to 1200W with 3.3V to 48V output, the LRS Series features a 30mm 1U low-profile design, efficiency up to 94%, and up to 200% short-duration peak power capability on the N2 series. Metal mesh case enhances heat dissipation for reliable fanless or fan-cooled operation.
35–1200 W
Output Power
3.3–48 VDC
Output Voltage
up to 94%
Efficiency
200%
Peak Load (N2 Series)
Overview
LRS Series Overview
The DAPPRA LRS Series is a low-profile single-output enclosed switching power supply series with 30mm of low-profile design (1U). It covers a wide power range from 35W to 1200W with output voltages of 3.3V, 4.2V, 5V, 12V, 15V, 24V, 27V, 36V and 48V, and is compliant with international safety regulations such as IEC/UL 62368-1, BS EN/EN61558-1/-2-16 and BS EN/EN60335-1.
The series uses a metallic mesh case to enhance heat dissipation. Small and medium power models (35W to 200W) operate with free air convection without a fan, while higher power models (350W and above) use forced air cooling with built-in DC fan and Fan ON/OFF control. The N2 series (LRS-100N2, LRS-200N2, LRS-350N2, LRS-600N2) provides up to 200% short-duration peak power for motor applications and electromechanical loads requiring much higher power during startup.
Key Features
LRS Series Key Features
Engineered for low-profile, high-efficiency industrial power supply applications.
- 1U Low-Profile Design (30mm)The entire series uses a 30mm (1U) low-profile metal mesh case that saves installation space in electrical cabinets and equipment. The metallic mesh construction enhances heat dissipation for reliable operation.
- Universal AC Input (Small/Medium Power)The LRS-35, LRS-50, LRS-75, LRS-100 and LRS-150F use full-range 85–264 VAC universal input. The LRS-150, LRS-200, LRS-350, LRS-450 and LRS-600 use selectable AC input 90–132 VAC / 180–264 VAC via switch. The LRS-1200 supports 180–305 VAC input.
- High Efficiency up to 94%Efficiency ranges from 79.5% (LRS-350-3.3) up to 94% (LRS-1200 models), reducing energy consumption and heat generation in control cabinets.
- 200% Peak Power Capability (N2 Series)The LRS-100N2, LRS-200N2, LRS-350N2 and LRS-600N2 provide up to 200% short-duration peak power for motor applications and electromechanical loads requiring much higher power during startup.
- Fanless / Fan-Cooled OptionsLRS-35 through LRS-200 use free air convection cooling without a fan. LRS-350, LRS-450, LRS-600 and LRS-1200 use forced air cooling with built-in DC fan and Fan ON/OFF control (fan turns ON at RTH3 ≥50°C, OFF at ≤40°C).
- Complete Protection FunctionsShort circuit protection, overload protection (hiccup mode or constant current limiting, auto-recovery), over voltage protection and over temperature protection are built in.
- Wide Operating Temperature RangeMost models operate from -30°C or -25°C to +70°C with derating above +50°C. The LRS-1200 supports -30°C to +70°C. 5G vibration resistance for rugged industrial environments.
- High Operating AltitudeSome models support up to 5000 meters operating altitude (LRS-35/50/75/100/350/450/600). The LRS-1200 supports up to 5000 meters with conformal coating.
- 3 Years WarrantyStandard 3 years warranty for all LRS Series models.
Model Selection
LRS Series Model Selection
Select the appropriate LRS model according to the required output power, output voltage and peak power requirement.
The LRS Series is available from 35W to 1200W. The standard series provides continuous power ratings, while the N2 series (100N2 / 200N2 / 350N2 / 600N2) adds up to 200% short-duration peak power capability for motor and electromechanical loads.
Model Code
LRS
–
200
N2
–
24
LRSSeries prefix — DAPPRA LRS Series Low-Profile Enclosed Switching Power Supply.
200 — Output WattageOutput power rating in Watts: 35 / 50 / 75 / 100 / 150 / 200 / 350 / 450 / 600 / 1200.
N2 — Peak Power Suffix (Optional)Indicates 2 times peak power capability. N2 series provides up to 200% short-duration peak power. LRS-150F indicates full-range input on LRS-150 series.
24 — Output VoltageNominal output voltage in VDC: 3.3 / 4.2 / 5 / 12 / 15 / 24 / 27 / 36 / 48 (varies by power rating).
Field
Meaning
Available Values
LRS
Series prefix
LRS
Output Wattage
Rated output power in Watts
35 / 50 / 75 / 100 / 150 / 200 / 350 / 450 / 600 / 1200
Peak Suffix
2x peak power / full range input
Blank / N2 / F
Output Voltage
Nominal DC output voltage
3.3 / 4.2 / 5 / 12 / 15 / 24 / 27 / 36 / 48 VDC
Example: LRS-200N2-24 = LRS Series, 200W output power, N2 peak-power version, 24V DC output.
LRS-35 — 35W Single Output
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Input | Cooling |
|---|---|---|---|---|---|---|
| LRS-35-5 | 5 VDC | 7 A | 35 W | 82% | 85–264 VAC | Fanless |
| LRS-35-12 | 12 VDC | 3 A | 36 W | 86% | 85–264 VAC | Fanless |
| LRS-35-15 | 15 VDC | 2.4 A | 36 W | 86% | 85–264 VAC | Fanless |
| LRS-35-24 | 24 VDC | 1.5 A | 36 W | 88% | 85–264 VAC | Fanless |
| LRS-35-36 | 36 VDC | 1 A | 36 W | 88% | 85–264 VAC | Fanless |
| LRS-35-48 | 48 VDC | 0.8 A | 38.4 W | 89% | 85–264 VAC | Fanless |
LRS-50 — 50W Single Output
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Input | Cooling |
|---|---|---|---|---|---|---|
| LRS-50-3.3 | 3.3 VDC | 10 A | 33 W | ~81% | 85–264 VAC | Fanless |
| LRS-50-5 | 5 VDC | 10 A | 50 W | ~83% | 85–264 VAC | Fanless |
| LRS-50-12 | 12 VDC | 4.2 A | 50.4 W | ~86% | 85–264 VAC | Fanless |
| LRS-50-15 | 15 VDC | 3.4 A | 51 W | ~86% | 85–264 VAC | Fanless |
| LRS-50-24 | 24 VDC | 2.2 A | 52.8 W | ~88% | 85–264 VAC | Fanless |
| LRS-50-36 | 36 VDC | 1.45 A | 52.2 W | ~89% | 85–264 VAC | Fanless |
| LRS-50-48 | 48 VDC | 1.1 A | 52.8 W | ~90% | 85–264 VAC | Fanless |
LRS-75 — 75W Single Output
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Input | Cooling |
|---|---|---|---|---|---|---|
| LRS-75-5 | 5 VDC | 14 A | 70 W | 86.5% | 85–264 VAC | Fanless |
| LRS-75-12 | 12 VDC | 6 A | 72 W | 89% | 85–264 VAC | Fanless |
| LRS-75-15 | 15 VDC | 5 A | 75 W | 89% | 85–264 VAC | Fanless |
| LRS-75-24 | 24 VDC | 3.2 A | 76.8 W | 90% | 85–264 VAC | Fanless |
| LRS-75-36 | 36 VDC | 2.1 A | 75.6 W | 91.5% | 85–264 VAC | Fanless |
| LRS-75-48 | 48 VDC | 1.6 A | 76.8 W | 91.5% | 85–264 VAC | Fanless |
LRS-100 — 100W Single Output
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Input | Cooling |
|---|---|---|---|---|---|---|
| LRS-100-3.3 | 3.3 VDC | 20 A | 66 W | 84.5% | 85–264 VAC | Fanless |
| LRS-100-5 | 5 VDC | 18 A | 90 W | 86% | 85–264 VAC | Fanless |
| LRS-100-12 | 12 VDC | 8.5 A | 102 W | 88% | 85–264 VAC | Fanless |
| LRS-100-15 | 15 VDC | 7 A | 105 W | 88.5% | 85–264 VAC | Fanless |
| LRS-100-24 | 24 VDC | 4.5 A | 108 W | 90% | 85–264 VAC | Fanless |
| LRS-100-36 | 36 VDC | 2.8 A | 100.8 W | 90.5% | 85–264 VAC | Fanless |
| LRS-100-48 | 48 VDC | 2.3 A | 110.4 W | 91% | 85–264 VAC | Fanless |
LRS-100N2 — 100W with 200% Peak Power
| Model | Output Voltage | Output Current | Rated Power | Peak Power (200%) | Efficiency | Cooling |
|---|---|---|---|---|---|---|
| LRS-100N2-12 | 12 VDC | 8.5 A | 102 W | 200 W | 88% | Fanless |
| LRS-100N2-24 | 24 VDC | 4.2 A | 100.8 W | 200 W | 90% | Fanless |
| LRS-100N2-36 | 36 VDC | 2.8 A | 100.8 W | 200 W | 90% | Fanless |
| LRS-100N2-48 | 48 VDC | 2.1 A | 100.8 W | 200 W | 90.5% | Fanless |
LRS-150 / LRS-150F — 150W Single Output
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Input | Cooling |
|---|---|---|---|---|---|---|
| LRS-150-12 | 12 VDC | 12.5 A | 150 W | 87.5% | 85–132 / 170–264 VAC | Fanless |
| LRS-150-15 | 15 VDC | 10 A | 150 W | 88.5% | 85–132 / 170–264 VAC | Fanless |
| LRS-150-24 | 24 VDC | 6.5 A | 156 W | 89% | 85–132 / 170–264 VAC | Fanless |
| LRS-150-36 | 36 VDC | 4.3 A | 154.8 W | 89% | 85–132 / 170–264 VAC | Fanless |
| LRS-150-48 | 48 VDC | 3.3 A | 158.4 W | 90% | 85–132 / 170–264 VAC | Fanless |
| LRS-150F-5 | 5 VDC | 22 A | 110 W | 85% | 85–264 VAC (Full range) | Fanless |
| LRS-150F-12 | 12 VDC | 12.5 A | 150 W | 87.5% | 85–264 VAC (Full range) | Fanless |
| LRS-150F-15 | 15 VDC | 10 A | 150 W | 89% | 85–264 VAC (Full range) | Fanless |
| LRS-150F-24 | 24 VDC | 6.5 A | 156 W | 89% | 85–264 VAC (Full range) | Fanless |
| LRS-150F-36 | 36 VDC | 4.3 A | 154.8 W | 89% | 85–264 VAC (Full range) | Fanless |
| LRS-150F-48 | 48 VDC | 3.3 A | 158.4 W | 90% | 85–264 VAC (Full range) | Fanless |
LRS-150 uses selectable AC input by switch; LRS-150F uses full-range universal AC input. LRS-150F-5 is the 5V version with lower rated power.
LRS-200 — 200W Single Output
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Cooling |
|---|---|---|---|---|---|
| LRS-200-3.3 | 3.3 VDC | 40 A | 132 W | 83% | Fanless |
| LRS-200-4.2 | 4.2 VDC | 40 A | 168 W | 86% | Fanless |
| LRS-200-5 | 5 VDC | 40 A | 200 W | 87% | Fanless |
| LRS-200-12 | 12 VDC | 17 A | 204 W | 87.5% | Fanless |
| LRS-200-15 | 15 VDC | 14 A | 210 W | 88% | Fanless |
| LRS-200-24 | 24 VDC | 8.8 A | 211.2 W | 89.5% | Fanless |
| LRS-200-36 | 36 VDC | 5.9 A | 212.4 W | 89.5% | Fanless |
| LRS-200-48 | 48 VDC | 4.4 A | 211.2 W | 90% | Fanless |
LRS-200N2 — 200W with 200% Peak Power
| Model | Output Voltage | Output Current | Rated Power | Peak Power (200%) | Efficiency | Cooling |
|---|---|---|---|---|---|---|
| LRS-200N2-12 | 12 VDC | 17 A | 204 W | 408 W | 87.5% | Fanless |
| LRS-200N2-24 | 24 VDC | 8.8 A | 211.2 W | 422 W | 89.5% | Fanless |
| LRS-200N2-36 | 36 VDC | 5.9 A | 212.4 W | 425 W | 89.5% | Fanless |
| LRS-200N2-48 | 48 VDC | 4.4 A | 211.2 W | 422 W | 90% | Fanless |
LRS-350 — 350W Single Output with Fan
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Cooling |
|---|---|---|---|---|---|
| LRS-350-3.3 | 3.3 VDC | 60 A | 198 W | 79.5% | Fan |
| LRS-350-4.2 | 4.2 VDC | 60 A | 252 W | 81.5% | Fan |
| LRS-350-5 | 5 VDC | 60 A | 300 W | 83.5% | Fan |
| LRS-350-12 | 12 VDC | 29 A | 348 W | 85% | Fan |
| LRS-350-15 | 15 VDC | 23.2 A | 348 W | 86% | Fan |
| LRS-350-24 | 24 VDC | 14.6 A | 350.4 W | 88% | Fan |
| LRS-350-36 | 36 VDC | 9.7 A | 349.2 W | 88.5% | Fan |
| LRS-350-48 | 48 VDC | 7.3 A | 350.4 W | 89% | Fan |
LRS-350N2 — 350W with 200% Peak Power
| Model | Output Voltage | Output Current | Rated Power | Peak Power (200%) | Efficiency | Cooling |
|---|---|---|---|---|---|---|
| LRS-350N2-12 | 12 VDC | 29 A | 348 W | 696 W | 85% | Fan |
| LRS-350N2-24 | 24 VDC | 14.6 A | 350.4 W | 700 W | 88% | Fan |
| LRS-350N2-36 | 36 VDC | 9.7 A | 349.2 W | 698 W | 88.5% | Fan |
| LRS-350N2-48 | 48 VDC | 7.3 A | 350.4 W | 700 W | 89% | Fan |
LRS-450 — 450W Single Output with Fan
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Cooling |
|---|---|---|---|---|---|
| LRS-450-5 | 5 VDC | 75 A | 375 W | 87% | Fan |
| LRS-450-12 | 12 VDC | 37.5 A | 450 W | 90% | Fan |
| LRS-450-15 | 15 VDC | 30 A | 450 W | 90% | Fan |
| LRS-450-24 | 24 VDC | 18.8 A | 451.2 W | 91% | Fan |
| LRS-450-36 | 36 VDC | 12.5 A | 450 W | 92% | Fan |
| LRS-450-48 | 48 VDC | 9.4 A | 451.2 W | 92% | Fan |
LRS-600 — 600W Single Output with Fan
| Model | Output Voltage | Output Current | Rated Power | Efficiency | Cooling |
|---|---|---|---|---|---|
| LRS-600-5 | 5 VDC | 100 A | 500 W | 86% | Fan |
| LRS-600-12 | 12 VDC | 50 A | 600 W | 90% | Fan |
| LRS-600-15 | 15 VDC | 40 A | 600 W | 90% | Fan |
| LRS-600-24 | 24 VDC | 25 A | 600 W | 91% | Fan |
| LRS-600-27 | 27 VDC | 22.2 A | 599.4 W | 91% | Fan |
| LRS-600-36 | 36 VDC | 16.6 A | 597.6 W | 92% | Fan |
| LRS-600-48 | 48 VDC | 12.5 A | 600 W | 92% | Fan |
LRS-600N2 — 600W with 200% Peak Power
| Model | Output Voltage | Output Current | Rated Power | Peak Power (200%) | Efficiency | Cooling |
|---|---|---|---|---|---|---|
| LRS-600N2-12 | 12 VDC | 50 A | 600 W | 1200 W | 90% | Fan |
| LRS-600N2-24 | 24 VDC | 25 A | 600 W | 1200 W | 91% | Fan |
| LRS-600N2-36 | 36 VDC | 16.6 A | 597.6 W | 1195 W | 92% | Fan |
| LRS-600N2-48 | 48 VDC | 12.5 A | 600 W | 1200 W | 92% | Fan |
LRS-1200 — 1200W Single Output with Fan
| Model | Output Voltage | Output Current | Rated Power | Peak Power (150%) | Efficiency | Input |
|---|---|---|---|---|---|---|
| LRS-1200-12 | 12 VDC | 92 A | 1104 W | 1656 W | 91% | 180–305 VAC |
| LRS-1200-24 | 24 VDC | 50 A | 1200 W | 1800 W | 93% | 180–305 VAC |
| LRS-1200-36 | 36 VDC | 33.3 A | 1198.8 W | 1800 W | 94% | 180–305 VAC |
| LRS-1200-48 | 48 VDC | 25 A | 1200 W | 1800 W | 94% | 180–305 VAC |
LRS-1200 supports 150% peak power @5s (1800W peak), built-in DC OK / Remote Control / Remote Sense, conformal coating, up to 5000 m operating altitude, -30 to +70°C wide range operation.
Dimensions
LRS Series Dimensions
Low-profile 1U enclosed metal mesh case with perforated ventilation design. All dimensions in mm, tolerance ±1 mm.
LRS-35 / LRS-50
| Length (L) | 99 mm |
| Width (W) | 82 mm |
| Height (H) | 30 mm (1U) |
| Housing | Metal mesh case |
| Cooling | Free air convection |
LRS-75
| Length (L) | 99 mm |
| Width (W) | 97 mm |
| Height (H) | 30 mm (1U) |
| Housing | Metal mesh case |
| Cooling | Free air convection |
LRS-100 / LRS-100N2
| Length (L) | 129 mm |
| Width (W) | 97 mm |
| Height (H) | 30 mm (1U) |
| Housing | Metal mesh case |
| Cooling | Free air convection |
LRS-150 / LRS-150F
| Length (L) | 159 mm |
| Width (W) | 97 mm |
| Height (H) | 30 mm (1U) |
| Housing | Metal mesh case |
| Cooling | Free air convection |
LRS-200 / LRS-200N2
| Length (L) | 215 mm |
| Width (W) | 115 mm |
| Height (H) | 30 mm (1U) |
| Housing | Metal mesh case |
| Cooling | Free air convection |
LRS-350 / 350N2 / 450 / 600 / 600N2
| Length (L) | 215 / 225 mm |
| Width (W) | 115 / 124 mm |
| Height (H) | 30 / 35 / 41 mm (1U) |
| Housing | Metal mesh case |
| Cooling | Forced air (built-in fan) |
LRS-1200
| Length (L) | 225 mm |
| Width (W) | 124 mm |
| Height (H) | 41 mm (1U) |
| Housing | Metal mesh case, conformal coating |
| Cooling | Forced air (built-in intelligent fan) |
Mounting
| Mounting Holes | Bottom mounting (chassis) |
| Cooling (35–200W) | Free air convection (fanless) |
| Cooling (350W+) | Forced air, Fan ON/OFF control |
| Operating Temp. | -30 / -25 / -20°C to +70°C (model dependent) |
Installation
LRS Series Installation
The LRS Series uses an enclosed chassis design for standalone mounting inside industrial equipment. Adequate ventilation clearance is required.
01 / 06
Chassis Mounting
Mount the unit on a flat metal surface using the mounting holes on the chassis base. Ensure the unit is securely fixed to prevent vibration and movement. Recommended mounting screws: M4.
02 / 06
Ventilation Clearance
Always allow good ventilation clearances around the unit: at least 5 mm on left and right, 40 mm above and 20 mm below, to prevent overheating.
03 / 06
Airflow Direction
For fan-cooled models (350W and above), ensure the airflow direction is not blocked. The built-in fan pulls air through the chassis from the vented sides.
04 / 06
FG Must Be Connected to PE
The FG (Frame Ground) terminal must be connected to PE (Protective Earth) for safety and to ensure proper EMC performance.
05 / 06
Operating Temperature Limits
Small/medium models (35W–100W) operate from -30°C to +70°C. LRS-150/200/350/450/600 operate from -25 or -20°C to +70°C. LRS-1200 operates from -30°C to +70°C. Derating required above +50°C for most models.
06 / 06
Indoor Use Only
Install the unit only in a dry, well-ventilated location. Do not install in places with high moisture or near water. Operating altitude up to 5000 m (some models, with derating above 2000 m).
The LRS Series requires adequate ventilation clearance. Ensure the perforated ventilation openings and the fan intake/exhaust are not blocked. Do not install in orientations other than the recommended position.
Wiring & Terminal
LRS Series Wiring & Terminal
The LRS Series uses screw-type terminal blocks for input and output connections. Use copper wire only and ensure all strands enter the terminal connection securely.
Terminal Pin Assignment
LRS-35 / 50 / 75 — 5 Pins
| Pin No. | Assignment |
|---|---|
| 1 | AC/L |
| 2 | AC/N |
| 3 | FG (Frame Ground) |
| 4 | DC OUTPUT -V |
| 5 | DC OUTPUT +V |
LRS-100 / 100N2 — 7 Pins
| Pin No. | Assignment |
|---|---|
| 1 | AC/L |
| 2 | AC/N |
| 3 | FG (Frame Ground) |
| 4, 5 | DC OUTPUT -V |
| 6, 7 | DC OUTPUT +V |
LRS-150 / 150F / 200 / 200N2 / 350 / 350N2 / 450 / 600 / 600N2 — 9 Pins
| Pin No. | Assignment |
|---|---|
| 1 | AC/L |
| 2 | AC/N |
| 3 | FG (Frame Ground) |
| 4, 5, 6 | DC OUTPUT -V |
| 7, 8, 9 | DC OUTPUT +V |
LRS-1200 — Terminal + Control Pin
| Terminal / Pin | Assignment |
|---|---|
| TB1 | 1=AC/L, 2=AC/N, 3=FG |
| TB2/TB3 | +Vo / -Vo (DC output, screw M5) |
| CN1 (1) | -RS (Remote Sense negative) |
| CN1 (2) | +RS (Remote Sense positive) |
| CN1 (3) | GND |
| CN1 (4) | DC OK |
| CN1 (5) | RC- (Remote Control negative) |
| CN1 (6) | RC+ (Remote Control positive) |
LRS-1200 features 6-pin CN1 connector for Remote Sense, DC OK, and Remote Control. Mating housing: JST S6B-PH-K-S or equivalent.
The FG pin must be connected to PE (Protective Earth). The number of output terminals varies by model — always verify the terminal label before wiring. Multiple DC output pins (e.g., 4,5,6 and 7,8,9) should all be connected to their respective output wires to prevent excessive current stress on a single contact.
Wiring Specification
Recommended Wire
| AWG | Rated Current | Cross-section |
|---|---|---|
| 18 | 0–6 A | 0.75 mm² |
| 16 | 6–10 A | 1.00 mm² |
| 14 | 13–16 A | 1.52 mm² |
| 12 | 16–25 A | 2.5 mm² |
Use stranded copper wire only. Use wires that can withstand temperatures of at least 80°C.
Terminal Torque Setting
| Model Group | Torque |
|---|---|
| LRS-35 to LRS-200 | 5–6 kgf-cm (4.4–5.2 Lb-in) |
| LRS-350 to LRS-600 | 8–10 kgf-cm (7–9 Lb-in) |
| LRS-1200 | 8–10 kgf-cm (M3.5 for AC input, M5 for DC output) |
Recommended screwdriver: 3 mm or 4 mm slotted type depending on terminal size.
Input Configuration
| LRS-35 / 50 / 75 / 100 / 150F | Universal AC input 85–264 VAC |
| LRS-150 / 200 / 350 / 450 / 600 | Selectable 90–132 VAC / 180–264 VAC by switch |
| LRS-1200 | 180–305 VAC input |
| Frequency Range | 47–63 Hz |
Output Voltage Adjustment
All LRS models include a front-panel DC output voltage adjustment potentiometer (+V ADJ) and a power-on LED indicator. The rated output voltage can be adjusted within the voltage adjustment range specified for each model. Output current and output wattage must not exceed the rated value on its specification.
The actual wiring should follow the wiring diagram provided in the LRS Series installation manual. Use copper wire only and ensure all strands enter the terminal connection securely.
Safety & Compliance
LRS Series Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the LRS Series power supply.
- Risk of electrical shock and energy hazard. All failure should be examined by a qualified technician. Do not remove the case of the power supply yourself.
- Connecting both the primary and the secondary sides together is not allowed — risk of electric arcs and electric shock (danger to life).
- Risk of burn hazard. Do not touch the unit in operation and shortly after disconnection.
- Risk of fire and short circuit. The openings should be protected from foreign objects or dripping liquids.
- The FG (Frame Ground) must be connected to PE (Protective Earth).
- Output current and output power must not exceed the rated value on its specification.
- Before commencing any installation, maintenance or modification work, disconnect the system from supply voltage. Make sure that inadvertent connection in circuit will be impossible.
- For continued protection against risk of fire, replace only with the same type and rating of fuse.
- The power supply is considered a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets EMC directives.
- This power supply does not meet the harmonic current requirements outlined by EN61000-3-2 for EU end-devices connected to public mains 220VAC or greater with average input power above 75W. Please refer to the datasheet for exceptions.
Note: Pollution Degree 2 applies where there is only non-conductive pollution that might temporarily become conductive due to occasional condensation. Generally refers to dry, well-ventilated locations, such as control cabinets.
Applications
LRS Series Industrial Applications
The LRS Series is suitable for industrial automation machinery, industrial control systems, mechanical and electrical equipment, electronic instruments and household appliances.
Industrial Automation Machinery
Industrial Control Systems
Mechanical & Electrical Equipment
Electronic Instruments
Household Appliances
LED Lighting
Security Systems
Communication Equipment
Test & Measurement
Next Step
Explore the LRS Series
Browse all LRS Series enclosed switching power supply products, or return to the Industrial Power Supply category page.
Support
LRS Series FAQ
What is the DAPPRA LRS Series?
The DAPPRA LRS Series is a low-profile single-output enclosed switching power supply series. It covers 35W to 1200W power ratings with 3.3V, 4.2V, 5V, 12V, 15V, 24V, 27V, 36V and 48V output configurations, with a 30mm 1U low-profile design.
What is the input voltage range of the LRS Series?
Most LRS models support a universal AC input range of 85–264 VAC or 120–373 VDC. The LRS-150 and LRS-350 and above use selectable AC input 90–132 VAC / 180–264 VAC by switch. The LRS-1200 supports 180–305 VAC input.
What is the difference between the LRS standard series and the LRS-N2 series?
The LRS-N2 series (LRS-100N2, LRS-200N2, LRS-350N2, LRS-600N2) is designed for high peak power applications, providing up to 200% short-duration peak power for motor and electromechanical loads requiring much higher power during startup.
Which LRS models use a built-in cooling fan?
The LRS-35, LRS-50, LRS-75, LRS-100, LRS-150, LRS-200 series use free air convection cooling without a fan. The LRS-350, LRS-450, LRS-600 and LRS-1200 series use forced air cooling with built-in DC fan and Fan ON/OFF control.
What is the efficiency of the LRS Series?
Efficiency ranges from 79.5% (LRS-350-3.3) up to 94% (LRS-1200 models), depending on the model and output voltage.
What is the no-load power consumption of the LRS Series?
No-load power consumption is below 0.2W for LRS-35, below 0.3W for LRS-75 and LRS-100, below 0.5W for LRS-100N2 and LRS-150F, below 0.75W for LRS-50/150/200/350/450 and below 1W for LRS-350N2 and LRS-600N2.
What is the operating temperature range of the LRS Series?
LRS-35 through LRS-100 series operate from -30°C to +70°C with derating above +50°C. LRS-200/350/450/600 series operate from -25°C or -20°C to +70°C. LRS-1200 operates from -30°C to +70°C.
What is the terminal pin assignment of the LRS Series?
The standard LRS terminal assignment is: Pin 1 = AC/L, Pin 2 = AC/N, Pin 3 = FG (Frame Ground), Pins 4-6 = DC OUTPUT -V, Pins 7-9 = DC OUTPUT +V. The exact pin count depends on the model (LRS-35/50/75 use 5 pins, LRS-100 uses 7 pins, LRS-150 and above use 9 pins).
What certifications does the LRS Series have?
The LRS Series is certified to IEC/UL 62368-1, TUV BS EN/EN62368-1, BS EN/EN60335-1, BS EN/EN61558-1/-2-16, GB 4943.1, BSMI CNS15598-1, EAC TP TC 004 and BIS IS13252. The series also meets BS EN/EN61000-6-2 industrial immunity level and is SEMI F47 approved on some models.
What is the warranty period for the LRS Series?
All LRS Series models come with a 3 years warranty.
How do I choose the right LRS Series model?
Select the LRS model according to the required output power (35W to 1200W), output voltage, whether peak power capability is needed (choose N2 series), whether full-range or selectable AC input is required, and available mounting space.