Semiconductor Switching
Power semiconductor devices provide rapid source transfer without relying on conventional electromechanical switching.
Liebert NPS-I and NPS-II Network Power Switches provide rapid transfer of critical loads between two independent power sources. Semiconductor switching, intelligent microprocessor control and selectable source parameters help maintain power continuity when the preferred source moves outside acceptable operating limits.
The Liebert NPS-I and NPS-II are intelligent static transfer switches designed to maintain continuity of power for critical loads supplied by two independent AC power sources.
The two inputs may be supplied by separate UPS systems or by one UPS system and an alternative bypass source. This allows power-path redundancy to be extended closer to the connected critical equipment.
Semiconductor switching elements allow the system to transfer the load rapidly when the preferred source fails or moves outside user-defined voltage and frequency limits.
Independent microprocessor control continuously observes source voltage, frequency, phase conditions and other operating parameters before determining which source should supply the load.
Users can select source priority and configure model-dependent operating parameters. Automatic and manual transfer functions provide flexibility for source failures, testing and planned power-system maintenance.
The NPS-I supports compact single-phase applications, while the higher-capacity NPS-II supports three-phase critical loads with selectable sensitivity levels and floor-mounted cabinet configurations.
Liebert Network Power Switches combine semiconductor switching, source monitoring and configurable control for critical dual-source power systems.
Power semiconductor devices provide rapid source transfer without relying on conventional electromechanical switching.
Intelligent controllers supervise source conditions and manage transfer decisions independently of the connected power sources.
Users can select the preferred power source and configure fixed or variable source-priority operation on supported models.
Local indicators and displays provide visibility of source health, source priority, switch status, alarms and load conditions.
Automatic transfer protects the load during a source problem, while manual transfer supports planned source shutdowns and maintenance.
Optional Modbus, serial, Ethernet and potential-free contact interfaces support remote status and alarm monitoring.
Liebert NPS-I and NPS-II continuously evaluate both incoming sources and transfer the load when the active source exceeds the configured operating limits.
Single-phase and three-phase configurations support different current ratings, switching poles, transfer sensitivities and installation requirements.
Review the model ranges, electrical ratings, transfer performance, communication and environmental specifications of the Liebert Network Power Switch family.
Important information about available ratings, transfer performance, model differences and communication options.
NPS-I is available in 16A, 32A and 63A single-phase configurations. NPS-II supports three-phase configurations from 60A to 400A, depending on the selected model.
NPS-I transfers in less than 5ms under synchronised conditions. NPS-II supports model settings below 8ms, 5ms or 3ms according to the selected sensitivity level.
NPS-I is designed for lower-current single-phase applications and is available in a compact 3U rack-mounted format. NPS-II supports higher-current three-phase loads in floor-mounted cabinets.
Yes. Depending on the model and selected options, remote monitoring is available through RS-232, Ethernet, RS-485 Modbus and potential-free contact interfaces.
Explore the rack-mounted NPS-I design, floor-mounted NPS-II cabinet and dual-source static-transfer architecture.
Contact Intermax for Liebert NPS-I and NPS-II pricing, availability and product information.
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