Mercury 13.8V 43.5A 600W Switch Mode PSU - 3 Channel

The Mercury is a 600W switch mode PSU delivering a stable 13.8V DC output at up to 43.5A, distributed across three separate output channels. The unit regulates voltage to match the nominal output of a fully charged 12V lead-acid battery, making it a direct replacement for battery-powered systems or a charging supply for installations where battery backup is needed.

Designed for radio communications equipment, security systems, access control panels, alarm installations and 12V DC LED lighting arrays, the Mercury handles loads up to 600W continuously. The three output channels allow current to be split between multiple connected devices, reducing the load on any single terminal and simplifying wiring in installations where several systems share the same PSU. Screw terminals on the rear accept cable gauges suitable for the 43.5A maximum draw, and the unit includes short-circuit and overload protection with auto-reset function.

The metal enclosure is ventilated on both sides, with an internal fan that activates under load to maintain operating temperature within the -10°C to +40°C range. The IP20 rating means the unit is intended for indoor use in dry, controlled environments — it is not suitable for outdoor or damp locations. At 240 x 125 x 65mm and 1.15kg, the PSU mounts onto a wall or inside an equipment rack using the corner mounting holes visible in the chassis.

The voltage range is adjustable between 12.42V and 15.18V using a trim potentiometer, allowing fine-tuning to match the exact requirements of connected equipment or to compensate for cable voltage drop over long runs. The unit draws 6A from a 240V AC 50Hz mains supply and includes overcurrent and thermal protection to prevent damage under fault conditions.

Product Manual

What's the difference between the three output channels?

The three channels are electrically identical and all share the same 13.8V output and the combined 43.5A maximum current rating. They exist to allow multiple devices to be connected without paralleling wires onto a single terminal, making installation cleaner and reducing the risk of loose connections under high current draw.

Can this be used to charge 12V lead-acid batteries?

Yes. The 13.8V output is the standard float voltage for sealed lead-acid batteries and can maintain charge on a battery bank while simultaneously powering connected equipment. For bulk charging from a deeply discharged state, a dedicated battery charger with multi-stage charging is preferable.

Is the voltage adjustable?

Yes. A trim potentiometer allows the output to be adjusted between 12.42V and 15.18V. This is useful for compensating for voltage drop over long cable runs or matching the exact voltage requirements of sensitive equipment.

What protection does it have against overload?

The PSU includes short-circuit protection, overload protection and thermal protection. If any of these conditions are detected, the unit shuts down and attempts to auto-reset once the fault is cleared. Persistent faults will keep the unit in shutdown until the cause is removed.