A hypertube 3-way-junction you can remotely control with the priority power switch. 150MW

Routing (Power on): 1-2, 2- 3, 3-1 Routing(Power off): 1-3, 3-2, 2- 1

The priority power switch is already integrated and has the name 'junction'. Just place down another one whereever you like and use it as a remote control.

This is the improved version of my prior design (https://satisfactory-calculator.com/en/blueprints/index/details/id/3839/name/Remote-controlled+3-way-junction). It takes less space and does not slow you down anymore.