As part of Electricals 24/7 domestic circuit protection, comes the Wylex 50A NHXB / NSB MCB-B Curve at an affordable price.\r\nThis product is for use in all Wylex domestic 'NH' consumer units, with the 'NHX' range of RCBOs and MCBs replacing the now obsolete 'NSB' range.\r\nThis MCB comes as a 'B' type breaker and will effectively trip between 2 and 5 times the full load current.\r\nIn doing this it makes the product very suitable for domestic installations.\r\nHowever, if you are unsure at all we recommend you check with a fully qualified electrician before fitting the product.