MEAN WELL SDR-120 series: Industrial DIN Rail Power Supply - SDR-120-48

Description

MEAN WELL SDR-120-48 is a single-output industrial DIN rail power supply rated at 48 V DC, 2.5 A and 120 W. It combines an adjustable output, free-air convection and mounting on TS-35/7.5 or TS-35/15 rail. Built-in active PFC and a DC OK relay contact support industrial control installations. The specified 180 W peak is a short-duration capability, subject to the loading patterns and input/temperature curves below.

Product Datasheet

Download MEAN WELL SDR-120 Datasheet (PDF)

The SDR-120 section is on PDF pages 4, 5, 6. Refer to the complete mechanical drawings and notes when planning installation.

Model and DC Output

Complete model SDR-120-48; SDR-120 catalogue revision 2025-06-09. The final code denotes 48 V nominal output.
Continuous rating 48 V DC / 2.5 A / 120 W; output-current range 0–2.5 A.
Voltage adjustment 48–55 V, using +V ADJ. Observe the model’s current and power limits when adjusting.
Ripple and noise 120 mVp-p maximum; 20 MHz bandwidth, a 12-inch twisted pair and parallel 0.1 µF / 47 µF termination capacitors.
Voltage tolerance ±1.0%, including setup tolerance, line regulation and load regulation.
Line / load regulation ±0.5% / ±1.0%, respectively.
Typical efficiency 90.5% at the default 230 VAC input, rated-load and 25°C ambient test conditions.

Use the published complete-model continuous and peak ratings; the series number and family-wide efficiency headline do not replace the individual model values.

Peak Loading and Repetition Conditions

Peak current / power 3.75 A / 180 W, for a maximum of 3 seconds. The catalogue describes this as 150% peak-load capability.
Loading pattern 1 The published waveform alternates 120 W for 100 seconds with 180 W for 3 seconds.
Loading pattern 2 The second waveform alternates 60 W for 15 seconds with 180 W for 3 seconds.

These are the two specific loading patterns on PDF page 6, not permission to repeat the peak at an arbitrary duty cycle. Keep every peak within 3 seconds and apply the applicable peak-temperature curve and input derating. Continuous loading must follow the separate continuous curve.

The 180 W peak does not replace the 120 W continuous rating, and overload protection is not a continuous operating mode.

Input and Timing

Input range 88–264 VAC or 124–370 VDC; AC frequency 47–63 Hz.
Typical AC current 1.4 A at 115 VAC; 0.7 A at 230 VAC.
Typical inrush current 35 A at 115 VAC; 70 A at 230 VAC.
Setup / rise at full load 1500 / 60 ms at 230 VAC; 3000 / 60 ms at 115 VAC.
Typical hold-up at full load 20 ms at 230 VAC; 20 ms at 115 VAC.
Leakage current Less than 1 mA at 240 VAC.
Power factor, typical 0.93 at 230 VAC and 0.96 at 115 VAC, at full load; built-in active PFC.

Unless otherwise specified, parameters are measured at 230 VAC input, rated load and 25°C ambient. Low input voltage requires load derating.

Protection

Overload: lower range At 110–150% of rated output power, the catalogue describes operation for more than 3 seconds followed by output shutdown.
Short-circuit / overload: higher range Above 150% of rated power, constant-current limiting has automatic recovery within the first 3 seconds; after 3 seconds the output shuts down.
Overvoltage 56–65 V; output shuts down, then re-power to recover.
Overtemperature sensing 95 ±5°C, detected by TSW on power-switch heatsink. This is an internal sensing temperature, not an ambient rating.
Overtemperature recovery Output shuts down and recovers automatically after temperature falls.

The overload time description is a protection response. It does not extend the separately specified 3-second maximum peak-loading period.

DC OK Relay Contact

Relay closed Power supply on / DC OK.
Relay open Power supply off / DC fail.
Contact ratings, maximum 60 VDC / 0.3 A, 30 VDC / 1 A, or 30 VAC / 0.5 A, for resistive loads, as listed in the specification. The function table also lists the 30 V / 1 A resistive rating.
Connection TB2 pins 1 and 2 are the relay contact. They are separate from TB2 pin 3 (−V) and pin 4 (+V).

The contact indicates status; it is not a specified powered logic-voltage output. Select the monitoring circuit within the applicable resistive-load contact rating.

Cooling, Derating and Environment

Cooling / orientation Free-air convection; the published temperature curves are for vertical mounting.
Working ambient range -25 to +70°C, subject to the input and thermal conditions below.
Continuous temperature curve The 48 V branch shows 100% load up to 60°C, then decreases along the plotted line to 75% at 70°C.
Short-peak temperature curve The 48 V branch shows the 150% short-peak level up to 60°C, decreasing to 125% at 70°C. The 3-second limit and published absolute peak-power rating still apply.
Input-voltage curve, 60 Hz The graph shows 90% load at 88 VAC, rising to 100% at 100 VAC. The 100% plateau continues through 264 VAC.
Working humidity 20–95% RH, non-condensing.
Storage −40 to +85°C; 10–95% RH.
Temperature coefficient ±0.03%/°C over 0–50°C.
Vibration 10–500 Hz, 2G, 10 min/cycle and 60 min on each X, Y and Z axis; mounting compliance IEC60068-2-6.
High-altitude derating For this fanless model, reduce the permitted ambient temperature by 3.5°C per 1000 m above 2000 m, as specified by the catalogue footnote.

Apply the input and temperature limits together. The maximum ambient temperature is not a full-load rating, and the short-peak curve must not be used as the continuous curve.

Dimensions, Wiring and Installation

Body size 40 × 125.2 × 113.5 mm (W × H × D), case 992A; general drawing tolerance ±1 mm.
DIN rail compatibility TS-35/7.5 or TS-35/15; the mechanical drawing shows a 35 mm rail profile.
Input terminal block TB1 pin 1: FG; pin 2: AC/N; pin 3: AC/L.
Output terminal block TB2 pins 1,2: DC OK relay contact; pin 3: −V; pin 4: +V.
Indication / adjustment The mechanical drawing identifies the DC OK indicator and +V ADJ output-voltage control.
Recommended installation clearances For permanent full-power loading: 40 mm above, 20 mm below, and 5 mm on both left and right sides. When the adjacent device is a heat source, 15 mm clearance is recommended.
Catalogue unit weight 670 g per unit, from the explicit PACKING reference. Full entry: 0.67 kg; 20 pcs / 14.4 kg / 1.0 CUFT. Carton gross mass is not the unit weight.

Use the exact terminal numbering and rail-latch geometry on PDF page 5; connect FG protective earth and follow the supplied unit’s installation instructions and terminal markings. Rail compatibility does not mean that a rail is supplied. The assigned pages list no separately orderable MEAN WELL rail, bracket, cover or connector accessory code.

Safety, Insulation and EMC

Catalogue-listed safety approvals UL508; TUV BS EN/EN62368-1; AS/NZS62368.1; EAC TP TC004. BSMI CNS15598-1 is also listed.
Additional standards statement Meets BS EN/EN60204-1.
Withstand voltage Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC. Output–DC OK contact: 0.5 kVAC.
Insulation resistance Greater than 100 MΩ for input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH.
EMC emissions BS EN/EN55032 (CISPR32); BS EN/EN61204-3 Class B; BS EN/EN61000-3-2 and -3; EAC TP TC020; CNS15936 Class B.
EMC immunity and voltage-dip compliance BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN55035; BS EN/EN61000-6-2 (BS EN/EN50082-2); BS EN/EN61204-3, heavy-industry level; EAC TP TC020; SEMI F47 approved.

The power supply is a component intended for final equipment. Reconfirm EMC compliance in the completed equipment; the component listings do not certify the whole installation.

Reliability and Manufacturer Information

MTBF reference 1764.6 K hours minimum under Telcordia SR-332 (Bellcore); 292.1 K hours minimum under MIL-HDBK-217F at 25°C. These are reliability references, not a guaranteed service life.
Factory test / warranty The catalogue lists 100% full-load burn-in testing and a three-year warranty, subject to applicable manufacturer terms.

MEAN WELL SDR-120 series: Industrial DIN Rail Power Supply - SDR-120-48

Product form

MEAN WELL SDR-120-48 is a single-output industrial DIN rail power supply rated at 48 V DC, 2.5 A and 120... Read more

$120.75 Incl. VAT

    • Guaranteed secure & safe checkout.

      shop pay

    Description

    MEAN WELL SDR-120-48 is a single-output industrial DIN rail power supply rated at 48 V DC, 2.5 A and 120 W. It combines an adjustable output, free-air convection and mounting on TS-35/7.5 or TS-35/15 rail. Built-in active PFC and a DC OK relay contact support industrial control installations. The specified 180 W peak is a short-duration capability, subject to the loading patterns and input/temperature curves below.

    Product Datasheet

    Download MEAN WELL SDR-120 Datasheet (PDF)

    The SDR-120 section is on PDF pages 4, 5, 6. Refer to the complete mechanical drawings and notes when planning installation.

    Model and DC Output

    Complete model SDR-120-48; SDR-120 catalogue revision 2025-06-09. The final code denotes 48 V nominal output.
    Continuous rating 48 V DC / 2.5 A / 120 W; output-current range 0–2.5 A.
    Voltage adjustment 48–55 V, using +V ADJ. Observe the model’s current and power limits when adjusting.
    Ripple and noise 120 mVp-p maximum; 20 MHz bandwidth, a 12-inch twisted pair and parallel 0.1 µF / 47 µF termination capacitors.
    Voltage tolerance ±1.0%, including setup tolerance, line regulation and load regulation.
    Line / load regulation ±0.5% / ±1.0%, respectively.
    Typical efficiency 90.5% at the default 230 VAC input, rated-load and 25°C ambient test conditions.

    Use the published complete-model continuous and peak ratings; the series number and family-wide efficiency headline do not replace the individual model values.

    Peak Loading and Repetition Conditions

    Peak current / power 3.75 A / 180 W, for a maximum of 3 seconds. The catalogue describes this as 150% peak-load capability.
    Loading pattern 1 The published waveform alternates 120 W for 100 seconds with 180 W for 3 seconds.
    Loading pattern 2 The second waveform alternates 60 W for 15 seconds with 180 W for 3 seconds.

    These are the two specific loading patterns on PDF page 6, not permission to repeat the peak at an arbitrary duty cycle. Keep every peak within 3 seconds and apply the applicable peak-temperature curve and input derating. Continuous loading must follow the separate continuous curve.

    The 180 W peak does not replace the 120 W continuous rating, and overload protection is not a continuous operating mode.

    Input and Timing

    Input range 88–264 VAC or 124–370 VDC; AC frequency 47–63 Hz.
    Typical AC current 1.4 A at 115 VAC; 0.7 A at 230 VAC.
    Typical inrush current 35 A at 115 VAC; 70 A at 230 VAC.
    Setup / rise at full load 1500 / 60 ms at 230 VAC; 3000 / 60 ms at 115 VAC.
    Typical hold-up at full load 20 ms at 230 VAC; 20 ms at 115 VAC.
    Leakage current Less than 1 mA at 240 VAC.
    Power factor, typical 0.93 at 230 VAC and 0.96 at 115 VAC, at full load; built-in active PFC.

    Unless otherwise specified, parameters are measured at 230 VAC input, rated load and 25°C ambient. Low input voltage requires load derating.

    Protection

    Overload: lower range At 110–150% of rated output power, the catalogue describes operation for more than 3 seconds followed by output shutdown.
    Short-circuit / overload: higher range Above 150% of rated power, constant-current limiting has automatic recovery within the first 3 seconds; after 3 seconds the output shuts down.
    Overvoltage 56–65 V; output shuts down, then re-power to recover.
    Overtemperature sensing 95 ±5°C, detected by TSW on power-switch heatsink. This is an internal sensing temperature, not an ambient rating.
    Overtemperature recovery Output shuts down and recovers automatically after temperature falls.

    The overload time description is a protection response. It does not extend the separately specified 3-second maximum peak-loading period.

    DC OK Relay Contact

    Relay closed Power supply on / DC OK.
    Relay open Power supply off / DC fail.
    Contact ratings, maximum 60 VDC / 0.3 A, 30 VDC / 1 A, or 30 VAC / 0.5 A, for resistive loads, as listed in the specification. The function table also lists the 30 V / 1 A resistive rating.
    Connection TB2 pins 1 and 2 are the relay contact. They are separate from TB2 pin 3 (−V) and pin 4 (+V).

    The contact indicates status; it is not a specified powered logic-voltage output. Select the monitoring circuit within the applicable resistive-load contact rating.

    Cooling, Derating and Environment

    Cooling / orientation Free-air convection; the published temperature curves are for vertical mounting.
    Working ambient range -25 to +70°C, subject to the input and thermal conditions below.
    Continuous temperature curve The 48 V branch shows 100% load up to 60°C, then decreases along the plotted line to 75% at 70°C.
    Short-peak temperature curve The 48 V branch shows the 150% short-peak level up to 60°C, decreasing to 125% at 70°C. The 3-second limit and published absolute peak-power rating still apply.
    Input-voltage curve, 60 Hz The graph shows 90% load at 88 VAC, rising to 100% at 100 VAC. The 100% plateau continues through 264 VAC.
    Working humidity 20–95% RH, non-condensing.
    Storage −40 to +85°C; 10–95% RH.
    Temperature coefficient ±0.03%/°C over 0–50°C.
    Vibration 10–500 Hz, 2G, 10 min/cycle and 60 min on each X, Y and Z axis; mounting compliance IEC60068-2-6.
    High-altitude derating For this fanless model, reduce the permitted ambient temperature by 3.5°C per 1000 m above 2000 m, as specified by the catalogue footnote.

    Apply the input and temperature limits together. The maximum ambient temperature is not a full-load rating, and the short-peak curve must not be used as the continuous curve.

    Dimensions, Wiring and Installation

    Body size 40 × 125.2 × 113.5 mm (W × H × D), case 992A; general drawing tolerance ±1 mm.
    DIN rail compatibility TS-35/7.5 or TS-35/15; the mechanical drawing shows a 35 mm rail profile.
    Input terminal block TB1 pin 1: FG; pin 2: AC/N; pin 3: AC/L.
    Output terminal block TB2 pins 1,2: DC OK relay contact; pin 3: −V; pin 4: +V.
    Indication / adjustment The mechanical drawing identifies the DC OK indicator and +V ADJ output-voltage control.
    Recommended installation clearances For permanent full-power loading: 40 mm above, 20 mm below, and 5 mm on both left and right sides. When the adjacent device is a heat source, 15 mm clearance is recommended.
    Catalogue unit weight 670 g per unit, from the explicit PACKING reference. Full entry: 0.67 kg; 20 pcs / 14.4 kg / 1.0 CUFT. Carton gross mass is not the unit weight.

    Use the exact terminal numbering and rail-latch geometry on PDF page 5; connect FG protective earth and follow the supplied unit’s installation instructions and terminal markings. Rail compatibility does not mean that a rail is supplied. The assigned pages list no separately orderable MEAN WELL rail, bracket, cover or connector accessory code.

    Safety, Insulation and EMC

    Catalogue-listed safety approvals UL508; TUV BS EN/EN62368-1; AS/NZS62368.1; EAC TP TC004. BSMI CNS15598-1 is also listed.
    Additional standards statement Meets BS EN/EN60204-1.
    Withstand voltage Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC. Output–DC OK contact: 0.5 kVAC.
    Insulation resistance Greater than 100 MΩ for input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH.
    EMC emissions BS EN/EN55032 (CISPR32); BS EN/EN61204-3 Class B; BS EN/EN61000-3-2 and -3; EAC TP TC020; CNS15936 Class B.
    EMC immunity and voltage-dip compliance BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN55035; BS EN/EN61000-6-2 (BS EN/EN50082-2); BS EN/EN61204-3, heavy-industry level; EAC TP TC020; SEMI F47 approved.

    The power supply is a component intended for final equipment. Reconfirm EMC compliance in the completed equipment; the component listings do not certify the whole installation.

    Reliability and Manufacturer Information

    MTBF reference 1764.6 K hours minimum under Telcordia SR-332 (Bellcore); 292.1 K hours minimum under MIL-HDBK-217F at 25°C. These are reliability references, not a guaranteed service life.
    Factory test / warranty The catalogue lists 100% full-load burn-in testing and a three-year warranty, subject to applicable manufacturer terms.

    Recently viewed products

      Footer image

      © 2026 MEAN WELL, ,

      • US (USD $) US (USD $)
      • Ach Direct Debit
      • AliPay
      • Amazon
      • American Express
      • Apple Pay
      • Diners Club
      • Discover
      • Google Pay
      • Mastercard
      • PayPal
      • Shop Pay
      • USDC
      • Visa