Industrial-Frequency Power UPS — S-Series Three-Input Single-Output Built-In for Power-System Rooms

Many power-system rooms have three-phase service entrances but single-phase DC and protection loads. The S-series three-phase-input, single-phase-output built-in tier is built for exactly that pattern: true three-phase input handling, clean single-phase output, and a true output isolation transformer — packaged to install inside the power-system cabinet the panel team already trusts.

Built for the cabinets where the supply is three-phase and the load is single-phase

When the building delivers three-phase but the protection and SCADA loads are single-phase, the wrong UPS ends up under-using one phase and over-stressing another. The three-phase-input built-in tier takes three-phase in and converts it correctly, so the upstream distribution stays balanced and the load sees a clean single-phase sine. It lives inside the cabinet — and it respects the realities of power-system panel architecture.

Where it makes the difference

• Substation DC battery rooms and protection panels with three-phase supply and single-phase DC loads.

• Plant-control cabinets and DCS panels running protection and SCADA loads from three-phase service.

• Power-distribution automation panels with three-phase service and single-phase loads.

• Rail-power and traction substation control panels with three-phase supply.

• Energy-management and metering rooms with three-phase service and single-phase loads.

What you gain

• An industrial-frequency online UPS with a true output isolation transformer, sized to install inside a power-system cabinet.

• Three-phase input handling that keeps the upstream distribution balanced and stable.

• DSP-based digital control with strong overload capability and inrush tolerance.

• Front-accessible terminations and engineered thermal behaviour for in-cabinet operation.

• Standard communication interfaces — RS232, RS485, and dry contacts — for plant SCADA integration.

• An optional SNMP card for higher-level monitoring stacks.

• Compliance with industry-standard design codes for power-system environments.

How the platform works for you

The three-phase-input built-in tier uses the same industrial-frequency online double-conversion platform as the rest of the S-series family, with a true output isolation transformer and a chassis engineered for in-cabinet thermal and service realities. The result is a clean single-phase sine output, predictable inrush behaviour, and a service model that respects the way power-system panels are built and serviced.

Service, integration, and lifecycle

Built-in units are supported by the same global field-engineering network as the SDL line, with regional spares and power-system-trained service teams. Integration with plant SCADA, DCS, and BMS is straightforward via standard interfaces, firmware updates are routine, and the chassis is engineered for control-board upgradeability across generations.

Frequently Asked Questions

• Why three-phase input and single-phase output? Many real-world power-system rooms have three-phase supply but single-phase protection loads; this tier matches that topology directly.

• Does this help upstream power quality? Yes — true three-phase input handling keeps the building's distribution balanced.

• Can it start heavy protection loads? Yes — strong overload capability and inrush tolerance are engineered in.

• What communication options are available? RS232, RS485, dry contacts, and an optional SNMP card.

• Is there a bypass for service? Yes — a maintenance bypass is provided for safe service on a live system.

• How is service handled? Regional spares, factory-trained power-system engineers, and predictable maintenance schedules.

• Is it future-proof? Modular firmware and a field-replaceable control board extend useful life across generations.

• What warranty and service options exist? A standard multi-year warranty with extended and on-site plans.

Information Security and Data Protection

Role-based access, audit-friendly event logs, and encrypted remote communication where supported by your plant SCADA or management platform protect operational data. Telemetry stays inside your plant network boundary by design.

Explore the Industrial-Frequency Power UPS Family

• Industrial-Frequency Power UPS — SDL Single-Phase Line for Power Plants and Substations

• Industrial-Frequency Power UPS — S-Series Single-Phase Built-In for Power-System Rooms

• Industrial-Frequency Power UPS — S-Series Single-Phase External Wall-Mount for Power-System Rooms