Power Supplies
Power supplies for fire alarm, security, access control, CCTV and door entry systems. Choose EN 54-4 fire alarm PSUs, 12V and 24V boxed PSUs with battery backup, door retainer supplies and replacement panel PSUs.
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About Power Supplies
Power supplies for fire alarm, security, access control, CCTV and door entry systems. Choose EN 54-4 fire alarm PSUs, 12V and 24V boxed PSUs with battery backup, door retainer supplies and replacement panel PSUs.
Power supplies we stock
- EN 54-4 fire alarm power supplies – 24V PSUs with battery charging, including the C-TEC 5 Series BF562-1 and BF562-3, Kentec 5.25A Syncro-styled PSU, Advanced MXP-549 and MXP-651, Dycon D2433-17, HAES 3A PSU, Eaton SPS and Honeywell HLSPS50.
- Door retainer power supplies – 24V units for magnetic fire door holders, such as the Dycon D2401-A and C-TEC BF375P. See also door hardware and retainers.
- Security and access control PSUs – 12V and 24V boxed PSUs with battery backup from CQR, Haydon, Paxton and CDVI, including the CQR 12V 2A EN Grade 3 PSU, Texecom PSU200XP and Haydon 12V 5A PSU for two Paxton Net2 controllers.
- CCTV power supplies – multi-output camera PSUs such as the Haydon 16-channel 10A PSU, plus 12V inline PSUs.
- Door entry power supplies – Comelit-PAC Simplebus2 and DIN rail units and the Videx VX2300.
- Replacement panel PSUs – spares such as the C-TEC CFP702/PSU and Advanced MXS-005 for Mx-4400.
Shop by brand: C-TEC, Kentec, Advanced and HAES.
How to choose a power supply
- Voltage: match the output (12V or 24V DC, or AC for some CCTV and door entry kit) to the equipment.
- Current: add up the maximum load of every device and allow for battery charging current and some spare capacity.
- Standby batteries: check the largest battery the enclosure holds and the charger supports, then choose batteries to give the standby time the system needs.
- Standards: use an EN 54-4 PSU on fire detection and alarm systems, and a PSU of the correct EN grade for intruder alarm systems.
Why buy from JEM Systems UK
JEM Systems UK supplies genuine C-TEC, Kentec, Advanced and Haydon power supplies, all brand new and factory sealed, to trade installers across the UK. You can order PSUs together with batteries and fire alarm panels. Buy online from JEM Systems UK with fast, tracked UK delivery.
Power supply FAQs
What is an EN 54-4 power supply?
EN 54-4 is the European standard for power supply equipment used in fire detection and fire alarm systems. It covers mains and standby battery operation, battery charging and fault monitoring.
Can I use a standard 24V power supply on a fire alarm system?
No. A fire alarm system should be powered by EN 54-4 power supply equipment with a monitored standby battery, not a general-purpose 24V PSU.
12V or 24V – which do I need?
Fire alarm devices and door retainers are usually 24V, while intruder alarm, access control and many CCTV devices are 12V. Always follow the equipment manufacturer's data sheet.
What batteries does a PSU take?
Most boxed PSUs take one or two 12V sealed lead acid batteries. The maximum size, for example 2 x 7Ah or 2 x 17Ah, is given in the product title or data sheet.
Shop by type: 12V batteries. Related brands: RGL Electronics and STP.