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Mean Well LAD-120D Security/Fire Alarm PSU with Battery Charger/UPS, 120W, 55.2V 1.21A

Name: Mean Well LAD-120D Security/Fire Alarm PSU with Battery Charger/UPS, 120W, 55.2V 1.21A
Brand: Mean Well
SKU: LAD-120D
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-120D

$38.73 USD

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Select model — 6 in this family

LAD-120D

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Product variants

Available to order

Overview

LAD-120D is the CH1: 55.2V / CH2: 55.2V output model of this series: rated current CH1: 1.21A / CH2: 1A(Battery Charger), rated power 121.99W, typical efficiency 88%.

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

OUTPUT

OUTPUT NUMBER: CH1 / CH2
DC VOLTAGE: CH1: 55.2V / CH2: 55.2V
RATED CURRENT: CH1: 1.21A / CH2: 1A(Battery Charger)
CURRENT RANGE: CH1: 0 ~ 2.21A / CH2: --------
RATED POWER: 121.99W
RIPPLE & NOISE (max.)^Note.2: CH1: 360mVp-p / CH2: --------
VOLTAGE ADJ. RANGE: Ch1: 43.5 ~ 58V
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.): 88%
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: CH1:61 ~ 71V 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^{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-120D Suggested Application — Suggested Application

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

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

LAD-120D Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Datasheet1

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

FAQ

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

The LAD-120D is a 120W security and fire alarm power supply with a built-in battery charger and UPS function. It is intended for applications that need regulated 55.2V output plus backup power support and status monitoring features.

What are the main electrical ratings of the LAD-120D?

This model is rated for 121.99W output with a nominal output voltage of 55.2V and rated current of 1.21A. Its AC input range is 90 to 264VAC, and it also supports 127 to 370VDC input.

Does the LAD-120D support battery backup operation?

Yes. The LAD-120D includes a built-in battery charger and UPS function, and UPS mode can also be force-started by shorting pins 7 and 8 of CN2. The charger output is rated at 1A on CH2.

What status signals are available on the LAD-120D?

This power supply provides TTL status signals for AC OK, battery disconnect, battery reverse polarity, battery low, battery full, and discharge. These signals make it suitable for systems that need power and battery condition monitoring.

What protection features does the LAD-120D include?

The LAD-120D includes protection for overload, over voltage, over temperature, battery low voltage (cutoff at 43V±0.5V), and battery reverse polarity. The battery reverse polarity protection is specified as no-damage protection.

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

Yes. This model is rated for operation from -20°C to +60°C, with load derating per the derating curve, which suits a wide range of indoor equipment environments. Buyers should still confirm that the final enclosure and system conditions stay within the product's specified operating range.

How compact is the Mean Well LAD-120D?

The LAD-120D uses a low-profile design with dimensions of 159 x 97 x 30 mm. It weighs 0.42 kg, which helps when space and panel density matter in security or fire system builds.

What certifications and compliance standards does the LAD-120D meet?

The LAD-120D is approved to UL62368-1, BS EN/EN62368-1, AS/NZS62368.1, and EAC TP TC 004. Its design also refers to GB 17945-2010, and listed EMC standards include EN55032 Class A and EN61000-4 series requirements.

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