I have a suge suppressor,similar in design, made by Panamax installed on my house.
It connects to a two pole breaker and ground.
Panamax provides two leds to indicate the device is working properly and gave no requirement for breaker size in the installation instructions.
I think the assumption is made that if the device works as intended, the time period will be faster than the breaker would react anyway.

[This message has been edited by wolfdog (edited 04-07-2003).]