UPS Maintenance Bypass Switches (MBS / EMBS)
Available for single-phase and three-phase UPS systems, with single, dual-input or N+1 configurations to support safe maintenance and system continuity.
A UPS Maintenance Bypass Switch (MBS), also known as an External Maintenance Bypass Switch (EMBS), allows a UPS system to be safely isolated for servicing, repair or replacement while maintaining power to the connected load.
This helps reduce downtime and supports continuity of operation for critical IT, communications and other essential equipment during planned maintenance. Our team can help you select the correct bypass configuration for your UPS system, including single-phase, three-phase, single-input and dual-input options. Contact us on 0333 222 4000 for specification advice and pricing.
With 32 years of experience, our knowledgeable sales team is here to provide expert advice on UPS systems tailored to your needs. We specialise in professional installation and comprehensive maintenance services for systems 5kVA and above.
Legrand Keor Maintenance Bypass Switch 1-3kVA
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Legrand Keor Maintenance Bypass Switch 1-3kVA
Frequently Asked Questions
A UPS maintenance bypass switch is a dedicated electrical switch that safely routes power around a UPS (uninterruptible power supply) during service or maintenance. It allows the UPS to be isolated without interrupting the critical (connected) load.
You need a UPS maintenance bypass switch to carry out repairs, testing or replacement of your UPS without powering down critical equipment. It ensures continuity of power while engineers work on the UPS.
A UPS maintenance bypass switch provides an alternate path for electrical power to flow directly to the load, bypassing the UPS. Engineers bypass the UPS during maintenance, then put it back under load once work is complete.
Installing a UPS maintenance bypass switch can be done at any time if the UPS does not have one. It involves a power down of the critical load for installation, but once installed, the critical load does not need to be powered down again for any services or actions relating to the UPS. It is essential whenever continuous uptime is required, such as in data centres, hospitals, manufacturing sites or offices with sensitive equipment. It’s especially important where service downtime is not acceptable.
Most bypass switches can be operated manually for servicing needs or for the removal of the UPS. The switches will also transfer the load seamlessly to raw mains if the UPS fails ensuring the critical load remains operational.
Yes. A dedicated bypass switch provides a safer way to isolate the UPS for maintenance. It reduces the risk of accidental shutdowns and allows engineers to work without live UPS components energising the system.
Most UPS maintenance bypass switch solutions can be tailored to fit a wide range of UPS models and capacities. Our team can recommend the right bypass switch to match your existing UPS and load requirements.