2
20A motor start-up unit
Protection and operation are guaranteed by circuit-
breaker XT2 MA In20A 3p in conjunction with the
thermal relay and contactor.
200A motor start-up unit
Protection and operation are guaranteed by circuit-
breaker XT4 Ekip M-LRIU In200A 3p in conjunction
with the contactor.
12 SACE Tmax Moulded-case circuit-breakers | ABB ABB | SACE Tmax Moulded-case circuit-breakers 13
1
2
3
4
4
4
3
3
3
1
3
3
A single family of moulded-case circuit-breakers up to 3200 A
Motor protection solutions
T8 2000A 3 poles with PR332 LSIG
General circuit-breaker used for protecting the load side
circuit-breakers dedicated to motor protection.
T8 800A 3 poles with PR221-1
Circuit-breaker used for motor protection in conjunction with
a thermal relay and a contactor. Instantaneous short-circuit
protection (I) can be adjusted from 1 to 10xIn.
XT4 250A 3 poles with Ekip M-LRIU
Circuit-breaker used for integrated motor protection.
Ekip M-LRIU is fitted with the following protections:
• against overload (L): threshold adjustable from 0.4...1xIn.
The tripping time is established by choosing the tripping
class defined by standard IEC 60947-4-1.
• rotor locking (R): with threshold adjustable in OFF or from
3...9x I1, with adjustable tripping time;
• against instantaneous short-circuit (I): with threshold
adjustable from 6...13xIn and instantaneous tripping time;
• against phase imbalance (U): with threshold adjustable
in ON or OFF.
XT2 160A 3 poles with MA
Circuit-breaker used for motor protection in conjunction with
a thermal relay and a contactor. Instantaneous short-circuit
protection (I) can be adjusted from 6...14xIn.
Start-up is a particularly critical phase for the motor itself and for the installation powering it.
Even rated service needs to be adequately monitored and protected in order to respond to
any faults that might occur.
When it comes to direct starting, ABB SACE proposes two different solutions:
n a conventional system with three poles circuit-breaker equipped with a magnetic only trip
unit for protection against short-circuits, a.thermal relay for protection against overloads
and phase failure or imbalance, and a contactor to operate the motor;
n an advanced protection system which integrates all the protection and monitoring functions,
and a contactor for operating the motor, in the circuit-breaker itself.
Releases
Frame [A]
160 200 400 630 800 1000 1600
MF-MA (Magnetic only trip unit) Tmax XT2-XT3-XT4
I (Basic Magnetic only trip unit) Tmax XT2-XT4-T5-T6-T7-T8
LIU (Advanced Magnetic only trip unit) Tmax XT2-XT4
LRIU (Advanced Magnetic only trip unit) Tmax XT2 – XT4 – T5 – T6
Circuit-breakers for motor protection
Coordination tables
Suitable devices for protection and motor operation can be identified, given the type of starting, the electrical characteris-
tics of the installation and the characteristics of the motor.
Motor MCCB Contactor Thermal relay
Rated
power
Rated
current
Type Magnetic protection
setting
Type Type Setting
range
I max
Pe Ie [A] min [A] max [A] [A]
5.50 11.50 XT2S 160 MF 12.5 175 AF38 EF19-18.9 5.70 18.90 12.50
7.50 15.50 XT2S 160 MA 20 240 AF38 EF19-18.9 5.70 18.90 18.90
9.00 18.60 XT2S 160 MA 20 280 A50 EF45-30 9 30 20
11.00 22.00 XT2S 160 MA 32 320 A50 EF45-30 9 30 30
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