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Mercury 13.8V 5.4A 74W Switch Mode PSU

£1299
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Mercury is a 13.8V 5.4A switch mode power supply delivering up to 74W of continuous DC output via screw terminals on the rear panel. The 13.8V output voltage matches the fully charged state of a 12V lead-acid battery, allowing the PSU to power 12V devices directly or to maintain a 12V battery system under constant charge without over-voltage damage.

Designed for radio communications, alarm and security systems, access control installations, LED signage and monitoring equipment, the PSU provides a single output channel suitable for powering devices drawing up to 5.4A. Built-in short-circuit protection cuts the output if a fault is detected, while overload protection prevents damage from excessive current draw. Both protections reset automatically once the fault condition is cleared, avoiding manual intervention in most cases.

The compact 110 x 80 x 35mm enclosure with perforated steel casing allows convection cooling and weighs 220g, making it suitable for confined equipment racks, control panels and wall-mounted installations where space is limited. The IP20 rating makes it suitable for indoor use only. Mains input is via a standard 240V AC 50Hz connection rated at 1.3A, and the voltage regulation holds output within 12.42V to 15.18V under varying load conditions.

Installation uses screw terminals for both mains input and DC output, compatible with standard single-core or stranded wire up to 2.5mm². The working temperature range of -10°C to +40°C covers most indoor environments including unheated equipment rooms and loft spaces, though ventilation around the unit should be maintained to prevent thermal stress under sustained maximum load.

Specification
Output voltage 13.8Vdc
IP rating IP20
Voltage range 12.42V-15.18V
Working temperature -10~40°
Power supply 240Vac/1.3A, 50Hz
Power : max. 74.52W
Output current 5.4A
Dimensions 110x35x80mm
Weight 0.22kg
Output channels 1
Downloads

Product Manual

Frequently Asked

Why is the output 13.8V instead of 12V?

The 13.8V output matches the fully charged voltage of a 12V lead-acid battery, allowing the PSU to maintain a battery system under float charge without over-voltage damage. 12V devices are designed to tolerate this voltage range and will operate normally on 13.8V.

Can it power devices rated at exactly 12V?

Yes. Most 12V devices including radios, access control panels, LED drivers and monitoring equipment are specified to operate across a range of 10.8V to 15V, so the 13.8V output is well within tolerance.

What happens if the load exceeds 5.4A?

The overload protection cuts the output to prevent damage to the PSU. Once the excessive load is removed the PSU resets automatically and resumes normal operation.

Is it suitable for outdoor use?

No. The IP20 rating means the PSU has no protection against moisture ingress and is suitable for indoor installations only. For outdoor applications a weatherproof enclosure would be required.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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Designed to fit standard UK back boxes for a straightforward swap of your existing fittings.

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    Description

    The Mercury is a 13.8V 5.4A switch mode power supply delivering up to 74W of continuous DC output via screw terminals on the rear panel. The 13.8V output voltage matches the fully charged state of a 12V lead-acid battery, allowing the PSU to power 12V devices directly or to maintain a 12V battery system under constant charge without over-voltage damage.

    Designed for radio communications, alarm and security systems, access control installations, LED signage and monitoring equipment, the PSU provides a single output channel suitable for powering devices drawing up to 5.4A. Built-in short-circuit protection cuts the output if a fault is detected, while overload protection prevents damage from excessive current draw. Both protections reset automatically once the fault condition is cleared, avoiding manual intervention in most cases.

    The compact 110 x 80 x 35mm enclosure with perforated steel casing allows convection cooling and weighs 220g, making it suitable for confined equipment racks, control panels and wall-mounted installations where space is limited. The IP20 rating makes it suitable for indoor use only. Mains input is via a standard 240V AC 50Hz connection rated at 1.3A, and the voltage regulation holds output within 12.42V to 15.18V under varying load conditions.

    Installation uses screw terminals for both mains input and DC output, compatible with standard single-core or stranded wire up to 2.5mm². The working temperature range of -10°C to +40°C covers most indoor environments including unheated equipment rooms and loft spaces, though ventilation around the unit should be maintained to prevent thermal stress under sustained maximum load.

    Specification
    Output voltage 13.8Vdc
    IP rating IP20
    Voltage range 12.42V-15.18V
    Working temperature -10~40°
    Power supply 240Vac/1.3A, 50Hz
    Power : max. 74.52W
    Output current 5.4A
    Dimensions 110x35x80mm
    Weight 0.22kg
    Output channels 1
    Downloads

    Product Manual

    Frequently Asked

    Why is the output 13.8V instead of 12V?

    The 13.8V output matches the fully charged voltage of a 12V lead-acid battery, allowing the PSU to maintain a battery system under float charge without over-voltage damage. 12V devices are designed to tolerate this voltage range and will operate normally on 13.8V.

    Can it power devices rated at exactly 12V?

    Yes. Most 12V devices including radios, access control panels, LED drivers and monitoring equipment are specified to operate across a range of 10.8V to 15V, so the 13.8V output is well within tolerance.

    What happens if the load exceeds 5.4A?

    The overload protection cuts the output to prevent damage to the PSU. Once the excessive load is removed the PSU resets automatically and resumes normal operation.

    Is it suitable for outdoor use?

    No. The IP20 rating means the PSU has no protection against moisture ingress and is suitable for indoor installations only. For outdoor applications a weatherproof enclosure would be required.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.