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Manual source-changeover systems
Interlocking of two or three toggle-controlled
devices
Interlocking system
Two devices can be interlocked using this system. Two identical interlocking systems
can be used to interlock three devices installed side by side.
Authorised positions:
one device closed (ON), the others open (OFF)
b
all devices open (OFF).
b
The system is locked using one or two padlocks (shackle diameter 5 to 8 mm).
This system can be expanded to more than three devices.
There are two interlocking-system models:
one for Compact NSX100 to 250
b
one for Compact NSX400/630.
b
Combinations of Normal and Replacement devices
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switch-disconnectors of the same frame size can be interlocked. The devices must
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Interlocking of two devices with rotary handles
Interlocking system
Interlocking involves padlocking the rotary handles on two devices which may be
either circuit breakers or switch-disconnectors.
Authorised positions:
one device closed (ON), the other open (OFF)
b
both devices open (OFF).
b
The system is locked using up to three padlocks (shackle diameter 5 to 8 mm).
There are two interlocking-system models:
one for Compact NSX100 to 250
b
one for Compact NS400/630.
b
Combinations of Normal and Replacement devices
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switch-disconnectors of the same frame size can be interlocked. The devices must
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Interlocking of a number of devices using keylocks
(captive keys)
Interlocking using keylocks is very simple and makes it possible to interlock two or
more devices that are physically distant or that have very different characteristics, for
example medium-voltage and low-voltage devices or a Compact NSX100 to 630
circuit breaker and switch-disconnector.
Interlocking system
Each device is equipped with an identical keylock and the key is captive on the
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open (OFF position) the device with the key before the key can be withdrawn and
used to close another device.
A system of wall-mounted captive key boxes makes a large number of combinations
possible between many devices.
Combinations of Normal and Replacement devices
All rotary-handle Compact NSX100 to 630 circuit breakers and switch-disconnectors
can be interlocked between each other or with any other device equipped with the
same type of keylock.
Interlocking of two devices on a base plate
Interlocking system
A base plate designed for two Compact NSX devices can be installed horizontally or
vertically on a mounting rail. Interlocking is carried out on the base plate by a
mechanism located behind the devices. In this way, access to the device controls
and trip units is not blocked.
Combinations of Normal and Replacement devices
All rotary-handle and toggle-controlled Compact NSX100 to 630 circuit breakers and
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in versions, with or without earth-leakage protection or measurement modules.
An adaptation kit is required to interlock:
two plug-in devices
b
a Compact NSX100-250 with an NSX400-630.
b
Connection to the downstream installation can be made easier using a coupling
accessory (see next page).
DB112198
Interlocking of two or three toggle-controlled devices.
DB112194
ON
I
OFF O
tripped
tripped
ON
I
OFF O
reset
reset
Interlocking of two devices with rotary handles.
DB112195
Interlocking with keylocks.
DB112196
Interlocking on a base plate.
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version: 1.0