Uninterruptible Power Supply ONLINE USV-Systeme YUNTO Smile 400 Line-Interactive 0.4 kVA 240 W 2 AC outlets 12 V 4.5 Ah LCD Tower

ONLINE USV-Systeme YUNTO Smile 400 is a Line-Interactive uninterruptible power supply (UPS) designed for protecting small servers, network devices and workstations. With 0.4 kVA (240 W) output capacity, two AC outlets and an integrated 12 V / 4.5 Ah battery, the Smile 400 provides short-term backup power and automatic voltage regulation to keep connected equipment running during power disturbances. The unit comes in a compact tower form factor with an LCD that shows operational status and basic measurements. Its footprint of 101 × 300 × 142 mm and 3.7 kg weight make it suitable for space-constrained environments where reliable, simple UPS protection is required.

Advantages

The Line-Interactive topology provides automatic voltage regulation and surge protection while delivering uninterrupted power during short outages. The built-in LCD offers clear, at-a-glance information about battery status, load and input/output conditions. Compact tower design and modest weight allow for flexible placement on or under desks and in small racks. Two AC outlets support basic device redundancy without additional power strips, and the integrated 12 V / 4.5 Ah battery delivers a typical backup time of about 7 minutes at half load, sufficient for orderly shutdowns or bridging to a generator.

Suitable for

• Small office servers and NAS devices
• Network switches, routers and VoIP gateways
• Workstations, point-of-sale terminals and small PCs
• Home lab equipment and media devices requiring short-term backup

Key specifications

• Output power capacity: 0.4 kVA
• Output power: 240 W
• AC outlets: 2
• Battery: 12 V / 4.5 Ah (internal)
• Backup time: approximately 7 minutes at 50% load
• Form factor: tower
• Display: LCD status panel
• Dimensions (W×D×H): 101 × 300 × 142 mm
• Weight: 3.7 kg
• Colour: black

How to use

Place the UPS on a stable, flat surface in a ventilated area, leaving clearance for airflow around the enclosure. Connect the UPS input to a grounded mains outlet and switch the unit on using the front panel controls. Plug critical equipment into the two supplied AC outlets. Monitor the LCD for input voltage, load level and battery status. In the event of mains failure, the UPS will automatically supply battery power to connected devices; use the provided runtime to save work and perform an orderly shutdown or transfer to a secondary power source.

Recommendations

For reliable operation, perform an initial battery charge cycle for at least 8–12 hours after first installation. Periodically test the UPS by simulating a power failure and verify that connected devices remain powered and shut down properly. Replace the internal battery according to the manufacturer's recommended interval or when runtime drops significantly. Avoid placing the UPS in direct sunlight or close to heat sources, and ensure load does not exceed the rated 240 W output.