PULSAR PSB-48V3A Buffer Power Supply for Embedded Systems, 48 V DC, 3 A, Battery Backup, DIN Rail

Unlike a standard AC adapter, the PULSAR PSB-48V3A is a true buffer power supply: it delivers a regulated 48 V DC output while simultaneously charging a sealed lead-acid battery, guaranteeing uninterrupted operation of access control, alarm, CCTV, or industrial automation systems during mains failure. Its relay outputs and clear LED indicators give installers immediate status feedback, while the rugged metal enclosure supports both DIN rail and screw mounting for flexible integration.

Highlights

• Wide AC input range 176–264 V, 50/60 Hz, suitable for most European mains networks
• 48 V DC output with total current up to 3 A (load + battery charging)
• Dedicated 0.5 A battery charging circuit for 48 V SLA/gel batteries (7–65 Ah)
• Comprehensive protection: SCP, OLP, OVP, UVP, deep discharge, reverse polarity
• Four technical relay outputs: AC failure (EPS), DC output (PSU), low battery (LoB), battery disconnected (LoC)
• LED indicators for AC, DC, and battery status
• Passive cooling for silent, maintenance-free operation
• CE compliant, metal housing, DIN rail or screw mount

In daily use

The PSB-48V3A excels in embedded applications where downtime is not an option. Connect a 48 V battery bank (four 12 V batteries in series) and the unit will automatically switch to battery power when the mains drops, then recharge the battery once power returns. The relay outputs can be wired to a central monitoring panel to alert staff about power anomalies, while the front-panel LEDs allow quick visual checks during routine maintenance.

Full specifications

• Input voltage: 176–264 V AC, 50/60 Hz
• Output voltage: 48 V DC
• Total output current: 3 A (load + battery charging)
• Battery charging current: 0.5 A max
• Recommended battery: 48 V (4× 12 V in series), 7–65 Ah, SLA/gel
• Protections: short circuit, overload, overvoltage, undervoltage, deep discharge, reverse polarity
• Technical outputs: EPS, PSU, LoB, LoC (relay)
• Indicators: LED for AC, DC, battery status
• Mounting: DIN rail or screw mount
• Enclosure: metal
• Cooling: passive
• Operating temperature: -10°C to +40°C
• Compliance: CE

Final note

With its integrated battery management and robust protection, the PSB-48V3A ensures continuous operation of critical systems, making it a reliable choice for professional installers.