The type SR is the basic version of the S-Series. It is a working current lock that opens when voltage arrives. It is permanently loadable with a voltage between 10 and 24V. The adjustable striker has a clearance of 4mm. The lock is equipped with a bi-directional diode and is mounted on a symmetrical faceplate The type SDR has the optional latch for manual release. Standard working current strike plate Non-voltage locked Symmetrical - suitable for left and right handed doors Manual release possible via lever Permanently unlockable Built-in bi-directional diode Operating voltage 10 - 24 V AC/DC With faceplate