One spare module for part number SY1C40XLED. Please note that this product is a two module device consisting of 1 x SY1C40XLED/MOD/NPE (No LED) and 1 x SY1C40XLED/MOD/L (LED).
If in doubt please call our office on 01484 851 747.
Surge Protection Devices Ltd
TEL: 01484 851747
FAX: 01484 852594