Siemens B390GFHH GFCI Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Quantity
Siemens B390GFHH - 90A GFCI Molded Case Circuit Breaker
New
Quantity
Description
Siemens B390GFHH molded case circuit breaker is rated 90A at 208Y/120VAC, with 3 poles, 3-phase operation and a 65kAIC interrupting rating. It features GFCI protection and a thermal magnetic trip with fixed thermal and fixed magnetic settings for long-time and instantaneous trip functions. The B Frames breaker has panelboard mounting, a load side lug terminal connection and pigtail neutral.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B390GFHH |
| Series | HBQDPF |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 208Y/120VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 208Y/120VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards |
| Wire Gauge | 4-1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Special Classification | GFCI |
|---|---|
| Temp Rating | 40C |
Product FAQs
8 answersHow should I use the Siemens B390GFHH's 90A rating when sizing a circuit?
The 90A rating is the breaker's rated current. Use it when coordinating the circuit load, conductor ampacity and overcurrent protection under applicable circuit-sizing rules.
How does the 65kAIC interrupting rating affect selection?
The 65kAIC rating describes the breaker's ability to interrupt fault current at its rated voltage. Verify that the available fault current at the installation point does not exceed this rating.
What does GFCI protection do on this breaker?
GFCI protection monitors current imbalance and trips to reduce electric-shock risk from ground faults. Choose this feature when the circuit requires GFCI protection in addition to overload and short-circuit protection.
What does the pigtail neutral mean for installation?
The pigtail is the breaker's neutral lead and must be connected to the system neutral as part of installation. Plan for routing and terminating that lead when laying out the circuit wiring.
Can I adjust the thermal or magnetic trip settings?
Both the thermal and magnetic trip settings are fixed. Long-time thermal tripping responds to sustained overloads, while instantaneous magnetic tripping responds to short circuits, so select the breaker with these fixed operating characteristics in mind.
How are outgoing circuit conductors connected?
The breaker uses load-side lug connections for outgoing circuit conductors. Prepare and secure those conductors in the lugs to create mechanically secure electrical terminations.
What electrical system is the B390GFHH rated for?
The Siemens B390GFHH is rated for a 208Y/120VAC, three-phase wye system. Use both the voltage and the wye configuration when selecting this breaker for a circuit.
How do the 60/75 °C conductor temperature ratings affect wire selection?
The 60/75 °C conductor temperature rating guides the ampacity basis used for wire sizing. Use the applicable temperature basis for the installation when selecting conductors with adequate ampacity for the circuit.
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