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Mean Well LAD-240D Security/Fire Alarm PSU with Battery Charger/UPS, 240W, 55.2V 3.4A
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Mean Well LAD-240D Security/Fire Alarm PSU with Battery Charger/UPS...
Overview
LAD-240D is the CH1: 55.2V / CH2: 55.2V output model of this series: rated current CH1: 3.4A / CH2: 1A(Battery Charger), rated power 242.88W, typical efficiency 88%.
LAD-240 series is a 240W economical AC/DC low profile security power supply with UPS function. Adopting the input range from 90Vac to 264Vac (115Vac/230Vac selectable by switch) and supports output 13.8V, 27.6V, 41.5V and 55.2Vdc. With high efficiency up to 88% and built-in AC, battery switch for easy maintenance. In addition, LAD-240 series also provide TTL signals for AC OK, battery disconnect, battery reverse polarity (No damage), battery low detection, battery full and discharge, to allow easy integration into security and fire systems directly.
Features
- Built-in battery charger and UPS function
- TTL signals for status detection: AC OK, Battery disconnect, Battery reverse polarity, Battery low, Battery full and Discharge
- Built-in AC and battery circuit ON/OFF switches enhance safetyness during maintenance
- Forced UPS mode for battery maintenance
- Protections: Short circuit / Overload / Over voltage / Over temperature / Battery low voltage / Battery reverse polarity (No damage)
- -20 ~ +60℃ wide operating temperature
- Output voltage adjustable (-20%~+5%) for CH1 by VR
- Suitable for lead acid and lithium-ion batteries
- Design refer to GB17945 system requirement
- 1U low profile (30 mm)
- 3 years warranty
Specifications
OUTPUT
- OUTPUT NUMBER
- CH1 / CH2
- DC VOLTAGE
- CH1: 55.2V / CH2: 55.2V
- RATED CURRENT
- CH1: 3.4A / CH2: 1A(Battery Charger)
- CURRENT RANGE
- CH1: 0 ~ 4.4A / CH2: --------
- RATED POWER
- 242.88W
- RIPPLE & NOISE (max.)Note.2
- CH1: 240mVp-p / CH2: --------
- VOLTAGE ADJ. RANGE
- CH1: 43.5 ~ 58V
- VOLTAGE TOLERANCENote.3
- CH1: ±0.5% / CH2: --------
- LINE REGULATION
- CH1: ±0.5% / CH2: --------
- LOAD REGULATION
- CH1: ±0.5% / CH2: --------
- SETUP, RISE TIME
- 2000ms, 50ms/230VAC 2000ms, 50ms/115VAC at full load
- HOLD UP TIME (Typ.)
- 16ms/230VAC 12ms/115VAC at full load
- BATTERY STATIC DISCHARGE CURRENT
- <100μA
INPUT
- VOLTAGE RANGE
- 90 ~ 132VAC / 180 ~ 264VAC by switch 240 ~ 370VDC (Default switch at 230VAC)
- FREQUENCY RANGE
- 47 ~ 63Hz
- EFFICIENCY (Typ.)
- 88%
- AC CURRENT (Typ.)
- 4.4A/115VAC 2.4A/230VAC
- INRUSH CURRENT (Typ.)
- COLD START 60A/115VAC 60A/230VAC
- LEAKAGE CURRENT
- <0.5mA / 240VAC
PROTECTION
- OVERLOAD
- CH1:105 ~ 135% CH2:90 ~ 110% Protection type : CH1 OLP, CH2 with battery: The unit will enter to UPS mode when CH1 is around 105%~120%, when total output of CH1 + CH2 reach around 125%~135% output shuts down CH1 OLP, CH2 without battery:Shut down o/p voltage,re-power on to removed CH2 : Constant current limiting; fault condition does not affect CH1 working,recovers automatically after fault condition is removed (External fuse is mandatory in series connection with battery for protection)
- OVER VOLTAGE
- CH1:59 ~ 69V Protection type : Shut down o/p voltage, re-power on to removed
- OVER TEMPERATURE
- Protection type : Shut down o/p voltage, re-power on to removed
- BATTERY REVERSE POLARITY
- Protected when reverse polarity , no damage, recovers automatically after fault condition is removed
- BATTERY CUTOFF
- 43V±0.5V
FUNCTION
- AC OK
- TTL signal, High / Open : AC Fail ; Low : AC OK ; Ice : max. 30mA@ 50VDC
- BATTERY DISCONNECT/ REVERSE POLARITY
- TTL signal, High / Open : Battery connect/normal ; Low : Battery disconnect/reverse polarity; Ice : max. 30mA@ 50VDC
- BATTERY LOW
- TTL signal, High / Open : Battery normal ; Low : Battery low; Ice : max. 30mA@ 50VDC
- BATTERY FULL
- TTL signal, High / Open : Battery charging ; Low : Battery full ; Ice : max. 30mA@ 50VDC
- DISCHARGE
- TTL signal, High / Open : Charge ; Low : Discharge ; Ice : max. 30mA@ 50VDC
ENVIRONMENT
- WORKING TEMP.
- -20 ~ +60℃ (Refer to "Derating Curve")
- WORKING HUMIDITY
- 20 ~ 95% RH non-condensing
- STORAGE TEMP., HUMIDITY
- -30 ~ +85℃, 10 ~ 95% RH non-condensing
- TEMP. COEFFICIENT
- ±0.03%/℃ (0 ~ 50℃)
- VIBRATION
- 10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes
SAFETY & EMC
- SAFETY STANDARDS
- UL62368-1, BS EN/EN62368-1, AS/NZS62368.1, EAC TP TC 004 approved; Design refer to GB 17945-2010
- WITHSTAND VOLTAGE
- I/P-O/P:3KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
- 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), EAC TP TC 020 Class A Radiated BS EN/EN55032 (CISPR32), EAC TP TC 020 Class A - EMC IMMUNITY
-
Parameter Standard Test Level ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 2, 6KV 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 ;2KV/Line-FG ;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
- 1394.9K hrs min. Telcordia SR-332 (Bellcore); 156.7K hrs min. MIL-HDBK-217F (25℃)
- DIMENSION
- 215*115*30mm (L*W*H)
- PACKING
- 0.75Kg; 15pcs/12.25Kg/0.7CUFT
Test conditions and notes6
- 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
- 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
- 3. Tolerance : includes set up tolerance, line regulation and load regulation.
- 4. 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 360mm*360mm metal plate with 1mm of thickness. Radiation testing requires adding 13*26*30NIZN magnetic loops or buckles to the battery output wire. 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 )
- 5. This power supply does not meet the harmonic current requirements outlined by BS EN/EN61000-3-2. Please do not use this power supply under the following conditions: a) the end-devices is used within the European Union, and b) the end-devices is connected to public mains supply with 220Vac or greater rated nominal voltage, and c) the power supply is: - installed in end-devices with average or continuous input power greater than 75W, or - belong to part of a lighting system Exception: Power supplies used within the following end-devices do not need to fulfill BS EN/EN61000-3-2 a) professional equipment with a total rated input power greater than 1000W; b) symmetrically controlled heating elements with a rated power less than or equal to 200W
- 6. 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).
Technical drawings
Typical applications
- Fire emergency and evacuation system
- Public safety battery back-up
- Security system
- Uninterruptible DC-UPS system
- Central monitoring system
- Industrial automation
Downloads
Datasheet1
FAQ
What is the Mean Well LAD-240D designed for?
The LAD-240D is a 240W security and fire alarm power supply with a built-in battery charger and UPS function. It is intended for applications that need a regulated 55.2V DC output plus battery-backed power continuity. Its feature set is aimed at professional security, fire, and related control-system use.
Does the LAD-240D support battery backup operation?
Yes. This model includes a built-in battery charger and UPS function, so it can support backup-power applications when used with a suitable battery. It also includes a forced start UPS mode and status signals such as battery low, battery full, discharge, disconnect, and reverse polarity.
What are the main output specifications of the LAD-240D?
This model is rated at 242.88W with a nominal output voltage of 55.2V and rated current of 3.4A, plus a 1A battery charger output. The CH1 output voltage is adjustable within a 43.5V to 58V range. These specifications make it suitable for systems that require a higher-voltage DC power supply with battery charging capability.
What protections are included in the Mean Well LAD-240D?
The LAD-240D includes protection for overload, over voltage (59 ~ 69V), over temperature, battery low voltage (cutoff at 43V±0.5V), and battery reverse polarity with no damage. It also provides TTL status signals for AC OK and several battery conditions. These features help support system monitoring and improve resilience in critical applications.
Can the LAD-240D be used in demanding temperature conditions?
Yes. The specified operating temperature range is -20°C to +60°C, with output derating at higher temperatures per the derating curve. That makes it a good fit for installations where ambient conditions may vary significantly.
What certifications and compliance standards does the LAD-240D meet?
The LAD-240D is approved to UL62368-1, BS EN/EN62368-1, AS/NZS62368.1, and EAC TP TC 004. It also lists EMC compliance to EN55032 Class A and related EN61000 standards, with design reference to GB 17945-2010. These approvals are relevant for buyers evaluating safety and EMC compliance in professional deployments.
How compact is the LAD-240D for panel or enclosure use?
The LAD-240D has a low-profile design with dimensions of 215 x 115 x 30 mm and a weight of 0.75 kg. Its slim 30 mm height can be useful where available enclosure space is limited.
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