This Schneider Electric TM250D is a 4 poles 4d thermal-magnetic trip unit used on Compact NSX 250 circuit breakers. This 250A rating thermal-magnetic trip unit is an optimum choice for all distribution applications. It embeds an adjustable thermal overload protection and a fixed magnetic protection against short-circuits.

Ambient air temperature for operation -25 to 70 °C
Ambient air temperature for storage -50 to 85 °C