Teledyne Relays S48A50 USNT Relay

Teledyne Relays S48A50 USNT is a solid state relay (SSR) designed for high-current AC load switching in industrial automation, process control, and power distribution systems. It switches loads up to 50 A at 24–520 VAC with a peak blocking voltage of 1200 V, and uses a zero-cross turn-on SCR/Triac output with optical isolation between control and load, making it suitable for applications such as industrial heaters, motor control panels, HVAC equipment, packaging machinery, process automation, and OEM control cabinets. The device features an internal snubber, high surge immunity, low EMI, and excellent thermal performance; the control voltage range is 90–240 VAC/VDC, and the unit belongs to Teledyne Relays' S Series (base part S48A50) with MPN S48A50 USNT. Common replacements include S48D50, S48R50, and S48A125. Maintenance technicians, automation engineers, and system integrators use this SSR for OEM replacement, repair, retrofit, and preventive maintenance of industrial electrical systems.