Schaefer, Inc.

For over 55 years, Schaefer has delivered high-reliability power conversion solutions for mission-critical Utility and Nuclear applications. We design and manufacture AC/DC power supplies, DC/DC converters, battery chargers, and custom power systems engineered for uncompromising performance in demanding environments. All products are engineered and manufactured in-house, ensuring full control over quality, configuration management, and long-term support.

Our power solutions are widely deployed across the energy sector—including fossil, nuclear, and renewable generation—and throughout the power infrastructure, from power stations and substations to generation, transmission, and distribution systems. Schaefer products are trusted in safety-related and balance-of-plant systems, including protection and control, switchgear, SCADA/telecom, and auxiliary power applications. They are designed to meet stringent industry standards for electrical performance, environmental durability, seismic resistance, and electromagnetic compatibility. From high-temperature operation and vibration tolerance to extended-life components and conservative electrical design practices, every detail is focused on reliability, longevity, and predictable performance.

Schaefer offers a broad portfolio of standard and custom products covering a wide range of input voltages, output voltages, and power levels. Product offerings include:
• AC/DC power supplies for utility and industrial distribution voltages
• DC/DC converters for critical electronics and controls
• Industrial battery chargers for lead-acid, nickel-cadmium, and lithium-based battery systems
• Redundant and modular power systems with load sharing and fault tolerance
• Custom engineered power shelves, racks, and cabinets

Power levels range from 150W – 40kW and 400VA-45kVA for enclosed supplies for control electronics to multi-kilowatt chassis, rack-mounted, and cabinet-based systems capable of supporting large auxiliary and infrastructure loads. Solutions are available for both single-phase and three-phase applications, with wide input tolerance, high efficiency, and tightly regulated outputs to support sensitive loads in harsh electrical environments.

Schaefer works as an engineering partner—not just a supplier. Our applications engineers collaborate closely with customer design teams to develop optimized standard or fully custom solutions tailored to exact system requirements, including mechanical packaging, input/output configuration, redundancy architecture, monitoring and communications, and environmental hardening. With long product life cycles, stable form-fit-function control, and responsive technical support, Schaefer supports all designs for 32 years—helping utilities and nuclear operators minimize risk, simplify qualification, and maintain confidence in their power infrastructure for decades.