Wago 6mm terminal block awg 28 12 281 series wago 281 665281 401 wago 281 665281 401 6mm wide 4 conductor diode 250v terminal block colour grey for wire sizes awg 28 12 pack size 50 wago 281 665281 401 6mm 4 cond diode 250v terminal block grey awg 28 12 50pk