VMware SDDC Manager
VMware NSX
NSX service certificates are user-facing for services such as load balancer, VPN, and TLS Inspection.
The policy API manages service certificates. Non-service certificates are used by the platform for tasks such as cluster management. The management plane (MP) or truststore APIs manage non-service certificates.
There is no impact for LoadBalancer/Virtual Servers when replacing NSX Manager appliance certificates.
For more information on the different types of certificates in NSX, please refer the article: Types of Certificates