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What overcurrent protection is required on the SDSA2040 Surge Protection device?

What overcurrent protection to use on the SDSA2040 Surge Protection device?
Product Line:
Surge Protection Devices, SPD  

SDSA, 3ph
Breaker specification to protect equipment
The SDSA2040,  3Ph come with #12 wire.  You can connect it three different ways. 
1) You can connect to a Square D (if you have Square D) double lug per/phase breaker, ie. 20A/3 pole using the wire leads that are #12. 
2) You can connect to a dedicated 20A/3P breaker (if not a double lug breaker)
3)  You can connect directly to the bus because it is a Type 1 device.  Type 1 allows direct connection with or without an overcurrent protection device. 

To reach a Surge Protection Specialist direct please call 800-577-7353 or email:      
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