Pulsar PSB-12V3A 13.8V/3A Buffer Power Supply Unit, Built-in, 170-260V AC Input, 12-15V DC Adjustable Output, for 12V Lead-Acid Batteries 7-40Ah

The Pulsar PSB-12V3A is a professional-grade impulse buffer power supply unit designed for built-in installation. It provides a stabilised 13.8V DC output (adjustable 12-15V) with a maximum total current of 3A, making it ideal for powering security systems, access control, CCTV cameras, and other low-voltage devices while simultaneously charging a backup 12V lead-acid battery (SLA, AGM, Gel) from 7Ah to 40Ah. The unit features selectable battery charging current (0.5A/1A/2A) and comprehensive protections including short-circuit, overload, overvoltage, battery deep discharge, and reverse polarity. With passive convection cooling and an open-frame design with protective cover, it ensures reliable, maintenance-free operation in indoor environments.

Advantages

Reliable buffer operation ensures uninterrupted power to connected devices even during mains failure. Adjustable output voltage allows fine-tuning for specific equipment requirements. Selectable charging current optimises battery life and charging time. Comprehensive protection circuits safeguard both the power supply and connected devices. Compact built-in design saves space and allows discreet installation.

Suitable for

• Security and alarm systems
• CCTV and video surveillance
• Access control systems
• Fire alarm panels
• Low-voltage automation and control

Key specifications

• Input voltage: 170-260V AC, 50/60Hz
• Output voltage: 13.8V DC nominal (adjustable 12-15V DC)
• Maximum output current: 3A total
• Battery charging current: selectable 0.5A / 1A / 2A
• Battery type: 12V lead-acid (SLA, AGM, Gel), capacity 7-40Ah
• Protections: SCP, OLP, OVP, UVP (battery deep discharge ~9.5V), reverse polarity
• Efficiency: >80%
• Ripple & noise: <100mVp-p
• Indicators: AC power LED, DC output LED, battery status LED
• Mounting: built-in / screw terminal
• Cooling: passive convection
• Enclosure: open frame with protective cover

Recommendations

For optimal battery life, select the charging current according to the battery capacity (typically 0.1C). Ensure adequate ventilation around the unit. Use appropriate gauge wiring for the output current. This unit is intended for indoor use only.