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Thermal-magnetic trip units

Derating

Thermal-magnetic trip units employ a temperature-dependent bimetal to provide overload protection. The setting values are calibrated at an ambient temperature of +50 °C. Compensation factors must be applied for ambient temperatures other than +50 °C.

You will find more information and derating factors in chapter Derating and temperature compensation.

Thermal-magnetic trip unit TM210 LI

63892956683.png

Line protection FTFM - function LI

The thermal-magnetic trip unit TM210 has:

  • fixed parameter setting Ir for overload protection (L)

  • fixed parameter setting Ii for instantaneous short-circuit protection (I)

  • With 4-pole versions only: Neutral conductor (N) protection permanently set to 0%, 50% or 100% Ir depending on version

Parameter TM210:

Thermal-magnetic trip unit TM220 LI

63893614219.png

Line protection ATFM - function LI

The thermal-magnetic trip unit TM220 has:

  • adjustable parameter setting Ir for overload protection (L)

  • fixed parameter setting Ii for instantaneous short-circuit protection (I)

  • With 4-pole versions only: Neutral conductor (N) protection permanently set to 0%, 50% or 100% Ir depending on version

Parameter TM220:

Thermal-magnetic trip unit TM240 LI

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Line protection ATAM - function LI

The thermal-magnetic trip unit TM240 has:

  • adjustable parameter setting Ir for overload protection (L)

  • adjustable parameter setting Ii for instantaneous short-circuit protection (I)

  • With 4-pole versions only: Neutral conductor (N) protection permanently set to 0%, 50% or 100% Ir depending on version

Parameter TM240:

1)

With 4-pole versions only:

63891137163_Table-1.png
63891137163_Table-2.png

1)

With 4-pole versions only:

63892089355_Table-1.png
63892089355_Table-2.png

1)

With 4-pole versions only:

63892554891_Table-1.png
63892554891_Table-2.png