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XV
= Delivery terminal box for the auxiliary circuits of the fixed circuit-breaker
YC
= Shunt closing release
YO
= Shunt opening release
YO2
= Second shunt opening release (see note Q)
YR
= Coil to electrically reset the circuit-breaker
YU
= Undervoltage release (see notes B and Q)
14.2. Description of figures
Fig. 1
= Motor circuit to load the closing springs.
Fig. 2
= Circuit of shunt closing release.
Fig. 4
= Shunt opening release.
Fig. 6
= Instantaneous undervoltage release (see notes B and Q).
Fig. 7
= Undervoltage release with electronic time-delay device, outside the circuit-breaker (see notes B and Q)
Fig. 8
= Second shunt opening release (see note Q).
Fig. 11
= Contact for electrical signalling of springs loaded.
Fig. 12
= Contact for electrical signalling of undervoltage release energized (see notes B and S).
Fig. 13
= Contact for electrical signalling of circuit-breaker open due to tripping of the overcurrent release. The circuit-
breaker may be closed only after pressing the reset pushbutton.
Fig. 14
= Contact for electrical signalling of circuit-breaker open due to tripping of the overcurrent release and electrical
reset coil. The circuit-breaker may be closed only after pressing the reset pushbutton or energizing the coil.
Fig. 21
= First set of circuit-breaker auxiliary contacts.
Fig. 22
= Second set of circuit-breaker auxiliary contacts (not available for PR122/P and PR123/P releases)(see note V)
Fig. 23
= Third set of supplementary auxiliary contacts outside the circuit-breaker.
Fig. 31
= First set of contacts for electrical signalling of circuit-breaker in connected, test isolated, disconnected position.
Fig.32
= Second set of contacts for electrical signalling of circuit-breaker in connected, test isolated, disconnected
position.
Fig. 42
= Auxiliary circuits of PR122/VF releases (see notes F and V).
Fig. 45
= Circuits of the communication module PR120/D-M of the PR122/VF releases (optional) (see note E).
Fig. 46
= Circuits of the indicator module PR120/K of the PR122/VF releases - connection 1 (optional)
(see note V).
Fig. 47
= Circuits of the indicator module PR120/K of the PR122/VF releases - connection 2 (optional)
(see note V).
Fig. 61
= SACE SOR TEST UNIT Test/monitoring Unit (see note R)
14.3. Incompatibilities
The circuits indicated in the following figures cannot be supplied simultaneously on the same circuit-breaker:
6 - 7 - 8
13 - 14
22 - 46 - 47
14.4. Notes
A) The circuit-breaker is only fitted with the accessories specified in the ABB SACE order acknowledgement. Consult the tech-
nical catalogue for information on how to make out an order.
B) The undervoltage release is supplied for operation using a power supply branched on the supply side of the circuit-breaker
or from an independent source. The circuit-breaker can only close when the release is energized (there is a mechanical lock
on closing).
If the same power supply is used for the closing and undervoltage releases and the circuit-breaker is required to close au-
tomatically when the auxiliary power supply comes back on, a 30 ms delay must be introduced between the undervoltage
release accept signal and the energizing of the closing release. This m ay be achieved using an external circuit comprising a
permanent make contact, the contact shown in fig. 12 and a time-delay relay.
E) For connecting the EIA RS485 serial line, see "Technical Application papers – QT 9" communication via BUS with the ABB
switches.
F) The PR122/VF trip unit requires the external power supply to activate the protection functions and the ammeter.
Without the auxiliary power supply 24V DC the trip unit does not work and the circuit breaker is not protected.
It is recommended to use a backup battery to guarantee the presence of the Vaux or to add in the circuit breaker an
undervoltage release (YU) to open the circuit breaker even when the auxiliary Vaux does not work.
The external auxiliary power supply must be provided using a galvanically-separated power pack
dedicated only for one trip unit. Since the auxiliary voltage needs to be isolated from the ground,
"galvanically separed converters" in accordance with the IEC standard 60950 (UL 1950) or the equivalent IEC 60364-41
have to be used to guarantee a current in common mode or leakage current (as defined in IEC 478/1) no greater than 3,5 mA.
The connections for the auxiliary power supply must be made with a two-pole shielded twisted cable
(e.g. type BELDEN 3105A/3105B), the shield must be earthed on the trip unit side.
P) With releases PR122/VF with communication module PR120/D-M, the coils YO and YC are controlled directly from contacts
K51/YO and K51/YC with maximum voltages of 110-120 VDC and 240-250 VAC.
Q) The second shunt opening release may be installed as an alternative to the undervoltage release.
B2342
Model
Apparatus
Emax VF
1SDH000909R0001
Doc. no.
Scale
Page No
58/66
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