EC3 Pinout
3 mm bullet-in-housing two-pole RC connector rated about 60 A.
Overview
The EC3 is a two-pole RC power connector built from two 3.0 mm bullet contacts in a polarized polycarbonate housing. The keyed shell ensures correct orientation.
One bullet is positive, one negative. Common on LiPo packs and ESCs, between the smaller XT60/EC2 and the larger EC5 in capacity.
Pinout
| Pin | Name | Function | Description |
|---|---|---|---|
| + | Positive | SIGNAL | Positive 3.0 mm bullet contact |
| - | Negative | SIGNAL | Negative 3.0 mm bullet contact |
Notes
- Two 3.0 mm bullets in a keyed housing - the shell sets polarity.
- EC3 housings do not mate with EC5.
Reference: Horizon Hobby / E-flite EC3 connector specification· verified 2026-06-27