TM-D Thermal-Magnetic Trip Unit for 1P and 2P Circuit Breakers
Introduction
The TM-D thermal-magnetic trip unit for 1P/2P circuit breakers up to 160 A are built-in trip units.
They are designed for AC and DC general-purpose applications.
The TM-D built-in 1P/2P 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) |
16 |
20 |
25 |
32 |
40 |
50 |
63 |
80 |
100 |
125 |
160 |
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Fixed Pickup Ir (A) at 40 °C (104 °F) |
16 |
20 |
25 |
32 |
40 |
50 |
63 |
80 |
100 |
125 |
160 |
Setting the Magnetic Protection
The magnetic protection pickup cannot be adjusted and equals the value shown below:
|
Trip unit rating In (A) |
16 |
20 |
25 |
32 |
40 |
50 |
63 |
80 |
100 |
125 |
160 |
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Fixed pickup Ii (A) +/– 20% |
DC value |
260 |
260 |
400 |
400 |
700 |
700 |
700 |
800 |
1,000 |
1,200 |
1,250 |