[Al Skierkiewicz]

To be more accurate...
<R55> ...
 If the compressor is used, the air compressor Spike
relay power feed must be protected with a 20A fuse or
20A circuit breaker. No other electrical load can be
connected to this breaker...
 Relay modules must be protected with a 20A circuit breaker.

The first section allows you to replace the Spike 20 amp fuse with a circuit breaker. If you don't do this now you will later after you have gone through a box of 20 amp fuses. The second section stipulates only 20 amp circuit breakers must protect a relay module.

Start current on the compressor can be 25 amps while run current is 10-12 amps.