MEAN WELL SCP-75 Series 75W Power Supply with Battery Connection & Temperature Compensation

Overview

The MEAN WELL SCP-75 Series is a compact 75W single-output AC/DC switching power supply designed for systems that require regulated DC output together with battery connection, charging-voltage temperature compensation and output voltage status detection. It accepts a universal 85–264VAC input or 120–370VDC input and is cooled by free-air convection.

The series is available in two models. SCP-75-12 provides a 13.8V output rated at 5.4A with 74.5W rated power, while SCP-75-24 provides a 27.6V output rated at 2.7A with 74.5W rated power. Both models provide an adjustable output range of +15% / -5%, allowing the output voltage to be matched to the intended battery-supported DC system.

A dedicated B+ / B- battery connection is provided, while the main DC output is available through the +V / -V terminals. The SCP-75 Series also supports connection of an optional NTC temperature sensor through CN2, allowing the charging voltage to change according to ambient temperature. If the temperature sensor is not used, the charger continues to operate normally.

For status monitoring, the series provides an output voltage detection signal. The L signal indicates approximately output voltage +0.2–0.7V during AC OK operation and falls to 0V during AC failure, allowing external equipment to detect the supply status.

Built-in protection includes short circuit, overload, overvoltage and battery reverse-polarity protection. The series also features no-load power consumption below 0.75W, LED power indication and a compact 159 × 97 × 38 mm enclosure, making it suitable for battery-supported DC systems that require power delivery, battery connection and supply-status monitoring.

Features

• 75W-class single-output AC/DC switching power supply with dedicated battery connection
• Universal 85–264VAC input and 120–370VDC input range, with typical efficiency of 80% for SCP-75-12 and 84% for SCP-75-24
• SCP-75-12 provides 13.8V output rated at 5.4A, while SCP-75-24 provides 27.6V output rated at 2.7A
• Short-duration peak output capability up to 6.5A for SCP-75-12 and 3.2A for SCP-75-24 for up to 5 seconds under the specified duty-cycle conditions
• Output voltage adjustable from -5% to +15% of the rated value for system and battery-voltage requirements
• Optional NTC temperature sensor connection supports compensation of battery charging voltage according to ambient temperature
• Output voltage detection signal provides AC OK / AC Fail status information, with short circuit, overload, overvoltage and battery reverse-polarity protection

Need help choosing between the 13.8V and 27.6V versions? Compare SCP-75-12 and SCP-75-24 below.

Model Selection Guide for SCP-75 Series

The MEAN WELL SCP-75 Series includes two compact AC/DC power supplies with dedicated battery connection and charging-voltage temperature compensation capability: SCP-75-12 and SCP-75-24.

Model selection is primarily determined by the required DC output voltage and continuous load current. Both models share the same 85–264VAC or 120–370VDC input range, battery connection, optional NTC temperature compensation, output voltage detection signal, protection functions and 159 × 97 × 38 mm enclosure.

SCP-75-12 – 13.8V Output

The MEAN WELL SCP-75-12 provides a 13.8V output rated at 5.4A with 74.5W rated power. Typical efficiency is 80%, and the output voltage can be adjusted approximately -5% to +15% from the rated value.

Choose SCP-75-12 when the connected DC load requires a nominal output around 13.8V and the continuous load current does not exceed 5.4A. For short-duration loads, the model can provide up to 6.5A for 5 seconds, subject to the specified duty-cycle and average-power limits.

SCP-75-24 – 27.6V Output

The MEAN WELL SCP-75-24 provides a 27.6V output rated at 2.7A with 74.5W rated power. Typical efficiency is 84%, and the output voltage can also be adjusted approximately -5% to +15% from the rated value.

Choose SCP-75-24 when the system requires a nominal output around 27.6V and the continuous load current is within the 2.7A rated output capability. Short-duration loads up to 3.2A for 5 seconds are supported under the specified peak-load conditions.

How to Choose Between SCP-75-12 and SCP-75-24

Start with the required DC system voltage. Choose SCP-75-12 for a 13.8V output or SCP-75-24 for a 27.6V output.

Then confirm the continuous load current. SCP-75-12 provides up to 5.4A, while SCP-75-24 provides up to 2.7A. If the application includes short-duration current peaks, also verify the 5-second peak capability and ensure the average output power remains within the rated value.

Both models provide dedicated B+ and B- battery connections and support an optional NTC temperature sensor through CN2. When the sensor is connected, the output voltage changes with ambient temperature to provide charging-voltage temperature compensation. If the sensor is not used, the charger continues to operate normally.

Output Voltage Detection and Monitoring

Both SCP-75 models provide an L output voltage detection signal for external status monitoring. Under normal AC input, the L signal is approximately the output voltage plus 0.2–0.7V. During AC failure, the signal falls to 0V.

This discrete status signal allows external monitoring circuitry to distinguish between AC OK and AC failure conditions.

Need help choosing the correct SCP-75 model? Start with the required output voltage and continuous load current, then check any short-duration peak-current requirement and whether temperature-compensated charging-voltage control is needed.

Related MEAN WELL SCP Series Power Supplies

If the SCP-75 Series provides more output capacity than your application requires, compare the lower-power MEAN WELL SCP Series options according to output voltage, load current, battery connection and monitoring requirements:

• SCP-35 Series – Lower-power SCP Series option for applications with lighter load requirements.
• SCP-50 Series – Mid-power SCP Series option for systems requiring less output capacity than SCP-75.

Need help choosing the right MEAN WELL SCP Series power supply?
Compare SCP-35, SCP-50 and SCP-75 based on required output voltage, continuous load current, power level, battery connection and monitoring requirements.

Battery Connection, Temperature Compensation and Status Monitoring

The MEAN WELL SCP-75 Series provides dedicated battery connections, optional charging-voltage temperature compensation and an output voltage detection signal for battery-supported DC systems. These functions are available on both SCP-75-12 and SCP-75-24.

Battery Connection

The external battery connects through the dedicated B+ and B- terminals, while the main DC load connects to the +V and -V output terminals.

The battery terminals and main output terminals serve different functions, so the battery should be connected only to the designated B+ / B- connections.

Charging-Voltage Temperature Compensation

An optional NTC temperature sensor can be connected through CN2 to compensate the charging voltage according to ambient temperature.

With the reference 100kΩ thermistor specified by MEAN WELL, the output voltage changes with temperature. For SCP-75-12, the reference output is approximately 14.4V at 0°C, 13.8V at 25°C and 13.2V at 50°C. For SCP-75-24, the corresponding values are approximately 29.3V, 27.6V and 26.4V.

If the temperature sensor is not connected, the charger continues to operate normally.

Output Voltage Detection

The SCP-75 Series provides an L output voltage detection signal for external status monitoring.

Under normal AC input, the L signal is approximately output voltage +0.2 to 0.7V. When AC input fails, the L signal falls to 0V.

This signal can be used by an external monitoring circuit or controller to distinguish between normal AC operation and AC failure.

Battery Reverse-Polarity Protection

The SCP-75 Series includes battery reverse-polarity protection by fuse.

The series also provides short-circuit, overload and overvoltage protection for the DC output.

Need wiring and mechanical details? Continue below for the SCP-75 mechanical drawing, terminal assignments, CN2 temperature sensor connection, dimensions and installation information.

Mechanical Dimensions and Installation

The MEAN WELL SCP-75 Series uses an enclosed chassis for integration into DC power and battery-supported equipment. It is cooled by free-air convection and provides separate connections for AC input, regulated DC output, external battery and the optional temperature sensor.

Dimensions

The SCP-75 Series measures 159 × 97 × 38 mm (L × W × H).

The mechanical drawing shows the enclosure dimensions, mounting-hole locations, AC input terminal block, DC output terminals, battery connections, CN2 temperature-sensor connector, LED indicator and output-voltage adjustment point.

AC Input and DC Output Connections

AC input is connected through TB1, which provides terminals for:

• AC/L: AC line input
• AC/N: AC neutral input
• FG: Frame ground

The regulated DC output is available through TB2, with dedicated +V and -V terminals for the connected load.

Battery Connections

The SCP-75 Series provides dedicated B+ and B- connections for an external battery.

The battery should be connected only to the designated B+ / B- connections. The +V / -V terminals are intended for the regulated DC output and should not be used as battery connections.

CN2 Temperature Sensor Connection

The CN2 connector is provided for an optional NTC temperature sensor used for charging-voltage temperature compensation.

CN2 uses a JST B2B-XH or equivalent connector, with a compatible JST XHP housing and JST SXH-001T-P0.6 terminal or equivalent.

If the temperature sensor is not connected, the charger continues to operate normally.

Mounting and Cooling

The SCP-75 Series is cooled by free-air convection.

The mechanical drawing provides the mounting-hole positions and enclosure dimensions required for equipment integration. Installation should allow the unit to operate within the specified temperature and derating conditions.

Operating Environment and Derating

The SCP-75 Series operates from -20°C to +60°C.

Output derating is required at higher ambient temperatures, and additional derating applies at low AC input voltage. The applicable load limits should be checked when the power supply is used near the upper operating-temperature range or at the lower end of the AC input range.

Need complete mechanical and wiring details? Review the SCP-75 mechanical drawing for mounting dimensions, terminal locations, battery connections, CN2 sensor connection and derating information.

Applications

The MEAN WELL SCP-75 Series is designed for DC power systems that require regulated output together with external battery connection, charging-voltage temperature compensation and basic power-status detection.

With SCP-75-12 providing 13.8V output and SCP-75-24 providing 27.6V output, the series can be integrated into equipment where the required load voltage, battery connection and monitoring functions match the electrical characteristics of the selected model.

• Battery-supported DC equipment requiring regulated DC output together with a dedicated external battery connection
• Battery charging systems using optional NTC temperature compensation to adjust charging voltage according to ambient temperature
• Power monitoring equipment using the output voltage detection signal to distinguish normal AC operation from AC failure
• Control and electronic equipment requiring 13.8V or 27.6V regulated DC power with battery support
• Enclosed electronic systems requiring a 159 × 97 × 38 mm power supply with free-air convection cooling

Need safety and compliance details for your project? Continue below to review protection functions, safety approvals, EMC compliance and operating conditions for the SCP-75 Series.

Certifications and Safety

The MEAN WELL SCP-75 Series is a compact AC/DC switching power supply with battery connection, designed as a component for integration into final equipment. Its safety, EMC and protection characteristics should be considered together with the requirements of the completed system.

Safety and EMC Compliance

Key safety and EMC information for the SCP-75 Series includes:

• UL62368-1 approved
• CB scheme based on IEC62368-1
• Design reference to BS EN/EN62368-1
• EAC TP TC 004 safety compliance
• BS EN/EN55032 (CISPR32) Class B EMC emission compliance
• BS EN/EN61000-3-2 and EN61000-3-3 EMC requirements
• BS EN/EN61000-4 series and BS EN/EN55035 EMC immunity requirements for light industrial environments
• EAC TP TC 020 EMC compliance

Isolation and Electrical Safety

Specified withstand voltage levels are:

• Input to output: 3KVAC
• Input to FG: 2KVAC
• Output to FG: 0.5KVAC

Isolation resistance is specified at 100MΩ between input-output, input-FG and output-FG when tested at 500VDC, 25°C and 70% RH.

Protection Functions

The SCP-75 Series provides protection against:

• Short circuit
• Overload
• Overvoltage
• Battery reverse polarity by fuse

Overload protection operates in hiccup mode and automatically recovers after the fault condition is removed. Overvoltage protection shuts down the output and requires the input power to be cycled for recovery.

Operating Environment and Final Equipment Integration

The SCP-75 Series operates from -20°C to +60°C, with output derating required according to ambient temperature and input voltage conditions.

The power supply is intended as a component for installation inside final equipment. After integration, the completed equipment should be reconfirmed to ensure that applicable EMC requirements are still met.

Need more product details before sending an inquiry? Review the model comparison, battery connection, temperature compensation, output voltage detection, mechanical dimensions and installation information above.