Epoxy Encapsulated CT103 Miniature Current Power Transformer For Power Monitoring Metering

The CT103 is a miniature PCB-mount current transformer built on a toroidal core and fully encapsulated in black epoxy resin. Its D-shaped body with a central through-hole allows the primary conductor to pass directly through the window, while two straight solder pins provide a secure through-hole connection to the PCB. The sealed construction protects the winding against moisture, dust and mechanical stress, making the CT103 a compact and repeatable current-sensing solution for board-level metering and monitoring designs.

• High efficiency – toroidal core structure for effective magnetic coupling and low loss
• Low noise – epoxy-encapsulated winding suppresses mechanical vibration and audible noise
• Stable performance – sealed body keeps output consistent under humidity, dust and vibration
• Durable & reliable – one-piece resin housing resists moisture ingress and mechanical shock
• Space-saving PCB design – D-shaped footprint with two through-hole pins for direct board mounting
• Open-window primary – the central aperture accepts a pass-through primary conductor, no primary winding required

Custom electrical parameters are available on request. Please send us your rated current, turns ratio and output requirements, and our engineering team will match or develop a suitable version.

• Electric energy meters and smart metering modules
• Power monitoring and load-current measurement boards
• Overcurrent detection and protection circuits
• Switching power supplies and inverter control boards
• Industrial automation and instrumentation equipment

Please confirm the electrical rating of the CT103 against your circuit requirements before design-in.