Effective May 2010
2C15998H02
05/10 AWA1230-2443
Undervoltage release in
IZM low voltage circuit breakers
warning
(1) Only qualified electrical persOnnel shOuld
be permitted tO wOrk On the equipment.
(2) always de-energize primary and
secOndary circuits if a circuit breaker
cannOt be remOved tO a safe wOrk lOcatiOn.
(3) drawOut circuit breakers shOuld be
levered (racked) Out tO the discOnnect
pOsitiOn.
(4) all circuit breakers shOuld be switched
tO the Off pOsitiOn and mechanism springs
discharged.
failure tO fOllOw these steps fOr all
prOcedures described in this instructiOn
leaflet cOuld result in death, bOdily injury,
Or prOperty damage.
warning
the instructiOns cOntained in this awa and On
prOduct labels have tO be fOllOwed. Observe
the five safety rules:
– discOnnecting
– ensure that devices cannOt be
accidentally restarted
– verify isOlatiOn frOm the supply
– earthing and shOrt-circuiting
– cOvering Or prOviding barriers tO
adjacent live parts
discOnnect the equipment frOm the supply.
use Only authOrized spare parts in the repair
Of the equipment. the specified maintenance
intervals as well as the instructiOns fOr
repair and exchange must be strictly adhered
tO prevent injury tO persOnnel and damage tO
the switchbOard.
Section 1: General information
The undervoltage release (UVR) opens the circuit
breaker when its supply voltage falls to between
35–60% of rated voltage. If the release is not
energized to 85% of its supply voltage, the circuit
breaker cannot be closed electrically or manually.
Section 2: Installation of UVR
To install the UVR, proceed with the following
six steps:
Step 1:
Remove the front cover by unscrewing
the hex-head captive bolts (four for three-pole,
six for four-pole) that join the cover to the breaker
housing using a 10 mm 1/4-inch drive socket.
Then hold the charge handle down approximately
45 degrees to pull off the cover.
Step 2:
Place the appropriate label on the
front cover nameplate space located under
“Accessories.”
Figure 1. Steps 1 and 2
Label
Bolt
