Yes, several manufacturers make 208V 3-phase 150A GFCI breakers, although they're often not readily available off-the-shelf and are typically special order items. You're likely to find them as part of a larger panelboard solution or as a specific order item for industrial applications.Here's the thing: 150A GFCI breakers, especially in 3-phase, are rare for several reasons, primarily cost and nuisance tripping. GFCI protection at that current level is typically implemented using ground fault relays and current transformers instead of a standard circuit breaker. This is a more robust and flexible solution for larger loads.However, breaker-based options do exist.Here are a few manufacturers and potential avenues to explore: Schneider Electric/Square D

They offer GFCI breakers in various configurations, but a 150A 3-phase 208V model would almost certainly be a special order. You'd need to contact their custom breaker team. Look at their PowerPacT or Masterpact series. The best approach is to contact a Schneider Electric distributor directly. Example series to investigate (but NOT a specific model number, just a starting point): PowerPacT L-Frame or Masterpact NW

Why this is a good starting point

Schneider Electric has a strong presence in the industrial and commercial power distribution space.

Eaton

Eaton also has a robust line of breakers, and like Schneider Electric, they are capable of manufacturing custom solutions. You'd need to work with their sales engineers. Example series to investigate: Series G or Series C breakers.

Why this is a good starting point

Eaton is a major player in circuit protection.

ABB

ABB is another major manufacturer with the capability of producing high-amperage GFCI breakers. Again, you will need to contact a sales representative. Example series to investigate: SACE Tmax or Emax 2 series.

Why this is a good starting point

ABB is globally recognized for its circuit protection solutions.

Important Considerations and Why it's Difficult to Find a Direct Link


Special Order/Custom Configuration

These are not off-the-shelf items. Manufacturers don't typically list them in their standard catalogs because the demand is low and they are engineered-to-order.2.

Application-Specific

GFCI protection at this level is usually for very specific applications (e.g., critical equipment, specialized industrial processes) where ground fault protection is mandated.3.

Cost

A 150A 3-phase GFCI breaker will be very expensive. A ground fault relay/current transformer system is often a more cost-effective solution at this current level.4.

Nuisance Tripping

High-amperage GFCI breakers can be prone to nuisance tripping in certain environments due to leakage current from long cable runs, variable frequency drives (VFDs), and other equipment. This is another reason why ground fault relays are favored in many applications.5.

Code Compliance

Carefully review the applicable electrical codes (NEC, etc.) to ensure that a GFCI breaker is the required solution. Sometimes, ground fault equipment protection (GFEP) is sufficient, and a GFEP system is significantly different from a GFCI system designed for personnel protection. GFEP trips at a higher current level than GFCI (e.g., 30mA for GFCI vs. 30A for GFEP).

Recommended Steps


Contact Manufacturers Directly

The best approach is to contact the technical sales departments of Schneider Electric, Eaton, and ABB (and possibly others) and explain your specific requirements. Be prepared to provide details about the application, voltage, current, interrupting rating, and any applicable standards.2.

Work with a Reputable Electrical Distributor

A good electrical distributor that specializes in industrial and commercial power distribution can help you navigate the options and connect you with the right manufacturer representative.3.

Consider Ground Fault Relays/Current Transformers

Investigate ground fault relay systems as an alternative. These systems are generally more reliable, flexible, and offer better control over the trip settings. Companies like Littelfuse, Bender, and others specialize in ground fault relays.

In Summary: While a 150A 3-phase 208V GFCI breaker can* be manufactured, it's not a standard item. Expect to pay a premium, wait for a custom order, and carefully consider ground fault relay alternatives. The best path is to contact manufacturers and experienced distributors directly to discuss your specific needs. Be sure to thoroughly understand the applicable electrical codes to ensure you're choosing the correct solution. Flag for review