The EC3 connector is a popular type of electrical connector used extensively in the radio-controlled (RC) hobby industry. It's designed for medium-power applications, offering a balance between physical size and power handling capability. Here are the key features of the EC3 connector:

Current Capacity: EC3 connectors can handle up to 60 amps of continuous current, making them suitable for a wide range of RC vehicles, including cars, boats, and smaller aircraft that require moderate power.

Design: EC3 connectors have a 3.5mm bullet diameter and are typically encased in a blue plastic housing. This housing is designed to prevent short circuits and ensure that connections can only be made with the correct polarity, thanks to its keyed design.

Safety and Convenience: The connectors are designed to be easy to connect and disconnect, providing a secure connection that helps prevent accidental disconnections under load. The housing is genderless, which simplifies the setup and reduces the number of spare parts needed.

EC3 connectors are well-regarded for their robustness and reliability, making them a common choice among hobbyists who need a dependable connection that can handle a significant amount of power without being as large or capable as the higher-capacity EC5 connectors.