Siemens B380GFHH molded case circuit breaker is rated 80A and 208Y/120VAC, with 3 poles, 3 phase and a 65kAIC interrupting rating. It provides GFCI protection and has a thermal magnetic trip with fixed thermal and fixed magnetic settings, plus long-time and instantaneous trip functions. This HBQDPF series, B family breaker has a B Frames physical frame, panelboard mounting, a load side lug terminal connection and pigtail neutral. Conductor temperature is 60/75 °C. Standards are RoHS and REACh.
The 65kAIC rating describes the breaker's ability to interrupt short-circuit current. Available fault current at the installation point must not exceed that rating.
What does the GFCI protection add to this breaker?
GFCI protection detects a current imbalance that can indicate current flowing through an unintended path to ground and trips the circuit. Select this feature when the circuit requires ground-fault circuit-interrupter protection in addition to overcurrent protection.
What installation planning does the pigtail neutral require?
The pigtail neutral requires a connection to the system neutral for the GFCI function. Plan the neutral routing and termination as part of the breaker installation.
Can I adjust the overload or instantaneous trip settings?
The thermal and magnetic trip settings are fixed. The thermal element provides long-time overload protection, while the magnetic element provides instantaneous response to high fault current, so select the breaker rather than relying on field adjustment.
How does the 60/75 °C conductor temperature rating affect wire selection?
Use the 60/75 °C conductor temperature rating when determining the applicable conductor ampacity for the termination. Conductor insulation temperature alone does not determine the ampacity you can use.
How are the outgoing circuit conductors terminated?
The load-side connection uses lugs, so the outgoing conductors terminate directly at those lugs. Prepare and secure each conductor using the applicable lug termination requirements.
How should I use the Siemens B380GFHH's 80A rating when sizing a circuit?
Use the 80A rated current as a selection reference when evaluating the circuit load. Its thermal-magnetic trip provides long-time protection against sustained overcurrent and instantaneous response to high-current faults.
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