Wylex NH Range Mk 1 - NSB40-B - 40a Type B Single Pole MCB Used
Wylex NSB40-B Mk 1 - 40a Type B Single Pole MCB. Wylex Part Code: NSB40-B. This is the older form of NSB MCB with the black coloured toggle switch. From the NH NSB range. Conforms with British Standard: BS EN 60898: 1991.