The Chint NR2-2.50is a Thermal Overload Relay which is used in conjunction with the NC1 Chint AC Coil Contactors.
The NC1 Thermal Overload Relays mount directly onto the bottom of the NC1 AC Coil Contactors providing overload protection.
Technical Specifications of the NR2-2.50 are:
Adjustable current ratings
1.60A - 2.50A
Frame NR2-25