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