MEAN WELL PSC-35 Series 35W Security Power Supply with Battery Charger & UPS Function

Overview of MEAN WELL PSC-35 Series

The MEAN WELL PSC-35 Series combines a regulated main DC output, dedicated battery charging output and backup control function in one compact AC/DC power supply. It is designed for applications that require normal DC operation together with automatic battery-supported backup when AC mains power is interrupted.

During normal AC operation, the PSC-35 supplies power to the connected load while charging the external battery at the same time. If AC input fails, the connected battery continues supplying the load through the built-in backup control circuit, allowing critical low-power equipment to remain operational during temporary mains interruption.

The series includes two main models. PSC-35A is designed for 12V battery systems and provides a 13.8V main output with a dedicated 13.8V charging output. PSC-35B is intended for 24V battery systems and provides a 27.6V main output with a corresponding 27.6V charging output.

Both models also provide AC OK and Battery Low alarm outputs, together with battery cut-off and basic output protection functions for integration into compact security and backup power systems.

Features

• 35W AC/DC power supply with dedicated main output and battery charging output
• Universal 90–264VAC input with 127–370VDC input capability
• PSC-35A provides 13.8V main output for 12V battery systems
• PSC-35B provides 27.6V main output for 24V battery systems
• Automatic battery-supported backup operation during AC mains interruption
• AC OK and Battery Low TTL open-collector alarm outputs for external monitoring
• Battery cut-off and battery reverse-polarity protection
• Overload and overvoltage protection
• Fanless free-air convection cooling
• Available as PCB type or enclosed type with L-bracket and cover

Need help choosing the correct battery system voltage? Compare PSC-35A and PSC-35B below.

Model Selection Guide for PSC-35 Series

The MEAN WELL PSC-35 Series includes two 35W security power supply models with integrated battery charger and UPS backup function. Selection between PSC-35A and PSC-35B is primarily determined by the required DC output voltage and battery system voltage.

Both models share the same 90–264VAC / 127–370VDC input range, AC OK and Battery Low alarm outputs, battery backup control, overload and overvoltage protection, free-air convection cooling, and PCB or enclosed installation options. The main differences are output voltage, rated current, battery charging current and battery protection thresholds.

PSC-35A for 12V Battery Backup Systems

The MEAN WELL PSC-35A is designed for 12V battery systems. It provides a 13.8V main output rated at 1.7A together with a 13.8V battery charging output rated at 0.9A.

The main output voltage can be adjusted from 12V to 15V. Battery Low indication is triggered below 11V, while battery cut-off is specified at 10 ±0.5V.

PSC-35A is generally selected for 12V security systems, alarm panels, access control equipment, emergency lighting and other applications requiring battery-backed 12VDC power.

PSC-35B for 24V Battery Backup Systems

The MEAN WELL PSC-35B is intended for 24V battery systems. It provides a 27.6V main output rated at 0.85A and a 27.6V battery charging output rated at 0.45A.

The main output voltage can be adjusted from 24V to 29V. Battery Low indication is triggered below 22V, while battery cut-off is specified at 20 ±1V.

PSC-35B is generally selected where the connected equipment and backup battery architecture require a 24VDC system.

How to Choose Between PSC-35A and PSC-35B

For most applications, start with the required battery system voltage. Choose PSC-35A for 12V systems and PSC-35B for 24V systems.

Then confirm the required load current and battery charging current. PSC-35A provides higher available current for 12V systems, while PSC-35B provides the corresponding output and charging capability for 24V systems.

When AC mains power is available, the PSC-35 supplies the connected load while charging the battery. If AC input fails, the connected battery continues supplying the load through the built-in backup control circuit.

Alarm Monitoring and Installation Options

Both PSC-35 models provide AC OK and Battery Low alarm signals as TTL open-collector outputs. These signals can be connected to external monitoring or control equipment, with a maximum sink current of 30mA at 50VDC.

The PSC-35 Series is available as a compact PCB type or as an enclosed type with L-bracket and cover, allowing system designers to select the mechanical configuration that best suits the final equipment enclosure.

Need help choosing the correct PSC-35 model? Start with the required 12V or 24V battery system, then confirm load current, battery charging current, backup requirements and preferred mechanical configuration.

Related MEAN WELL PSC Series and Security Power Supplies

For security systems, access control, alarm panels and battery backup applications, the following MEAN WELL power supplies can be compared with the PSC-35 Series according to required output power, battery system voltage, installation format, charging current and monitoring requirements:

• PSC-60 Series – Higher-power PSC Series security power supply with integrated battery charger and UPS backup function for applications requiring more output capacity than PSC-35.
• PSC-100 Series – 100W-class PSC Series power supply for battery-backed security, alarm and monitoring systems requiring higher load and charging capacity.
• PSC-160 Series – Higher-capacity PSC Series solution for security and DC backup applications that exceed the power range of PSC-35, PSC-60 or PSC-100.
• DRC-40 Series – Compact DIN rail AC/DC power supply with integrated battery charger and UPS function for 12V and 24V backup power systems.
• DRC-60 Series – 60W DIN rail security power supply with battery charger and UPS backup function for applications requiring DIN rail installation.
• DRS-240 Series – Intelligent DIN rail security power supply with integrated battery charger, DC UPS, monitoring and communication functions for more advanced backup power systems.

Need help selecting the right MEAN WELL security power supply?
Compare PSC-35, PSC-60, PSC-100, PSC-160, DRC and DRS Series based on required output power, 12V or 24V battery system, charging current, UPS backup function, installation format and monitoring requirements.

Battery Backup and Alarm Monitoring Functions

The MEAN WELL PSC-35 Series integrates battery charging, backup control and basic alarm monitoring for security, alarm, access control, emergency lighting and other low-power systems that require continued DC operation during AC mains interruption.

Battery Backup Operation

During normal AC operation, the PSC-35 supplies power to the connected load while charging the external battery. If AC mains power fails, the connected battery continues supplying the load through the built-in backup control circuit.

PSC-35A is designed for 12V battery systems, while PSC-35B is intended for 24V battery systems.

AC OK and Battery Low Alarm Signals

Both PSC-35A and PSC-35B provide AC OK and Battery Low alarm outputs for external monitoring.

These outputs use TTL open-collector signals and require an external voltage source. The maximum applied voltage is 50VDC, with a maximum sink current of 30mA.

For Battery Low indication:

• PSC-35A: Battery Low is indicated below 11V
• PSC-35B: Battery Low is indicated below 22V

Battery Cut-Off Protection

To help prevent excessive battery discharge during extended backup operation, the PSC-35 Series includes battery cut-off protection.

• PSC-35A: 10 ±0.5V battery cut-off
• PSC-35B: 20 ±1V battery cut-off

The series also includes battery reverse-polarity protection by fuse.

Need wiring and connector details? Continue below to review the PSC-35 mechanical drawing, connector assignment and installation information.

Mechanical Dimensions and Installation

The MEAN WELL PSC-35 Series is available as a compact PCB type or as an enclosed type with L-bracket and cover, providing flexible integration into security panels, alarm equipment, access control systems and other battery-backed DC power applications.

Dimensions

The PCB version measures 84.6 × 50.8 × 24 mm (L × W × H), while the enclosed version measures 86.4 × 59.6 × 30 mm (L × W × H).

Both PSC-35A and PSC-35B use the same mechanical platform, allowing a common enclosure or mounting design for 12V and 24V system configurations.

Connector Assignment

The PSC-35 Series uses CN1 for AC input and CN2 for DC output, battery connection and alarm signals.

• CN1: AC/N, No Pin and AC/L
• CN2: Battery Low, AC OK, Battery -, Battery +, +V and -V

The datasheet specifies JST connectors or equivalent. During system integration, note that -V and Battery – must not be shorted together.

Cooling and Operating Environment

The PSC-35 Series uses free-air convection cooling without a built-in fan and operates from -30°C to +70°C, subject to the datasheet derating curve.

Adequate airflow and appropriate safety clearance should be maintained when the power supply is installed inside an enclosure.

Mechanical Drawing and Installation Reference

The PSC-35 mechanical drawing shows the PCB dimensions, mounting-hole positions, connector locations and the assembly arrangement for the optional L-bracket and cover.

For final enclosure design and wiring, refer to the official PSC-35 Series datasheet to confirm mounting dimensions, connector specifications, grounding requirements and installation safety clearances.

Need complete installation details? Review the PSC-35 Series mechanical drawing and datasheet for wiring, connector and mounting information.

Applications

The MEAN WELL PSC-35 Series is designed for compact security and backup power applications requiring regulated DC output, battery charging and automatic battery-supported operation during AC mains interruption.

With PSC-35A for 12V battery systems and PSC-35B for 24V battery systems, the series provides a practical power and backup solution for low-power security, alarm and monitoring equipment.

• Security systems requiring regulated DC power with battery charging and backup capability
• Access control systems requiring continuous DC power during temporary AC mains failure
• Alarm systems using AC OK and Battery Low signals for basic power status monitoring
• Emergency lighting systems requiring battery-supported DC power during AC interruption
• UPS and DC backup systems using an external battery to maintain the connected load when AC input fails
• Central monitoring systems requiring compact AC/DC power, battery backup and alarm status signals

Need safety and compliance details for your project? Continue below to review protection functions, safety approvals, EMC compliance and operating environment specifications for the PSC-35 Series.

Certifications and Safety

The MEAN WELL PSC-35 Series is designed for security, alarm, emergency lighting, access control, UPS and central monitoring applications requiring a compact AC/DC power supply with battery charging and backup capability.

According to the official PSC-35 datasheet, the series carries safety approvals including UL62368-1, TUV BS EN/EN62368-1 and EAC TP TC 004.

Safety and EMC Compliance

The PSC-35 Series is specified to comply with:

• UL62368-1 safety requirements
• BS EN/EN62368-1 safety requirements
• EAC TP TC 004 safety requirements
• BS EN/EN55032 (CISPR32) Class B EMC emission requirements
• BS EN/EN61000-3-2 and EN61000-3-3 harmonic current and voltage fluctuation requirements
• BS EN/EN55035 and applicable EN61000-4-x immunity requirements

Isolation and Electrical Safety

The datasheet specifies the following withstand voltage levels:

• 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 under the datasheet test conditions.

Protection Functions

Built-in protection functions include overload, overvoltage, battery cut-off and battery reverse-polarity protection.

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 to recover.

Operating Environment and Final Equipment Integration

The PSC-35 Series operates from -30°C to +70°C with derating according to the datasheet and uses free-air convection cooling.

The power supply is intended as a component for integration into final equipment. System designers should verify grounding, wiring, enclosure design, thermal conditions and EMC performance in the completed system.

Need more product details before sending an inquiry? Continue below to review model comparison, battery backup operation, alarm signals, mechanical dimensions, installation guidance and application information for the PSC-35 Series.