SIEMENS
SIEMENS FXD63B150 Molded Case Circuit Breaker 150A 3 Pole
A 150 A, 3-pole molded case circuit breaker rated 600 V AC and 500 V DC with a 22 kA interrupting rating at 600 V AC, thermal-magnetic trip, and lug terminals for FD-frame panelboards
- ColorTransparent
- 150 A rated current protects three-phase circuits up to 600 V AC
- Thermal-magnetic trip unit gives fixed 150 A overload and instantaneous short-circuit protection
- 22 kA interrupting rating at 600 V AC handles high fault currents safely
- Frame size 250 A fits standard panelboards and switchboards
- Lug terminals accept cable directly for simple installation
FXD63B150 Molded Case Circuit Breaker
The SIEMENS FXD63B150 is a 150 A, three-pole molded case circuit breaker rated for 600 V AC and 500 V DC. It provides thermal-magnetic overcurrent protection for SB switchboards and Sentron panelboards in commercial and industrial power-distribution systems.
Thermals, noise and power draw
Thermal-magnetic trip units operate without active cooling, so the breaker runs silently during normal operation. Power draw is limited to the sensing coils of the trip mechanism and adds no measurable load to the protected circuit.
Bundled accessories and software
The unit ships with integral terminal lugs for direct cable connection and requires no additional software or configuration. Fixed instantaneous trip and 22 kA interrupting rating at 600 V AC are factory-set, simplifying installation and commissioning.
Highlights
- 150 A rated current protects three-phase circuits up to 600 V AC
- Thermal-magnetic trip unit gives fixed 150 A overload and instantaneous short-circuit protection
- 22 kA interrupting rating at 600 V AC handles high fault currents safely
- Frame size 250 A fits standard panelboards and switchboards
- Lug terminals accept cable directly for simple installation
Specifications
| Brand | SIEMENS |
|---|---|
| Color | Transparent |
Questions about this item
How is the FXD63B150 installed in an SB switchboard or Sentron panelboard, and what step is often missed?
Mount the free-standing frame onto the panelboard bus using the 250 A frame size alignment, then secure the terminal connection lugs; the step often missed is verifying the ABC phase connection order before tightening the lugs.
What maintenance or replacement will the FXD63B150 need over its service life?
The thermal-magnetic trip unit has fixed instantaneous and 150 A high/low settings that are not field-adjustable; if calibration drifts or contacts wear after repeated 22 kA fault interruptions, the complete breaker must be replaced.
What limit appears first when the FXD63B150 carries 150 A continuously in a 600 V AC panel?
The 250 A frame rating and fixed thermal trip at 150 A mean the breaker will open on sustained overload before the 22 kA interrupting rating or 500 V DC rating become factors.
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