GE Industrial Solutions Entellisys Low Voltage Switchgear - Manuel (Page 52)

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Appendix B. Circuit Breaker Rejection
Features
General
In general, drawout breakers of the same type and rating are
interchangeable in their equipment compartments; drawout
breakers of different envelope sizes or short circuit ratings are
intentionally made non-interchangeable. To prevent inserting the
wrong type breaker into a drawout compartment, unique “rejection
hardware” is affixed to each breaker and its cassette. The rejection
is accomplished by pins on the sides of the breaker and the blocks
on the sides of the cassette.
REJECTION FEATURE
This factory-installed, pin and gate device prevents the
insertion of a circuit breaker into a cassette if the nominal
rating of the breaker is incompatible with that of the
cassette and its ancillary equipment.
Fig. A1 A breaker pin Assembly
Fig. A2 Cassette block assembly
Fig. A3 Cassette & Breaker Rejection
.