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LAD-120B
Manufacturer MEAN WELL

LAD-120B

Availability: Out of stock
120 W27.6 / 27.6 V4.4 / 1 A90V-264V in

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LAD-120B
Quantity Prices (ARS)
Quantity
Unit Price (ARS)
1+
$59.155,33 ARS
10+
$56.197,56 ARS
20+
$55.014,46 ARS
50+
$53.831,35 ARS
100+
$52.648,24 ARS
200+
$51.465,14 ARS
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Quick Specs
Input Voltage
90V-264V
Output Voltage
27.6 / 27.6V
Rated Current
4.4 / 1A
Power Rating
120W
Waterproof
Non-waterproof
Dimensions & Weight
6.26 x 3.82 x 1.18 in

Datasheet (PDF)

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The MEAN WELL LAD-120B is a 120W security/fire alarm power supply with a built-in battery charger and UPS function. CH1 supplies the load at 27.6V (up to 3.4A) while CH2 charges an external 24V battery at 27.6V / 1A. When AC mains fails, the unit switches to UPS mode and the battery takes over the load; a battery cutoff at 21.5V ±0.5V protects the battery from deep discharge.

Key features

  • CH1 load output 27.6V, 3.4A rated (0–4.4A); CH2 battery charger 27.6V, 1A
  • Built-in UPS function: automatic switch to battery on AC failure
  • Battery cutoff 21.5V ±0.5V; battery reverse polarity protection (an external fuse in series with the battery is required)
  • Signal outputs: AC OK, battery low, battery full, battery disconnect/reverse polarity, discharge (TTL)
  • Input: 90–264VAC / 127–370VDC
  • Protections: overload, over voltage, over temperature
  • Typical efficiency 88%

Specifications

Output Voltage Rated current Current range Ripple & noise (max.)
CH1 (load) 27.6V 3.4A 0–4.4A 150mVp-p
CH2 (battery charger) 27.6V 1A — —
Model LAD-120B
Series LAD-120
Total rated power 121.4W
CH1 voltage adjustment 21.6–29V
Battery cutoff 21.5V ±0.5V
Input 90–264VAC / 127–370VDC
Efficiency (typ.) 88%
Working temperature -20 to +60°C (-4 to 140°F) ambient, derating per datasheet curve
Dimensions 159 × 97 × 30 mm (6.26 × 3.82 × 1.18 in) (L × W × H)
Weight 0.42 kg

Typical applications: security and access-control systems, fire alarm panels, emergency and backup-powered equipment.

Datasheet: LAD-120 series specification (PDF).

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Environmental Documents
📄 E6) COC-REACH (2026/01/28) 📄 E9) CMRT (2025/04/25) 📄 E14) COC-ROHS 2 (2015/863/EU) (2024/10/04) 📄 REACH Certificate (PDF) (2020/12/03) 📄 ROHS Certificate (PDF) (2020/05/29) 📄 E12) COC-ROHS 2 (2011/65/EU) (2016/10/01)
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