Product Description

Designed to deliver maximum power efficiently in a compact footprint, the Master HP MHT 250 from Specialist Power Systems is a popular solution for almost any mission-critical environment.

Up to 8 UPS systems can be installed in parallel to provide the necessary redundancy and capacity. Systems can be installed in centralised or decentralised architecture and in a variety of configurations, including:

UPS Group Synchroniser (UGS): enables 2 or more non-parallel UPS devices to remain synchronised even during mains power failure. UGS also enables a Riello UPS to synchronise with another independent power source, even one with a different power rating.

Parallel Systems Joiner (PSJ): this connects 2 groups of UPS in parallel using a power coupling switch. If one of the UPS in the group fails, it is automatically excluded and the PSJ links the remaining UPS to the other group through an external bypass.

A three-phase online UPS utilising double conversion technology, it is a proven power protection provider for data centres, electro-medical devices, IT networks, telecoms systems, and industrial machinery. 

The Master HP has zero impact on connected power sources such as grid networks or generators and delivers a unity power factor. With an IGBT-based rectifier, it achieves exceptional operating efficiency compared to a more conventional thyristor-based rectifier. While its output isolation transformer means the UPS can be supplied by 2 independent lines, has a higher immunity to harmonics, and provides all-round better load protection.

Mains input quality is constantly monitored, with the system selecting the most appropriate and efficient operating mode based on any interference (Smart Active mode with up to 98.5% efficiency) or circular redundancy (Parallel Energy Saving mode).

UPS maintenance is easy thanks to a removable front panel, while high power is achieved in a compact, space saving footprint. As an example, a 250 kVA version can be installed in 0.85m2.
Users benefit from advanced monitoring and communication provided by a front panel-mounted LCD graphic display clearly showing key measurements and data, including battery levels, input and output voltage, and UPS status and alarms.

The Master HP range integrates seamlessly with PowerShield3, PowerNetGuard, and the wider range of advanced network communications software available from Riello UPS.

Specialist Power Systems are an approved sales partner to Riello UPS in the UK with expert technical knowledge. Call us on 01234 851155 to discuss your requirements and how we can help you find the right product and support.

Product Specification

Part No

MHT 250

Capacity (VA / kVA)

250 kVA

Maximum Output (Watts)

225000 Watts

Form Factor




Run Time


Warranty Length

3 Years

Battery Type

VRLA AGM / GEL; NiCd; Supercaps; Li-ion; Flywheels









3 years

Optional Accessories

Here at Specialist Power Systems we offer a wide range of manufacturer specific accessories from a UPS Network Card through to an External Maintenance Bypass Switch. Please get in touch so we can ensure you get exactly what you need to stay protected.

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Maintenance Packages Available
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For more information, please call us on +44 (0) 1234 851155 or send us a message below.

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