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Mean Well LAD-120A Security/Fire Alarm PSU with Battery Charger/UPS, 120W, 13.8V 7.7A

Name: Mean Well LAD-120A Security/Fire Alarm PSU with Battery Charger/UPS, 120W, 13.8V 7.7A
Brand: Mean Well
SKU: LAD-120A
Price: 38.73 USD
Availability: InStock

built-in battery charger and UPS functionTTL signals for status detectionforced UPS mode for battery maintenance1U low profile

SKU LAD-120A

$38.73 USD

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Select model — 2 in this family

LAD-120A

LAD-120A 120W 13.8V Backorder$38.73 USD

LAD-240A 240W 13.8V Backorder$44.98 USD

Product variants

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Overview

LAD-120A is the CH1: 13.8V / CH2: 13.8V output model of this series: rated current CH1: 7.7A / CH2: 1A(Battery Charger), rated power 120W, typical efficiency 86%.

LAD-120 series is a 120W economical AC/DC low profile security power supply with UPS function. Adopting the input range from 90Vac to 264Vac 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-120 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

LAD-120ASpecifications from the official datasheet (2024-10-30 edition)

OUTPUT

OUTPUT NUMBER: CH1 / CH2
DC VOLTAGE: CH1: 13.8V / CH2: 13.8V
RATED CURRENT: CH1: 7.7A / CH2: 1A(Battery Charger)
CURRENT RANGE: CH1: 0 ~ 8.7A / CH2: --------
RATED POWER: 120W
RIPPLE & NOISE (max.)^Note.2: CH1: 120mVp-p / CH2: --------
VOLTAGE ADJ. RANGE: CH1: 10.8 ~ 14.5V
VOLTAGE TOLERANCE^Note.3: CH1: ±1.0% / CH2: --------
LINE REGULATION: CH1: ±0.5% / CH2: --------
LOAD REGULATION: CH1: ±0.5% / CH2: --------
SETUP, RISE TIME: 500ms, 40ms/230VAC 500ms, 40ms/115VAC at full load
HOLD UP TIME (Typ.): 40ms/230VAC 9ms/115VAC at full load
BATTERY STATIC DISCHARGE CURRENT: <100μA

INPUT

VOLTAGE RANGE: 90 ~ 264VAC 127 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
EFFICIENCY (Typ.): 86%
AC CURRENT (Typ.): 2.5A/115VAC 1.5A/230VAC
INRUSH CURRENT (Typ.): COLD START 30A/115VAC 55A/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%~160%, when total output of CH1 + CH2 reach around 125%~135% output hiccup(120D shuts down) CH1 OLP, CH2 without battery:Hiccup mode o/p voltage, recovers automatically after fault condition is removed (120D shuts down,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: CH1:15.5 ~ 18V 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: 9.5V±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^{Note 4}: 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
Harmonic Current (Note 5) BS EN/EN61000-3-2 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

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
Harmonic Current (Note 5)	BS EN/EN61000-3-2	Class A

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: 1509.9K hrs min. Telcordia SR-332 (Bellcore); 209.4K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 159*97*30mm (L*W*H)
PACKING: 0.42Kg; 30pcs/13.6Kg/0.77CUFT

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. 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. Test harmonic current at 85% load.
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

LAD-120A Suggested Application — Suggested Application

LAD-120A Illustration (page 5) — Illustration (page 5)

LAD-120A Dimensions (mm) — Dimensions (mm)

LAD-120A Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Datasheet1

LAD-120A datasheetLAD-120-SPEC.PDF · 2024-10-30 edition PDF Download

FAQ

What is the Mean Well LAD-120A designed for?

The LAD-120A is a 120W security and fire alarm power supply with a built-in battery charger and UPS function. It is intended for systems that need a regulated 13.8VDC output plus battery-backed continuity during AC power loss.

What output does the LAD-120A provide?

This model provides a 13.8VDC nominal output and is rated for 120W total power. Its rated current is 7.7A, making it suitable for security and fire-related DC power applications that require this voltage class.

Does the LAD-120A support battery backup operation?

Yes. The LAD-120A includes a built-in battery charger (1A on CH2) and UPS function, so it is designed to support backup battery operation. When the AC input is abnormal, the UPS function switches the load to the battery.

What status monitoring features are available on the LAD-120A?

This model provides TTL status signals for AC OK, battery disconnect, battery reverse polarity, battery low, battery full, and discharge. These signals can help system-level monitoring and fault detection in security or fire alarm applications.

What protection features does the LAD-120A include?

The LAD-120A includes protection for overload, over voltage, and over temperature. It also includes a battery cutoff at 9.5V±0.5V and battery reverse polarity protection with no damage stated in the product data.

Can the LAD-120A be used in demanding temperature conditions?

Yes. The specified operating temperature range is -20°C to +60°C, with load derating at higher temperatures per the derating curve, which supports use in a wide range of indoor equipment environments. Buyers should still confirm that the surrounding enclosure and overall system stay within the product's rated conditions.

How compact is the Mean Well LAD-120A?

The LAD-120A uses a low-profile design with a height of 30mm. Its listed dimensions are 159 x 97 x 30mm, and the unit weight is 0.42kg, which helps when space is limited inside security or fire system enclosures.

What certifications or standards are listed for the LAD-120A?

The product data lists safety approvals including UL62368-1, BS EN/EN62368-1, AS/NZS62368.1, and EAC TP TC 004. It also lists EMC compliance to EN55032 Class A and several EN61000 immunity standards, with design reference to GB 17945-2010.

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