The Allen-Bradley Bulletin 140M-D8V motor-protection circuit breakers are made for:
- The output of variable frequency drives in multi-motor installations, providing individual overload protection in multiple motor applications, as required by NEC.
- The output of VFD, which must be limited to 400 hertz or less to prevent thermal degradation.
- Disconnection of motor branch circuits, branch-circuit and short-circuit protection (including magnetic protection), overload/thermal protection and manual switching.
- Limiting current with a fixed magnetic trip.
- Interrupting ratings at 400 volts and 480 volts are available up to 65 kiloamps.
- The VFD output pulse-width modulation frequency must be limited to 4 kilohertz or less.
- The circuit breakers provide motor overload protection at trip class 10.
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