Firefighter microphone power supply for Praesensa DSO system 24V DSOS24V-PRA

Power supply for DSO systems – reliable power for safety

The DSOS24V-PRA power supply is a key element of Voice Alarm Systems (VAS), providing uninterrupted power to call stations, such as fire department microphones. The device stabilizes the voltage to 24V DC, guaranteeing correct system operation even in the event of a mains power failure – in which case it automatically switches to battery power. The power supply design takes into account operation in demanding conditions, and its solid metal housing (RAL 3001 - red) ensures durability and resistance to damage.

Functionality and protection

The DSOS24V-PRA power supply is not only a power source, but also an advanced monitoring and protection system. It has a number of protections that protect both the installation itself and the connected devices:

• SCP (Short-Circuit Protection): short-circuit protection.
• OLP (OverLoad Protection): overload protection.
• OVP (Over Voltage Protection): overvoltage protection.
• UVP (Under Voltage Protection): protection against excessive battery discharge.
• Protection against reverse battery connection.

Additionally, built-in technical outputs (EPS, APS, PSU, ALARM) allow for remote monitoring of the power supply and battery status, as well as signaling any failures. Optical LED signaling informs about the status of AC, DC power and any damage.

Specifications and application

The power supply is designed to work with maintenance-free lead-acid 7Ah/12V batteries (AGM or gel). Its electrical parameters have been selected to ensure stable and reliable power supply even in the most demanding applications. Use in VAS systems guarantees communication continuity and a quick response in crisis situations. The device meets the requirements of PN-EN 54-4:2001 + A1:2004 + A2:2007 and PN-EN 12101-10:2007 + AC:2007, which confirms its high quality and safety of use. Surface mounting facilitates installation in various locations.

Additional information:

• Maximum battery circuit resistance: 300 mΩ
• Battery charging current: 0.4A
• Housing dimensions: 550 x 380 x 200 mm (+/- 2)
• Net/gross weight: 9.8 / 10.5 kg
• Warranty: 3 years from date of manufacture