What is 3S Industries? In today's competitive market, your purchasing source is critical for the quality, service and price you offer to your critical customer. 3S Industries, is a leading manufacturer for transformers and inductors in California. Our advanced manufacturing technology for magnetic components has enabled us to supply a supreme quality product to our valued customers. 3S industries takes pride in its skilled and experienced engineering staff who have been acknowledged as the "top engineers" in the industry. We stay up-to-date in all the latest innovations and regulations for product development.