Yes, load straps are required for proper operation of the 600CB10 panel. Since load requirements and breaker sizes are unknown by Telect at the time of manufacture, load straps are sold separately. Telect offers 3 different load straps, based on the number of poles the supporting circuit breaker uses. The load strap part numbers include:
Single Load Strap = 600CB1X-1PK
Double Load Strap = 600CB1X-2PK
Triple Load Strap = 600CB1X-3PK