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Description of device
43
09/15 MN03407005Z-DE/EN
Figure 6:
Wiring of the overload relay for the protection of AC
or DC motors (bimetallic release switched in series)
(
a
Section "Tripping characteristics" as of Page 65)
Re-closing
After tripping, the bimetallic releases must first cool down
before the overload relay can be reset. Manual and auto-
matic reset can be selected by means of a selector switch
(
In auto mode, the contacts automatically fall back after the
bimetallic releases have cooled down, whereas in manual
mode the tripping must be acknowledged locally on the
overload relay.
h
When a ZB…/XTOB… overload relay is to be used for
monitoring an AC or DC motor, the current must flow
across all three current paths in order to avoid early
tripping.
j
Danger!
To ensure explosion-proof operation, the overload relay
may only be reset/switched on manually, or automatically
via a control interlock circuit for the motor or electrical
machinery, after the bimetallic release has cooled down.
Resets may be carried out at the installation or by trained
personnel in the control room.
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