BuyLog Flippingbook MAR 2024

MOLDED CASE CIRCUIT BREAKERS, BUYLOG SECTION 6

6-22

— Current Limiting

Existing UL circuit breakers Tmax XT2, XT4 and XT5 have undergone specific tests as per the UL 489. Standard in order to be classified as UL current limiting circuit breakers. They have specific characteristics in terms of limiting peak current and specific let-through energy.

According to the UL 489 Standard, current limiting circuit breakers will be marked “Current Limiting” on the front and will have a label on the right side specifying the peak current and specific let-through energy values. Accessories and trip are the same as available for standard UL Tmax MCCBs.

Circuit breaker

XT2

XT4

XT5

Trip Units

TMF, TMA, Ekip

TMF, TMA, Ekip

TMF, TMA, Ekip

Up to 250A 2 Up to 600V

Up to 600A Up to 600V

In

Up to 125A 1 Up to 600V

Voltage

Breaking Capacity

H

L

V

H

L

V

H

L

V

1 Includes TMF, TMA with In = 15-125A and Ekip with In= 10, 25, 60, 100, 125A 2 Includes TMF, TMA with In = 25-250A and Ekip with In= 40, 60, 100, 150, 225, 250A