Modular units

DE53568
DE53569
DE53570
DE53571
DE59203
Characteristics of
the functional units
A3 type
A4 type
A5 type
50 type
Type 52
O
AMTED398078EN.indd
O O
O
O
O
O
O
S
O
O
O
O
S
MT20240EN
Interlocks
Ring units
Aim:
b to prevent the closing of the earthing switch of a load-side cubicle
unless the line-side switch is locked “open”.
b to prevent the simultaneous closing of two switches.
b to prevent the closing of the earthing switch of the casing unit unless
the downstream and the upstream switches are locked in the “open” position.
Prevents
b on-load switching of the disconnectors.
Allows
b off-load operation of the circuit breaker with the disconnectors open (double isolation).
b off-load operation of the circuit breaker with the disconnector open (single isolation).
Prevents
b on-load switching of the disconnectors.
Allows
b off-load operation of the contactor with the disconnectors open (double isolation).
b off-load operation of the contactor with the disconnector open (single isolation).
Legend for key-type interlocks:
no key free key captive key panel or door
81