DEMA CPM 310 G User Manual page 20

 Locking Mechanism
As a subsystem of the patented DDS (DEMA Draw out System) technology, internal unit locking mechanism
provides locking and drawing out of the internal unit with ease. Locking ensures safe electrical contacts.

Current Transformers
Transforms secondary current into useful signals to supply measurement and protection circuits with the
information they need. Current transformers are integrated into the internal unit – this guarantees fast
maintenance and replacement operations without having to carry out calibration procedures.
 Dip Switches
CPM 310 G Digital Overcurrent Protection Relays can operate with X/1A or X/5A current transformers. The
dip-switches shown on the image above enables the setting of the relay to work with X / 1 A or X /
5 A current transformers. The dip-switches are used also for earth fault protection setting range.
 Internal Unit Lock Handle and Release Trigger
The internal unit lock handle is released by the release trigger - that enables the drawing out of the
internal unit by rotating the handle in upwards direction, as shown in the above figure.
 Lock Button
Lock button is used for locking the handle and the internal unit after the internal unit is drawn completely
into the case. Before drawing the internal unit in, lock handle must be positioned parallel to the ground. ↺
CPM 310 G: Internal Unit – Right Side View
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