Operating Accessories

XF, MX, and MN Voltage Releases

XF and MX voltage releases are standard accessories mounted inside the device. MN voltage release is optional accessory.

The standard voltage releases are designed to receive either pulse-type or maintained voltage operating orders.

XF Closing Voltage Release

The XF closing voltage release closes the device instantaneously when powered if the spring mechanism is charged. The minimum duration of the pulse operating order must be 200 ms.

MX Opening Voltage Release

The MX opening voltage release opens the device instantaneously when powered. The minimum duration of the pulse operating order must be 200 ms. The MX standard opening voltage release locks the device in OFF position if the command is maintained.

MN Undervoltage Release

The MN undervoltage release instantaneously opens the device when its supply voltage drops to a value between 35% and 70% of its rated voltage. If there is no supply to the release, it is impossible to close the device, either manually or electrically. Any attempt to close the device has no effect on the main contacts. Device closing is enabled again when the supply voltage of the release returns to 85% of its rated value.

MCH Gear Motor

This is an standard accessory that is mounted inside the device.

The MCH gear motor automatically charges the spring mechanism when the device is closed, allowing instantaneous closing of the device following opening.

CDM Mechanical Operation Counter

This is an optional accessory that is mounted inside the device.

The CDM mechanical operation counter counts the number of operating cycles and is visible on the front panel. It is compatible with manual and electrical control functions.

This option is compulsory for all source-changeover systems.