20 WL Circuit Breaker Selection and Application Guide
1
See page 85 for field install part numbers.
Arc chute cover
The arc chute cover is available for isolating enclosure material
or parts located above the circuit breaker where heat and
exhaust gases may exit from the breakers arc chutes. Arc chute
covers are not available for fixed mounted breakers and limited
to select draw-out breaker types.
TOC (Truck Operated Contacts)
For draw-out breaker applications a TOC device is available to
provide remote indication of the circuit breakers primary and
secondary contact connections (racking positions). When
the breaker is racked into a connected, test or disconnected
position, it activates TOC switches for external user circuits.
WL Circuit Breaker
Cradle Factory Installed Options
1
MOC (Mechanism Operated Contacts)
Mechanism Operated Contacts (MOC) are a cradle mounted
accessory which indicate the state of the breaker’s internal
contacts (open or closed). MOCs are typically utilized when
additional auxiliary contacts are necessary – above and beyond
the number configurable in the circuit breaker – although they
may also be used in lieu of the internal auxiliary switches. Each
MOC assembly includes 4 ‘
a
’ and 4 ‘
b
’ contacts. Two different MOC
assemblies are available. One version operates when the circuit
breaker is in both the “TEST” and “CONNECTED” positions, and
the other version operates only when the circuit breaker is in the
“CONNECTED” position.
Note per ANSI C37.100:
‘
a
’ contact: a contact that is open when the main device is in the
standard reference position and that is closed when the device is
in the opposite position.
‘
b
’ contact: a contact that is closed when the main device is in
the standard reference position and that is open when the device
is in the opposite position.
Characteristics table
MOC contact configurations 4NO and 4NC
AC operation Voltage 240VAC 50/60Hz
Continuous current 10A
Making current 30A
Breaking current 3A
DC operation Voltage 24, 125, 250VDC
Making current 1.1A @ 125VDC,
.55A @250VDC
Breaking current 1.1A @ 125VDC,
.55A @250VDC
TOC Switch Breaker disconnected = primary Breaker in test = primary Breaker connected = primary
and secondary contacts contacts disconnected and and secondary contacts
are disconnected secondary contacts connected are connected
Option 1 1 form C contacts 1 form C contacts 1 form C contacts
Option 2 1 form C contacts 2 form C contacts 3 form C contacts
Option 3 0 form C contacts 0 form C contacts 6 form C contacts
AC voltage 120, 240VAC
AC continuous current 10A
TOC Contact Ratings AC making/breaking current 6A@120V, 3A@240VAC
DC voltage 24, 48, 125, 250VDC
DC continuous current 6A, 1A, 1A
DC making/breaking current 6A, 0.22A, 0.11A
Courtesy of NationalSwitchgear.com
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