Comus mcs 137 alum magnetic contact switch magnets and brackets armoured cable comus mcs 137 3 this loop type normally closed magnetic contact switch has an armoured cable and is supplied with a fixing bracket the switch has a weather resistant aluminium housing and is suitable for use under harsh conditions in both commercial and industrial applications the switch is supplied with a matching magnet comus mcs 137 3 aluminium switch magnet amp bracket set with armoured cable