TM-D Thermal-Magnetic Trip Unit for 1P Circuit Breakers 250 A
Introduction
TM-D thermal-magnetic trip units for 1P circuit breakers 250 A are built-in trip units.
They are designed for AC applications.
TM-D built-in 1P trip units provide:
-
fixed thermal threshold
-
fixed magnetic pickup
Setting the Thermal Protection
The thermal protection pickup Ir cannot be adjusted and equals the value shown below:
|
Trip unit rating In (A) at 40 °C (104 °F) |
160 |
200 |
250 |
|---|---|---|---|
|
Fixed pickup Ir (A) at 40 °C (104 °F) |
160 |
200 |
250 |
Setting the Magnetic Protection
The magnetic protection pickup Ii cannot be adjusted and equals the value shown below:
|
Trip unit rating In (A) |
160 |
200 |
250 |
|---|---|---|---|
|
Fixed pickup Ii (A) +/– 20% |
850 |
850 |
850 |