NYKR2 Series

Thermal Overload Relay

（25-630A）

Concise Efficient Safe Comprehensive

PRODUCT OVERVIEW

NYKR2 series thermal overload relay is a protection device used to protect motors, and its main function is to detect whether the current of the motor exceeds the rated value during operation. Its working principle is trigger the protection based on the heat generated by the current through its control circuit. When there is an overload, it controls the switching devices to protect the line against overload. The thermal relay can effectively protect the motor from damage under abnormal conditions and prolong the service life of the motor. It’s widely used in industry and other fields, it can realize intelligent control and management.

PRODUCT CHARACTERISTICS

Simple and reliable

Thermal relay has simple structure and it utilizes mechanical action based on the principle of physical thermal expansion, which makes them very reliable with a low fault rate.

Cost effective

Compared with other types of protective devices, thermal relays have lower cost and are easy to install and maintain, which are suitable for applications at all scales.

Automatic reset function

Most thermal relays can be automatically reset when they cool down to normal temperature after triggering the protective device and being powered off, which is conducive to continuous operation and reduces downtime.

Time delay

Thermal relays have an inherent feature of time delay that allows them to wait for a motor to overload in a short period of time, which is useful in avoiding unnecessary and frequent tripping.

Selective protection

By appropriately setting the thermal relay, it is possible to respond to a specific current, enhancing the overall protection strategy of the system.

Environmental adaptability

Thermal relays are not susceptible to external electromagnetic interference, and its performance enables relatively stable operation under various environmental conditions.

Technical parameters

Model NYKR2-F25 NYKR2-F36 NYKR2-F95 NYKR2-F150 NYKR2-F220 NYKR2-F630
Current rating 25 36 95 150 220 630
Rated insulation voltage 690V 690V 690V 690V 690V 690V
Phase failure protection ● ● ● ● ● ●
Manual and automatic reset ● ● ● ● ● ●
Temperature compensation ● ● ● ● ● ●
Tripping indication ● ● ● ● ● ●
Test button ● ● ● ● ● ●
Stop button ● ● ● ● ● ●
Installation method Plug-in or free-standing Plug-in or free-standing Plug-in or free-standing Plug-in or free-standing Free-standing Free-standing
Auxiliary contact 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC 1NO+1NC
Auxiliary circuit AC-15 220V Rated currentA 2.72 2.72 2.72 2.72 2.72 2.72
AC-15 380V Rated currentA 1.58 1.58 1.58 1.58 1.58 1.58
DC-13 220V Rated currentA 0.2 0.2 0.2 0.2 0.2 0.2
Selection table

NYKR2 F25 Additional features
Product code Casing grade Additional features
NYKR2：
Thermal Overload Relay 		F25
F36
F95
F150
F220
F630		 Independent mounting base

Note: NYKR2-F220, NYKR2-F630 are electronic thermal overload relays, the body adopts free-standing mode without mounting base.
NYKR2-F150 mounting base (free-standing) is independently guide rail mounted with NYKR2-F150 body, NYKR2-F150 mounting base (combined) is mounted in combination with NYKR2-F150 body, and can be directly connected with NYKC2-115, NYKC2-150 AC contactors.

Technical Parameters


NYKR2 SeriesThermal Overload Relay

  • Current rating：25

    Rated insulation voltage ：690V

    Phase failure protection：Standard configuration

    Manual and automatic reset：Standard configuration

    Temperature compensation：Standard configuration

    Tripping indication：Standard configuration

    Test button：Standard configuration

    Stop button：Standard configuration

    Installation method：Plug-in or free-standing

    Auxiliary contact：1NO+1NC

    Auxiliary circuitAC-15 220V Rated current：2.72A

    Auxiliary circuitAC-15 380V Rated current：1.58A

    Auxiliary circuitDC-13 220V Rated current：0.2A

  • Current rating：36

    Rated insulation voltage ：690V

    Phase failure protection：Standard configuration

    Manual and automatic reset：Standard configuration

    Temperature compensation：Standard configuration

    Tripping indication：Standard configuration

    Test button：Standard configuration

    Stop button：Standard configuration

    Installation method：Plug-in or free-standing

    Auxiliary contact：1NO+1NC

    Auxiliary circuitAC-15 220V Rated current：2.72A

    Auxiliary circuitAC-15 380V Rated current：1.58A

    Auxiliary circuitDC-13 220V Rated current：0.2A

  • Current rating：95

    Rated insulation voltage ：690V

    Phase failure protection：Standard configuration

    Manual and automatic reset：Standard configuration

    Temperature compensation：Standard configuration

    Tripping indication：Standard configuration

    Test button：Standard configuration

    Stop button：Standard configuration

    Installation method：Plug-in or free-standing

    Auxiliary contact：1NO+1NC

    Auxiliary circuitAC-15 220V Rated current：2.72A

    Auxiliary circuitAC-15 380V Rated current：1.58A

    Auxiliary circuitDC-13 220V Rated current：0.2A

  • Current rating：150

    Rated insulation voltage ：690V

    Phase failure protection：Standard configuration

    Manual and automatic reset：Standard configuration

    Temperature compensation：Standard configuration

    Tripping indication：Standard configuration

    Test button：Standard configuration

    Stop button：Standard configuration

    Installation method：Plug-in or free-standing

    Auxiliary contact：1NO+1NC

    Auxiliary circuitAC-15 220V Rated current：2.72A

    Auxiliary circuitAC-15 380V Rated current：1.58A

    Auxiliary circuitDC-13 220V Rated current：0.2A

  • Current rating：220

    Rated insulation voltage ：690V

    Phase failure protection：Standard configuration

    Manual and automatic reset：Standard configuration

    Temperature compensation：Standard configuration

    Tripping indication：Standard configuration

    Test button：Standard configuration

    Stop button：Standard configuration

    Installation method：Plug-in or free-standing

    Auxiliary contact：1NO+1NC

    Auxiliary circuitAC-15 220V Rated current：2.72A

    Auxiliary circuitAC-15 380V Rated current：1.58A

    Auxiliary circuitDC-13 220V Rated current：0.2A

  • Current rating：630

    Rated insulation voltage ：690V

    Phase failure protection：Standard configuration

    Manual and automatic reset：Standard configuration

    Temperature compensation：Standard configuration

    Tripping indication：Standard configuration

    Test button：Standard configuration

    Stop button：Standard configuration

    Installation method：Plug-in or free-standing

    Auxiliary contact：1NO+1NC

    Auxiliary circuitAC-15 220V Rated current：2.72A

    Auxiliary circuitAC-15 380V Rated current：1.58A

    Auxiliary circuitDC-13 220V Rated current：0.2A

Selection table


  • Product code ：NYKR2:Thermal Overload Relay

    Casing grade：F25、F36、F95、F150、F220、F630

    Additional features：Independent mounting base

Note: NYKR2-F220, NYKR2-F630 are electronic thermal overload relays, the body adopts free-standing mode without mounting base.
NYKR2-F150 mounting base (free-standing) is independently guide rail mounted with NYKR2-F150 body, NYKR2-F150 mounting base (combined) is mounted in combination with NYKR2-F150 body, and can be directly connected with NYKC2-115, NYKC2-150 AC contactors.