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Are circuit breaker enclosures supplied with a dual cover interlock?

NEMA 1 (F or S suffix) and NEMA 3R (R or RB suffix) enclosures are not provided with a dual cover interlock. NEMA 4/4X/5 (DS suffix) and NEMA 12/3R (AWK suffix) are provided with a dual cover interlock. A dual cover interlock prevents the cover from being opened with the external operating handle in the ON position and prevents the external operating handle from being turned to the ON position if the cover is open.

CTA-ID : 2049980
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