BuyLog Flippingbook MAR 2024
MOLDED CASE CIRCUIT BREAKERS, BUYLOG SECTION 6
6-24
— Circuit breakers for motor protection Main characteristics
When choosing and manufacturing a system for starting and monitoring motors, safety and reliability are important considerations. Motor starting is a particularly critical phase for the motor itself and for the installation powering it. Every rated service needs to be adequately monitored and protected in order to deal with any faults that might occur. When it comes to direct starting, ABB SACE offers two different solutions: • a conventional system equipped with a circuit breaker with a magnetic only trip unit for protection against short circuits, a thermal trip unit for protection against overloads and phase failure or unbalance, and a contactor to operate the motor; • an advanced protection system which integrates all the protection and monitoring functions in the circuit breaker itself and a contactor for operating the motor.
Motor protection
XT1 125
XT2
XT3 225
XT4 250
Frame size
[A]
125
Poles
[No.]
3
3
3
3
600 500
480 V Δ 1
600 600
(AC) 50-60Hz [V] 480 V Δ (1)
Rated service voltage
(DC) [V]
500
500
Versions
Fixed, Plug-in Fixed, Plug-in, Withdrawable Fixed, Plug-in Fixed, Plug-in, Withdrawable
Rating level
H
H
L
V
S
H L
V
X
Trip units for motor protection
–
–
–
– –
–
–
–
– –
– –
MA (MCP)
Ekip M Dip I (MCP)
– – –
– – –
Ekip M Dip LIU (MPCB)
Ekip M Touch LRIU (MPCB)
1 600Y/347
Made with FlippingBook Ebook Creator