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68 Eaton Corporation CA0135004EN Minimum clearances IZM circuitbreakers, IN switchdisconnectors Breaker type Enclosure clearance To insulated surface To grounded metal surface With cell switch or locking facilities Withdrawable A B 0 25 0 25 0 25/75 Fixed A B 150 30 250 70 - - W Width Width of cassette + 75 mm H Height 550 mm D Depth 450 mm (front control panel bay) V Ventilation holes 160 cm² (800 - 3200 A) 320 cm² (4000 A) Electrical clearance The following information about electrical clearance is intended to provide a guideline for the installation of fixed type or drawout type circuit breakers in an enclosure. The diagram and related dimensions can be used for reference. Electrical clearance dimension (mm) Recommended safety clearances Recommended enclosure clearance and ventilation The typical enclosure drawing and dimension table is intended as a guideline for designing a circuit breaker enclosure. The enclosure dimensions and required ventilation openings should be considered at the designing phase. Recommended enclosure/ventilation opening dimensions A A B B 100 Ventilation openings (do not cover!) Cell switch (optional) Locking facilities (optional) D W H V V Top or rear vent Rear or lower vent