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Internal Accessories
Und ervolta g e Release (UVR) Solenoid
CAUTION: Do not attempt to install an accessory with
the breaker "Closed" or "Charged". Make certain
breaker is "Open" and " Discharged" as shown above.
Personal injury or mechanical damage may occur.
Preliminary installation procedures are outlined on
pages 35-36.
Undervoltage Release Kit
Undervoltage Release
The undervoltage release (UVR) trips the SB breaker in
accordance with the pick-up and dropout requirements of
UL-489. The monitored voltage i s normally the voltage on
the line side of the breaker. Available UVR coil ratings are
1 20, 240, 480, or600V ac or 1 2, 24, 48, or 1 25V de. The UVR
will instantaneously (no intentional delay) trip the breaker
when the voltage drops below the trip value. Tripping can
be delayed up to 0.5 seconds by using the external time
delay undervoltage accessory with the UVR.
The UVR accessory kit consists of a trip solenoid to trip the
breaker, mounting hardware, and i nternal wiring . The trip
solenoid is installed on the right side of the front compart
ment, behind the trip unit and beneath the reset plate.
Notes:
I .
Wire markings are shown in brackets <like this> .
2. L T indicates left-top terminal block or secondary
connector.
If practical, the UVR should be installed prior to the SB
breaker being installed in the switchboard . Before starting
the installation, the breaker should be in the open position
and the stored energy mechanism should be discharged.
A drawout constructed breaker, already installed in the
switchboard, should be placed in thefullywithdrawn position
to allow access to the secondary disconnects. If being
installed in a drawout breaker, use access-hole in right side
mechanism assembly.
To install the undervoltage release, first remove the SB
breaker front cover and trip unit, if previously installed (see
page 37).
Place UVR solenoid beneath breaker reset plate.
2.) Install UVR on top right side of reset mechanism.
1 .)
Route the UVR solenoid wire leads across the back of the
stored energy mechanism, located between the wire shield
3 . )
and the mid-barrier to the left side of the breaker.
51
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