This is the MK Sentry 7935S 20A 30mA RCBO Type B Module suitable for Sentry Consumer Units
Note: this RCBO is part of the MK 7900 series, which replaced the 6900 series since Oct 2009; the MK 7900 series are interchangeable with each other - however, the switches do not align exactly with the old MCB' & RCBO'
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