MEAN WELL DRC-100 Series 100W DIN Rail Power Supply with Battery Charger | DRC-100A / DRC-100B

Overview of MEAN WELL DRC-100 Series

The MEAN WELL DRC-100 Series is a 100W AC/DC DIN rail power supply with integrated battery charger and UPS backup function, developed for security systems, access control, alarm systems, emergency lighting, central monitoring systems and other applications that require continuous DC power during AC mains interruption.

Unlike a conventional DIN rail power supply, the DRC-100 Series combines a primary DC output with a dedicated battery charging output. When AC mains power is available, the unit supplies the connected load while charging the battery. If AC input fails, the battery supplies power to the load, providing a practical DC backup architecture for security, monitoring and access control equipment.

The series accepts a universal 90–264VAC input and also supports 127–370VDC input. Two models are available: DRC-100A provides 13.8VDC output with 4.5A rated current for 12V battery systems, while DRC-100B provides 27.6VDC output with 2.25A rated current for 24V battery systems. Both models provide 96.6W rated power and support TS35 DIN rail installation.

For system supervision, the DRC-100 Series includes AC OK and Battery Low alarm signals through relay contact outputs. The relay contacts are rated up to 30V / 1A, allowing connected controllers, alarm panels and monitoring systems to detect AC power failure or low battery conditions.

Built-in protection functions include short circuit, overload, overvoltage, battery low cut-off and battery reverse polarity protection by fuse. The series operates by free-air convection over a wide -30°C to +70°C operating temperature range and can be mounted on TS35/7.5 or TS35/15 DIN rail for installation inside control cabinets, security system enclosures and other industrial equipment.

For OEM, system integration and industrial procurement, the DRC-100 Series provides two main configuration options: MEAN WELL DRC-100A for 12V battery backup systems and MEAN WELL DRC-100B for 24V battery backup systems. The series is particularly suitable where a DIN rail power supply, battery charger and DC UPS backup function are required in a single compact unit.

Features

• 100W DIN rail AC/DC power supply with integrated battery charger and UPS function for applications requiring continuous DC power during AC mains interruption
• 96.6W rated power with universal 90–264VAC input and 127–370VDC input capability
• Available in DRC-100A and DRC-100B models for 12V and 24V battery backup systems
• DRC-100A provides 13.8VDC main output with 4.5A rated current and 2.5A battery charger output
• DRC-100B provides 27.6VDC main output with 2.25A rated current and 1.25A battery charger output
• Adjustable main output voltage: 12–15VDC for DRC-100A and 24–30VDC for DRC-100B
• Automatic battery backup operation allows the connected battery to supply the load when AC mains power fails
• AC OK alarm signal for monitoring AC input status through relay contact output
• Battery Low alarm signal for monitoring low battery conditions through relay contact output
• Relay contact outputs for AC OK and Battery Low signaling support up to 30V / 1A
• Battery low cut-off at 10 ±0.5V for DRC-100A and 20 ±1V for DRC-100B
• Battery low alarm threshold below 11V for DRC-100A and below 22V for DRC-100B
• Built-in protection against short circuit, overload and overvoltage
• Battery reverse polarity protection by fuse for safer battery connection
• Overload protection operates in hiccup mode and automatically recovers after the fault condition is removed
• Overvoltage protection shuts down the output and requires input power cycling to recover
• Fanless design with free-air convection cooling for low-maintenance operation
• Wide operating temperature range from -30°C to +70°C, subject to the datasheet derating curve
• Compact 55 × 90 × 100 mm enclosure for space-efficient control cabinet installation
• Compatible with TS35/7.5 and TS35/15 DIN rail installation
• Efficiency up to 89%, depending on model
• LED indicator for power-on status
• 100% full-load burn-in testing
• Safety approvals include UL62368-1, BS EN/EN62368-1, EAC TP TC 004 and AS/NZS 60950.1
• Meets BS EN/EN54-4 requirements for fire detection and fire alarm systems
• Suitable for security systems, access control systems, alarm systems, emergency lighting, DC UPS systems and central monitoring systems
• 3-year manufacturer warranty

Need help choosing between 12V and 24V battery systems? Compare DRC-100A and DRC-100B below.

Model Selection Guide for DRC-100 Series

The MEAN WELL DRC-100 Series includes two 100W DIN rail power supply models with integrated battery charger and UPS backup function. Engineers, OEM buyers and system integrators can select between DRC-100A and DRC-100B primarily according to the required battery system voltage, load current, battery charging current and backup power architecture.

Both models share the same universal 90–264VAC input, 127–370VDC input capability, TS35 DIN rail mounting, free-air convection cooling, AC OK and Battery Low relay signals, battery low cut-off, battery reverse polarity protection and core output protection functions. The main differences are the DC output voltage, rated current, battery charger current and supported battery system voltage.

DRC-100A for 12V Battery Backup Systems

The MEAN WELL DRC-100A is designed for 12V battery architectures and provides a 13.8VDC main output with 4.5A rated current. Its dedicated battery charger output provides up to 2.5A, making it suitable for security, access control, alarm, emergency power and monitoring systems requiring 12V battery backup.

The main output voltage is adjustable from 12–15VDC. Battery Low signaling is activated when battery voltage falls below 11V, while battery cut-off is specified at 10 ±0.5V to protect the battery from excessive discharge during extended backup operation.

DRC-100A is generally selected when the system uses a 12V battery architecture and the connected load is within its 4.5A main output capability.

DRC-100B for 24V Battery Backup Systems

The MEAN WELL DRC-100B is designed for 24V battery architectures and provides a 27.6VDC main output with 2.25A rated current. Its dedicated battery charger output provides up to 1.25A, supporting 24V security, monitoring, alarm and DC backup systems.

The main output voltage can be adjusted from 24–30VDC. Battery Low signaling is activated when battery voltage falls below 22V, while battery cut-off is specified at 20 ±1V.

DRC-100B is generally selected when the equipment or battery architecture is based on 24VDC and the required load current is within its 2.25A main output capability.

How to Choose Between DRC-100A and DRC-100B

For most applications, model selection starts with the battery system voltage. Choose DRC-100A for 12V battery systems and DRC-100B for 24V battery systems. Then verify the connected load current, battery charging requirement, adjustable output voltage range and required backup operating time.

Both models provide 96.6W rated power, but their output current and charger current differ because of the different output voltage architectures. This makes DRC-100A more suitable for higher-current 12V loads, while DRC-100B is intended for 24V systems requiring lower current at the higher output voltage.

The DRC-100 Series is particularly suitable for applications where a single DIN rail unit must provide regulated DC power, battery charging and automatic battery backup when AC mains power is interrupted.

Alarm Monitoring and Backup System Integration

Both DRC-100 models provide AC OK and Battery Low signals through relay contact outputs, allowing alarm panels, controllers or monitoring equipment to detect AC failure and low battery conditions. The relay contacts support a maximum rating of 30V / 1A.

These monitoring functions make the DRC-100 Series suitable for security systems, access control systems, alarm equipment, emergency lighting, central monitoring systems and other installations where power status and battery condition need to be supervised.

Need help choosing the correct DRC-100 model? Select DRC-100A for 12V battery systems or DRC-100B for 24V battery systems, then confirm the required load current, battery charging current, output adjustment range and backup power requirements for your application.

Related MEAN WELL DRC Series Power Supplies

For battery backup system design and DIN rail power selection, the following MEAN WELL DRC Series power supplies are closely related to the DRC-100 Series and can be compared according to required power level, battery system voltage, charging requirement, load current and installation needs:

• DRC-40 Series – Lower-power DIN rail AC/DC power supply with integrated battery charger and UPS function for compact security, access control, alarm and DC backup applications.
• DRC-60 Series – Mid-range DRC Series solution for security, access control, monitoring and battery backup systems requiring more output capability than DRC-40 while maintaining a compact DIN rail format.
• DRC-180 Series – Higher-capacity DRC Series power supply for larger security, monitoring and battery backup applications requiring increased DC output capability.

Need help selecting the right MEAN WELL DRC Series power supply?
Compare DRC-40, DRC-60, DRC-100 and DRC-180 based on required output power, battery system voltage, load current, battery charging requirement, alarm and monitoring needs, installation space and backup system design.

Battery Backup, AC OK and Battery Low Alarm Functions

The MEAN WELL DRC-100 Series integrates DC power supply, battery charging and backup control in a DIN rail design. It is intended for security systems, access control, alarm systems, emergency lighting, central monitoring systems and other applications that require continued DC power when AC mains power is interrupted.

When AC mains is available, the DRC-100 Series supplies power to the connected load while charging the external battery. If AC input fails, the battery automatically supplies the load through the internal backup control circuit, allowing critical equipment to continue operating without a separate external DC UPS module.

Both DRC-100A and DRC-100B also provide AC OK and Battery Low alarm outputs for integration with controllers, alarm panels and monitoring systems. These alarm functions are provided through relay contact outputs with a maximum rating of 30V / 1A.

Battery Backup Operation

The DRC-100 Series is designed for direct integration with an external battery. During normal AC operation, the power supply provides energy to the load while charging the connected battery at the same time.

When AC mains power is interrupted, the battery automatically begins supplying power to the connected load. This allows the DRC-100 Series to function as a DIN rail power supply with battery backup for systems that must remain operational during temporary AC power failure.

The DRC-100A is intended for 12V battery architectures, while the DRC-100B is intended for 24V battery architectures.

AC OK Alarm Signal

The AC OK signal allows an external monitoring circuit to detect whether the power supply is operating normally from AC mains.

According to the DRC-100 alarm logic, the AC OK relay contact is ON when AC power is normal and OFF when AC input fails. In the suggested application table, the monitored signal is described as Low when the power supply is ON and High or open when the power supply turns OFF.

This signal can be connected to an alarm panel, PLC input, controller or monitoring circuit to provide AC power status feedback.

Battery Low Alarm Signal

The Battery Low signal provides early warning when the connected battery voltage falls below the specified threshold.

For DRC-100A, the Battery Low signal is activated when battery voltage falls below 11V. For DRC-100B, the threshold is below 22V.

The alarm output changes state according to battery condition, allowing security systems, monitoring controllers or alarm equipment to detect low battery voltage before battery cut-off occurs.

Battery Low Cut-Off Protection

To help prevent excessive battery discharge during extended backup operation, the DRC-100 Series includes battery low cut-off protection.

The specified battery cut-off voltage is 10 ±0.5V for DRC-100A and 20 ±1V for DRC-100B.

This function works together with the Battery Low alarm signal to provide both early warning and low-voltage battery protection during backup operation.

Relay Contact Alarm Output

The DRC-100 Series provides AC OK and Battery Low signals through relay contact outputs.

An external voltage source is required for the alarm circuit. The datasheet specifies a maximum applied voltage of 30V and a maximum current of 1A.

This relay-based signaling allows the DRC-100 Series to interface with alarm panels, controllers and monitoring equipment that require external power status and battery condition feedback.

Terminal Assignment and System Connection

The DRC-100 Series provides dedicated terminals for AC input, DC output, battery connection and alarm signaling.

The output-side terminal block includes connections for:

• +V / -V for the main DC load output
• Bat. + / Bat. – for the external backup battery
• AC OK for AC power status monitoring
• Bat. Low for low battery status monitoring

For correct installation, battery wiring and alarm circuit design, engineers should follow the terminal assignment and suggested application diagram provided in the DRC-100 datasheet.

DIN Rail Installation

The DRC-100 Series is designed for installation on TS35/7.5 or TS35/15 DIN rail. Its 55 × 90 × 100 mm enclosure allows integration into security panels, control cabinets, access control enclosures and other space-constrained electrical installations.

The datasheet recommends installation clearances of 40mm above, 20mm below and 5mm on the left and right sides when operating continuously at full power. When an adjacent device is a heat source, a 15mm side clearance is recommended.

Need wiring and installation details for the DRC-100 Series? Review the connection diagram, terminal assignment and mechanical drawing below, or refer to the official DRC-100 datasheet for complete battery wiring, alarm output and DIN rail installation information.

Mechanical Dimensions and Installation

The MEAN WELL DRC-100 Series features a compact DIN rail enclosure measuring 55 × 90 × 100 mm (W × H × D), allowing installation inside security panels, access control cabinets, alarm enclosures, monitoring systems and other DC backup applications where panel space must be used efficiently.

The series is designed for TS35/7.5 or TS35/15 DIN rail mounting and uses free-air convection cooling without a built-in fan. Its mechanical design integrates AC or DC input, main DC output, external battery connection and alarm signaling within a single DIN rail power supply platform.

Dimensions

The overall dimensions of the DRC-100 Series are 55 mm wide, 90 mm high and 100 mm deep, with a specified dimensional tolerance of ±1 mm.

Both DRC-100A and DRC-100B use the same mechanical enclosure, making it easier to standardize cabinet and panel layouts when selecting between 12V and 24V battery backup architectures.

The 55 mm wide enclosure integrates the main power supply, battery charging circuit, backup control and alarm interfaces in a single DIN rail unit.

Terminal Assignment

The DRC-100 Series uses separate terminal blocks for input power and output-side system connections.

TB1 input terminals:

• Pin 1: AC/L or DC+
• Pin 2: AC/N or DC-
• Pin 3: FG

TB2 output, battery and signal terminals:

• Pins 1–2: -V main DC output
• Pins 3–4: +V main DC output
• Pin 5: Bat. +
• Pin 6: Bat. –
• Pins 7–8: AC OK relay contact
• Pins 9–10: Bat. Low relay contact

These terminals provide the required connections for AC or DC input, main DC load output, external backup battery and AC power or battery status monitoring.

DIN Rail Installation

The DRC-100 Series is designed to fit TS35/7.5 or TS35/15 DIN rail. The DIN rail itself is not included with the power supply.

For installation, the unit should be mounted vertically according to the mechanical and installation instructions shown in the official datasheet. Correct mounting orientation helps maintain free-air convection and proper thermal performance.

The DIN rail format makes the DRC-100 Series suitable for control cabinets, security system enclosures, access control panels, alarm equipment and central monitoring systems where integrated battery backup power is required.

Installation Clearance

For continuous full-power operation, the datasheet recommends the following installation clearances:

• 40 mm above the power supply
• 20 mm below the power supply
• 5 mm on the left and right sides

If an adjacent device is a heat source, a side clearance of 15 mm is recommended.

These clearances help maintain sufficient natural airflow around the fanless enclosure and support reliable operation when the DRC-100 Series is loaded continuously at full power.

Cooling and Operating Environment

The DRC-100 Series uses free-air convection cooling and does not require a fan. The specified operating temperature range is -30°C to +70°C, subject to the derating curve in the datasheet.

For operating altitudes above 2000 m, the datasheet specifies an additional ambient temperature derating of 3.5°C per 1000 m for fanless models. System designers should consider load level, ambient temperature, surrounding heat sources, installation clearance and cabinet ventilation when integrating the DRC-100 Series into enclosed equipment.

Mechanical Drawing and Installation Reference

The mechanical drawing shows the 55 × 90 × 100 mm enclosure dimensions, TB1 and TB2 terminal locations, front-panel DC OK indication and output voltage adjustment area, rear DIN rail mounting structure and the recommended TS35 installation method.

For final panel design and wiring, engineers should refer to the official DRC-100 mechanical drawing and installation instructions to confirm terminal assignment, mounting clearance, wiring arrangement and system connection details.

Need application and compliance information for the DRC-100 Series? Continue below to review recommended applications, safety approvals, EMC compliance and battery backup system guidance.

Applications

The MEAN WELL DRC-100 Series is designed for security, access control and backup power applications that require a 100W DIN rail AC/DC power supply with integrated battery charger and UPS function.

With universal 90–264VAC input, 13.8V or 27.6V output options, automatic battery backup operation, AC OK and Battery Low relay signals, battery low cut-off and DIN rail installation, the DRC-100 Series provides a practical DC backup solution for systems that must remain operational during temporary AC mains interruption.

• Security systems requiring regulated DC power, battery charging and automatic backup operation
• Access control systems including controllers, door access panels and related security equipment requiring 12V or 24V battery backup
• Alarm and fire detection systems requiring continuous DC power, battery backup and AC OK / Battery Low status monitoring
• Emergency lighting systems requiring battery-supported DC power during AC mains failure
• DC UPS systems using an external battery for automatic backup power when AC input is interrupted
• Central monitoring systems requiring power status and low-battery signaling for system supervision

Need certification and compliance details for your project? Continue below to review safety approvals, EMC compliance, protection functions and operating environment specifications for the DRC-100 Series.

Certifications and Safety

The MEAN WELL DRC-100 Series is designed for security, access control, alarm, emergency lighting and DC backup applications requiring reliable AC/DC conversion, battery charging and internationally recognized safety and EMC compliance.

According to the official DRC-100 datasheet, the series carries the following safety approvals:

• UL62368-1 for applicable audio/video, information and communication technology equipment safety requirements
• TÜV BS EN/EN62368-1 for European safety compliance
• EAC TP TC 004 for Eurasian safety requirements
• AS/NZS 60950.1 for applicable Australia and New Zealand safety requirements

The DRC-100 Series is also subjected to a 100% full-load burn-in test as part of the manufacturer’s production and reliability control process. The datasheet further states compliance with BS EN/EN54-4 for fire detection and fire alarm systems.

EMC Emission Compliance

For electromagnetic emission requirements, the DRC-100 Series complies with:

• BS EN/EN55032 (CISPR32) Class B
• BS EN/EN61000-3-2
• BS EN/EN61000-3-3
• EAC TP TC 020

These emission standards address conducted and radiated electromagnetic emissions and support integration into equipment that must meet applicable EMC requirements.

EMC Immunity Compliance

The series also complies with EMC immunity requirements including:

• BS EN/EN61000-4-2 electrostatic discharge immunity
• BS EN/EN61000-4-3 radiated RF immunity
• BS EN/EN61000-4-4 electrical fast transient immunity
• BS EN/EN61000-4-5 surge immunity
• BS EN/EN61000-4-6 conducted RF immunity
• BS EN/EN61000-4-8 power-frequency magnetic field immunity
• BS EN/EN61000-4-11 voltage dips and interruption immunity
• BS EN/EN55035
• BS EN/EN61204-3
• EAC TP TC 020

Isolation and Electrical Safety

The DRC-100 Series 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 minimum between input-output, input-FG and output-FG under the datasheet test conditions.

Protection Functions

Built-in protection functions include short circuit, overload and overvoltage protection, together with battery low cut-off and battery reverse polarity protection by fuse.

For overload conditions, the DRC-100 Series uses hiccup-mode protection and automatically recovers after the fault condition is removed. Overvoltage protection shuts down the output and requires the power supply to be re-powered to recover.

Fire Detection and Alarm System Compliance

The official DRC-100 datasheet states that the series meets BS EN/EN54-4 requirements for fire detection and fire alarm systems.

This makes the DRC-100 Series relevant for fire detection, alarm and security power applications where integrated battery charging, backup operation and monitored DC power are required. Final system compliance must still be verified at the equipment level according to the requirements of the completed installation.

Final Equipment Compliance

The DRC-100 Series is supplied as a component power supply intended for installation inside final equipment. The official datasheet states that the completed equipment must be re-confirmed for EMC compliance after system integration.

System designers should therefore verify grounding, enclosure design, wiring layout, installation clearance, thermal conditions and electromagnetic compatibility in the final security, access control, alarm or backup power system.

Need more product details before sending an inquiry? Continue below to review model comparison, battery backup operation, alarm signaling, mechanical dimensions, installation guidance and application information for the DRC-100 Series.