HUW1
Series Intelligent Universal Circuit Breaker
42
10
Circuit Breaker Installation Operation
10.1
Proper placement after unpacking
●
Place the box correctly according to the instruction of the packing box, and screw out the self-tapping screw
at the lower terminal of the outer box to remove the box.
●
The circuit breaker can be removed after the bolt fixing the circuit breaker is screwed out. For the circuit
breaker fixed in the drawer seat, the main body of the circuit breaker shall be moved out of the drawer seat
through cranking, and then the bolt for fixing the drawer seat can be screwed out to remove the drawer seat.
●
The removed circuit breaker shall be placed correctly as shown in the figure to avoid damaging the circuit
breaker.
Wrong placement
Correct placement
10.2
Circuit breaker pre-installation inspection
● Check whether the parameters on the label of the circuit breaker are consistent with the good ordered.
● Before installation, it shall be confirmed that the control power supply voltage is consistent with the circuit
breaker accessory voltage.
● Before installing the circuit breaker, check the insulation resistance of the circuit breaker with a 1,000 V
megger, which shall not be less than 20
μΩ when the ambient temperature is 20°C±5°C and the relative
humidity is 50%-70%. Otherwise, it shall be dried to make the insulation resistance meet the requirements
before use.
The test locations of the insulation resistance are between phases as well as between phases and frames when
the circuit breaker is closed; and between the incoming and outgoing lines of each phase when the circuit breaker is
disconnected.
10.3
Installation of circuit breaker
● Mode I for the installation of the drawer circuit breaker: Move the circuit breaker body out of the drawer seat
through cranking, install the inner bottom plate of the drawer seat (inner installation size) on the guide rail of
the distribution cabinet, and fasten it with four M10 bolts and gaskets with tightening torque of (15
– 20) N.m
or (30
– 36) N.m.
● Mode II for the installation of the drawer circuit breaker: Instead of moving the circuit breaker body out of the
drawer seat, directly install the supports (external installation size) on both sides of the circuit breaker on the
guide rail of the distribution cabinet, and fasten them with four M10 bolts and gaskets with tightening torque of
(15
– 20) N.m or (30 – 36) N.m.
● The installation of the fixed circuit breaker is the same as the installation mode II of the drawer circuit breaker.
10.4
Busbar installation and wiring of circuit breaker
● When installing the circuit breaker, sufficient space shall be provided to ensure good air circulation. The
spacer between the upper and lower terminals of the circuit breaker must be made of non-magnetic materials
to avoid the formation of the magnetic circuit that will affect the use of the product.
● The pivot shall be fixed on the distribution cabinet rack to ensure that the terminal of the circuit breaker shall
not bear the weight of the external busbar of the user (this support shall be installed near the terminal).
Cable connection method
The cable connection shall ensure that there is no excessive mechanical force on the circuit breaker terminals.
Users can use the cable connection busbar to extend the terminal of the circuit breaker. The cable can be a
single-core cable or a multi-core cable. When wiring, it can usually be connected to the busbar according to the
following rules: (1) Position the cable lug before inserting the bolt; (2) The cable shall be firmly fixed on the rack of the
distribution cabinet.
Wiring method of secondary circuit
The terminal of secondary circuit of circuit breaker adopts screw connection, which is suitable for connecting the
single-core or multi-core copper wire with insulating layer, and the cross-sectional area of the wire is 0.5
– 1.5 mm
2
.
Before connection, the insulation layer of the wire connection terminal shall be removed with a length of about 6 mm.
Screw out the secondary circuit screw by about 2 to 3 mm with a special screwdriver, and then insert the wire and
tighten it with a screwdriver. The same terminal of the secondary circuit can insert two wires side by side at the same
time on both sides of the screw. The wiring mode is shown in the figure below.
