Etronix JR 3 Lead Switch Harness ET0778 loom servo connector plug power charge

Etronix JR 3 Lead Switch Harness ET0778

This three lead switch can be used to power an RC RX reciever and while turned off the additonal lead can be used to charge the battery.

A 3-plug switch differs from a 2-plug switch in that there is an extra lead that you can use to connect to a battery charger to charge your receiver battery.

When the switch is 'ON’ the receiver battery is connected to the receiver and the electronics are powered.

When the switch is 'OFF’ the receiver battery is connected to the charging lead so you can charge the battery. This means you don't have to unplug the receiver battery from the switch every time to charge it. Just turn the switch to 'OFF’, connect the battery charger to the switch’s charging lead, and charge away.

The primary difference between Futaba and JR servo connectors lies in their keying/polarity and housing design. Futaba connectors have a prominent tab on the signal (usually black) wire side of the female connector to ensure correct polarity, while JR connectors typically have beveled corners on the male connector and angled tabs on the female connector to help with alignment. Futaba plugs can often be modified to fit JR connectors, but JR plugs may not fit Futaba receivers without modification.

Futaba and JR connectors are generally compatible due to their similar pin spacing and overall size, though Futaba connectors have a keying mechanism that might require modification to fit into a JR connector housing.