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Mean Well DRS-240-12 All-In-One Intelligent Security Power 240W 15.4A

all-in-one function with power supplyDC-UPSbattery charger and status monitoring in one compact unitcharging curve can be set with SBP-001

SKU DRS-240-12

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Overview

DRS-240-12 is the 12V output model of this series: typical efficiency 90%.

DRS-240 is a 240W AC/DC DIN rail type security power supply series. In addition to the primary output, there is an additional charger circuit that will automatically adjust charge current depending on the primary output current. DRS-240 accepts the universal input between 90VAC and 305VAC, and supports output 12VDC, 24VDC, 36VDC, and 48VDC nominal systems. With high efficiency up to 92%, it can operate with free air convection cooling under -30℃ through 70℃ambient temperature. In addition to the key protection features such as overload protection, over voltage protection, battery low voltage disconnect, and battery reverse polarity protection, the DRS-240 also provides Form-C contacts and LED indicator alarm signals for AC-fail, battery low, charger circuit fail, and DC-OK to allow easy integration into security systems that comply with local alarm codes.

Features

Universal input 90~305VAC (277VAC available)
All-in-one function with Power supply, DC-UPS, battery charger and status monitoring in ONE compact unit
Signal and alarms design meet UL2524,NFPA 1221,BS EN/EN54-4 and GB17945 requirement, with adjustable parameters configurable by communication interface
Form C relay contacts and LED indicators for AC Fail, Battery Low, Charger Fail, and DC-OK
Load-dependent high speed battery charging
Built-in MODBus or CANBus protocol
Protections: Short circuit / Overload / Over voltage / Over temperature(auto derating) / Battery reverse polarity (No damage) / Battery cut off
Battery low protection / Battery reverse polarity protection
-30 ~ +70℃ wide operating temperature
Cooling by free air convection
Can be installed on DIN rail TS-35/7.5 or 15
Charging curve can be set with SBP-001(only for CANBus model) (Smart programmer sold separately, please refer to: https://www.meanwell.com/webapp/product/search.aspx?prod=SBP-001)
20~100% charging current adjustable by VR
2 or 3-stage selectable by DIP S.W
Suitable for lead acid and lithium-ion batteries
3 years warranty

Specifications

DRS-240-12Specifications from the official datasheet (2026-09-09 edition)

OUTPUT

OUTPUT VOLTAGE^Note.2: 12V
CURRENT RANGE: 0 ~ 20A
BATTERY CURRENT (CC)(max.): 15.4A
RECOMMENDED BATTERY CAPACITY(AMP HOURS)^Note.3: 20 ~ 200AH
TOTAL OUTPUT POWER^Note.4: Combined power on all Channels must not exceed 240W, load has priority. 275W peak capability within 5s.
RIPPLE & NOISE (max.)^Note.5: 150mVp-p
VOLTAGE TOLERANCE^Note.6: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME^Note.7: 2400ms, 1000ms/230VAC 2400ms, 1000ms/115VAC at full load
HOLD UP TIME (Typ.): 16ms/230VAC 10ms/115VAC at full load

INPUT

VOLTAGE RANGE: 90 ~ 305VAC 127 ~ 431VDC
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR (Typ.): PF>0.95/230VAC PF>0.98/115VAC at full load
EFFICIENCY (Typ.): 90%
AC CURRENT (Typ.): 2.8A/115VAC 1.4A/230VAC
INRUSH CURRENT (Typ.): COLD START 30A/115VAC 60A/230VAC

PROTECTION

SHORT CIRCUIT: Protection type: Constant current limiting, power will shutdown after 5 sec, re-power on to recover.
OVERLOAD: 105 ~ 135% rated output power Protection type: Constant current limiting, shutdown output voltage after 5 sec.
OVER TEMPERATURE: Automatically drop load with temperature only for bat. load. Protection type : Shut down o/p voltage, recover automatically after temperature goes down.
OVER VOLTAGE: Load main output : 16.2 ~ 18.6V Protection type : Shut down o/p voltage, re-power on to recover
BATTERY CUT OFF: 10.5±0.3V
REVERSE POLARITY: By internal MOSFET, no damage, recovers automatically after fault condition is removed.

FUNCTION

FORM-C RELAY AC FAIL: Signals AC failure and activates when input voltage drops below : 79~89VAC of 120AC, 132~187VAC of 220VAC. Relay contact output, ON : AC OK ; OFF : AC Fail ; max. rating : 30Vdc/1A
FORM-C RELAY CHARGER FAIL: Relay contact output, ON : Charger OK ; OFF : Charger Fail ; max. rating : 30Vdc/1A
FORM-C RELAY DC OK: Signals normal DC output and activates when output voltage > 90% rated value. Relay contact output, ON : DC OK ; OFF : DC Fail ; max. rating : 30Vdc/1A
FORM-C RELAY BATTERY LOW/ ABNORMAL/ DISCONNECTED: Relay contact output, ON : Battery OK ; OFF : Battery Low ; max. rating : 30Vdc/1A
BATTERY LOW/ ABNORMAL/ DISCONNECTED: Battery low voltage:< 11±0.2V
BATTERY START: Restart system directly from battery and does not require AC power
DC-UPS: UPS switch to battery power within 10ms of AC failure
ADJUSTABLE CHARGING CURRENT: 20% ~ 100% charging current adjustable by VR
BATTERY TEMPERATURE COMPENSATION: The system can change the battery charging voltage by detecting the temperature (Please refer to page 9~10 for more details).

ENVIRONMENT

WORKING TEMP.: -30 ~ +70℃(Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃) on Load output
VIBRATION: 10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes
OPERATING ALTITUDE^Note.8: 2000 meters / OVC Ⅲ
OVER VOLTAGE CATEGORY: Ⅲ; According to Dekra BS EN/EN62368-1; altitude up to 2000 meters

SAFETY & EMC

SAFETY STANDARDS: UL62368-1, Dekra BS EN/EN62368-1, RCM AS/NZS 62368.1, EAC TP TC 004 approved
WITHSTAND VOLTAGE: I/P-O/P: 4KVAC I/P-FG: 2KVAC O/P-FG: 1.5KVAC
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG: 100M Ohms/500VDC/25℃/ 70%RH
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032 (CISPR32) Class B
Radiated BS EN/EN55032 (CISPR32) Class B
Harmonic Current BS EN/EN61000-3-2
Voltage Flicker BS EN/EN61000-3-2
EMC IMMUNITY: BS EN/EN55035 , BS EN/EN61204-3, BS EN/EN61000-6-2(BS EN/EN50082-2)

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 2, 4KV contact; criteria A
Radiated BS EN/EN61000-4-3 Level 3, 10V/m; criteria A
EFT / Burst BS EN/EN61000-4-4 Level 3, 2KV; criteria A
Surge BS EN/EN61000-4-5 Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-Chassis ;criteria A
Conducted BS EN/EN61000-4-6 Level 3, 10V; criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m; criteria A
FIRE DETECTION AND FIRE ALARM SYSTEM: Compliance to BS EN/EN54-4

Parameter	Standard	Test Level
Conducted	BS EN/EN55032 (CISPR32)	Class B
Radiated	BS EN/EN55032 (CISPR32)	Class B
Harmonic Current	BS EN/EN61000-3-2
Voltage Flicker	BS EN/EN61000-3-2

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 2, 4KV contact; criteria A
Radiated	BS EN/EN61000-4-3	Level 3, 10V/m; criteria A
EFT / Burst	BS EN/EN61000-4-4	Level 3, 2KV; criteria A
Surge	BS EN/EN61000-4-5	Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-Chassis ;criteria A
Conducted	BS EN/EN61000-4-6	Level 3, 10V; criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A/m; criteria A

OTHERS

MTBF: 564.7K hrs min. Telcordia SR-332 (Bellcore); 73.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 85.5*125.2*129.2mm (W*H*D)
PACKING: 1.19Kg; 8pcs/ 12.5Kg / 1.08CUFT

Test conditions and notes10

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. Variable with charger voltage when battery is connected.
3. This is Mean Well's suggested range. Please consult your battery manufacturer for their suggestions about maximum charging current limitation.
4. If load current increases, the system will prioritize load current demand and automatically reduce the battery charging current.
5. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
6. Tolerance : includes set up tolerance, line regulation and load regulation.
7. Length of set up time is measured at cold first start. Turning ON/OFF the power supply may lead to increase of the set up time.
8. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
9. Installation clearances : 40mm on top, 20mm on the bottom, 5mm on the left and right side are recommended when loaded permanently with full power. In case the adjacent device is a heat source, 15cm clearance is recommended.
10. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 720mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to "EMI testing of component power supplies." (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )

Technical drawings

DRS-240-12 Block Diagram — Block Diagram

DRS-240-12 Function manual — Function manual

DRS-240-12 2.DC-UPS function — 2.DC-UPS function

DRS-240-12 ◎ 2 stage charging curve — ◎ 2 stage charging curve

DRS-240-12 ◎ Suitable for lead-acid batteries (flooded, Gel and… — ◎ Suitable for lead-acid batteries (flooded, Gel and…

DRS-240-12 D R S - 2 4 0 series — D R S - 2 4 0 series

DRS-240-12 2UART_TXPMBUS_C — 2UART_TXPMBUS_C

DRS-240-12 ※ User Interface — ※ User Interface

DRS-240-12 ※ Communication cable for DRS series — ※ Communication cable for DRS series

DRS-240-12 DRS series pin assigment — DRS series pin assigment

DRS-240-12 3.3 Communication interface — 3.3 Communication interface

DRS-240-12 5.4 Accessory List — 5.4 Accessory List

DRS-240-12 Connection Diagram — Connection Diagram

DRS-240-12 Suggested Application — Suggested Application

Typical applications

Public safety battery back-up (Red box)
Security system
Emergency lighting system
Alarm system
Uninterruptible DC-UPS system, battery detection system
Central monitoring system
Industrial automation

Downloads

Datasheet1

DRS-240-12 datasheetDRS_240_spec.pdf · 2026-09-09 edition PDF Download

FAQ

What makes the Mean Well DRS-240-12 different from a standard 12V DIN rail power supply?

The DRS-240-12 combines four functions in one compact unit: a 240W power supply, DC-UPS, battery charger, and status monitoring. That makes it better suited to security and critical-power systems than a basic DIN rail PSU that only provides 12VDC output. It also includes relay contacts and LED indicators for AC fail, battery low, charger fail, and DC-OK status.

What types of systems is the DRS-240-12 typically used for?

This model is designed for intelligent security and backup-power applications where 12VDC must stay available during mains interruptions. It is a practical fit for security control panels, monitored alarm systems, and other DIN rail control cabinets that need integrated charging and DC-UPS capability. It complies with BS EN/EN54-4 for fire detection and fire alarm systems.

Is the DRS-240-12 compatible with backup batteries?

Yes. The DRS-240-12 supports both lead acid and lithium-ion batteries, with selectable 2-stage or 3-stage charging. Charging current is adjustable from 20% to 100%, and on the CANBus version (DRS-240-12CAN) the charging curve can also be programmed with the SBP-001. That gives buyers more flexibility when matching the unit to different standby power requirements.

What are the main electrical specifications of the DRS-240-12?

The DRS-240-12 is rated at 240W total output and provides 12VDC with a 0 to 20A load current range and up to 15.4A battery charging current. It accepts a wide 90 to 305VAC input range, with 127 to 431VDC input also supported. Overload, over-voltage, over-temperature, battery reverse polarity, and battery cut-off protections are built in.

Can the DRS-240-12 be used in demanding industrial or enclosure environments?

It is built for a wide operating temperature range of -30°C to +70°C, with load derating at higher ambient temperatures according to the derating curve. The unit is also rated for vibration performance across the X, Y, and Z axes, which helps in control cabinet and industrial environments. Buyers should still confirm the enclosure design supports the unit's thermal conditions.

Does the DRS-240-12 support monitoring and communications for system status?

Yes. The unit includes built-in MODBus protocol, with CANBus available as an option. It also provides Form C relay contacts and front-panel LED indication for key status conditions including AC fail, battery low, charger fail, and DC-OK. This makes it suitable for systems where remote status visibility or alarm signaling matters.

What compliance and standards support does the DRS-240-12 offer?

The DRS-240-12 is approved to UL62368-1 and RCM AS/NZS 62368.1, and its EMC compliance includes EN55032 Class B plus EN61000-3-2 and EN61000-4 series standards. It also complies with BS EN/EN54-4 for fire detection and fire alarm systems. That standards coverage is a key reason buyers choose it for security-related power systems.

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Model	Power	Voltage	Current	IP Rating
Mean Well DRS-240-24 All-In-One Intelligent Security Power 240W 7.7A	240W	24V	7.7A	IP20	View
Mean Well DRS-240-48 All-In-One Intelligent Security Power 240W 3.85A	240W	48V	3.85A	IP20	View
Mean Well DRS-240-36 All-In-One Intelligent Security Power 240W 5.1A	240W	36V	5.1A	IP20	View

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