Ground Fault Protection is available in an Explosion Proof Combination Starter 

Optional Ground Fault Protection can be added to both explosion proof and non-explosion proof
combination starters supplied by Cerus Industrial. A circuit breaker with earth leakage and Class 1
ground fault protection will be supplied. The circuit breaker allows a smaller enclosure than what
would be required if a zero sequence current transfomer were used. A smaller enclosure will give
space and cost savings.

Special combination starters may also be built to your specifications.

Explosion Proof Combination Starters

Ground Fault Circuit Breaker