12
Molded Case Circuit Breakers
BW0 series
Internal accessories
Internal accessories 32AF
Auxiliary switch and alarm switch
These devices indicate the MCCBs operation status
electrically. Auxiliary switch (W) indicates the ON/OFF status
of MCCB.Alarm switch (K) indicates the trip status of MCCB.
An MCCB trips when an overload occurs or a short-circuit
current flows through the MCCB. Both the auxiliary switch and
alarm switch can be installed on the left side of MCCB body.
Shunt trip device
Shunt trip (F) is a device that issues an electrical signal to trip
the MCCB. The MCCB when the main circuit voltage drops
lower than the specified value. Shunt trip trip device can be
installed on the right side of MCCB body.
Operation of auxiliary switches(W) and alarm switches(K)
11
14
12
91
94
92
11
14
12
91
94
92
ON
OFF
Trip
Handle position
Accessory
Auxiliary switch (W)
Alarm switch (K)
Type number nomenclature
Available configurations
Specifications
Type
Contact capacity Wire size
Input
W, K
125VAC 3A
30VDC 2A
AWG24
–
F
–
AWG24
150VA
BW32A0-030 W K FA A
MCCB type
See page 6
Accessories
Terminal block
A : with terminal block
Shunt trip device *1
FA : 100VAC to 120VAC
FK : 200VAC to 240VAC
FD : 100VDC
Alarm switch *2
K : 1c / alarm switch
Auxiliary switch *2
W : 1c / auxiliary switch
Notes
*1 A shunt trip device can be added only to 3-pole models.
*2 Only one of the following can be added to a 2-pole model:
alarm switch or auxiliary switch.
Pole
2
3
W
K
F
Auxiliary switch :
Alarm switch :
Shunt trip device :
W + K
W + F
K + F
W + K + F
BW32A0
Type
BW33A0
Note: Terminal block is installed on the same side of the accessory.
3-pole
Handle
Right
Left
2-pole
Handle
Left
Shunt trip: F
Auxiliary switch: W
Alarm switch: K
Lead wire
Lead wire type
Terminal block type
Summary of Contents for BW0 Series
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