[Elecraft] K3: Receive Ant Question

[Steve, K4FJ]

Am I correct in assuming that the Rec Ant input is disconnected from the main receiver input upon transmit by way of a relay?  If so, can I further assume that connecting a beverage, or other receive antenna, to the Receive Ant input will cause no harm to the main receiver upon transmit?  In other words, is a relay enough protection?

I ask because I would like to rule out needing an external protection device when using a beverage antenna.  I run full legal power.

Thanks in advance.

73, Steve, K4FJ