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Calex Mfg. Co., Inc. is a privately held company with corporate headquarters located in Concord California, 25 miles east of San Francisco. Calex was founded as a partnership in 1962 with the mission of developing instrumentation and power conversion products and providing world class service and quality. The company incorporated in 1963.

Calex Mfg. Co., Inc is a middle level "high tech" company and comprises 3 divisions, Calex, Contech and Green Watt Power:

Calex: Calex manufactures roughly 40,000 products each month and has over 1000 different standard and custom catalog products.
 - DC/DC Converters - these printed circuit board mounted products are used in telecommunications, medical instruments, military and industrial control systems. Input voltages range from 3VDC to 300VDC. Output voltages range from 0.75VDC to 180VDC. Products are available in both surface mount and through hole configurations. Calex also offers DIN Rail mount converters for process control applications. Calex offers both standard and custom solutions.
- Power Supplies - encapsulated printed circuit boards mounted and un-encapsulated chassis mounted AC to DC power supplies with power levels from 1.5 watts to 480 watts. Pin mount options are available.

ConTech: ConTech offers a full selection of DC DC converters, AC DC power supplies for the industrial, commercial, and medical industries. ConTech offers single and dual output DC DC converter solutions from 1 to 50 watts in industry standard footprints. Standard footprints include SIP, DIP, SMT, 1x1 and 1x2 thru hole patterns. All ConTech DC DC converters are RoHS compliant. UL 60950 and UL60601 agency approvals are available on selected models. ConTech offers a full line of switch mode AC DC supplies including; encapsulated PCB mount, Din Rail mount, and chassis mount AC DC power supply products . Encapsulated solutions are from 4 to 60 watts, open frame chassis mount AC DC power supplies from 25 watts up to 150 watts, and power factor corrected Din Rail mount AC DC power supplies from 120 watts to 480 watts

Green Watt Power: Green Watt Power (GWP) specializes in power supplies and power solutions with enhanced functionality for LED lighting, Electric Vehicle and related applications.For the Electric Vehicle market, GWP offers application specific DC/DC solutions as well as chargers up to 1200 Watts. For LED lighting applications GWP specializes in architectural, street, indoor and general purpose lighting, signage, displays and commercial refrigerator and appliance lighting.