LZS Plug-in Relay A range of plug-in coupling relays from Siemens available both as complete devices and as single modules for self assembly or spares. The complete LZS devices consist of a socket, plug-in relay, hold/reject clip, LED module and inscription label. All designs boast tried and tested screw or push-in, spring loaded terminals with hard gold-plated contacts for optimum interaction with electronic controls. The PT relay design does not feature a latching mechanism. Tested to AC-15 and DC-13 switching capacity Vibration proof connection