JR28-25 Series

JR28-25 Series

JR28 Series — Thermal Overload Relay

Professional Definition

The JR28 Series Thermal Overload Relays are motor protection devices designed to provide reliable protection against overload and phase failure conditions in AC motor starter circuits. Installed in conjunction with AC contactors, they utilize bi-metal thermal elements to detect sustained overcurrent and disconnect the motor circuit to prevent overheating and damage.

The JR28 series complies with IEC 60947-4-1 standards and is widely used in industrial motor control panels, pump systems, compressors, and machinery automation.

Series Classification Table

Series Model Current Range (A) Matching Contactor Application Scope
JR28-25 0.1 – 25 A CJX2-09 to CJX2-25 Small motors
JR28-36 0.1 – 36 A CJX2-09 to CJX2-32 Medium motors
JR28-93 23 – 93 A CJX2-40 to CJX2-95 Large motors

Electrical Specifications (General)

Parameter Value
Rated Insulation Voltage (Ui) 690 V
Rated Operational Voltage (Ue) 500 V
Rated Frequency 50 / 60 Hz
Poles 3P
Tripping Class Class 10A
Mounting Direct-mount to contactor
Reset Mode Manual / Auto selectable
Auxiliary Contacts 1NO + 1NC
Protection Overload & Phase Failure

Adjustable Current Ranges

JR28-25

Model Adjustable Range (A)
JR28-25 0.1 – 0.16
JR28-25 0.16 – 0.25
JR28-25 0.25 – 0.4
JR28-25 0.4 – 0.63
JR28-25 0.63 – 1
JR28-25 1 – 1.6
JR28-25 1.6 – 2.5
JR28-25 2.5 – 4
JR28-25 4 – 6
JR28-25 5.5 – 8
JR28-25 7 – 10
JR28-25 9 – 13
JR28-25 12 – 18
JR28-25 17 – 25

JR28-36

Model Adjustable Range (A)
JR28-36 0.1 – 0.16
JR28-36 0.16 – 0.25
JR28-36 0.25 – 0.4
JR28-36 0.4 – 0.63
JR28-36 0.63 – 1
JR28-36 1 – 1.6
JR28-36 1.6 – 2.5
JR28-36 2.5 – 4
JR28-36 4 – 6
JR28-36 5.5 – 8
JR28-36 7 – 10
JR28-36 9 – 13
JR28-36 12 – 18
JR28-36 17 – 25
JR28-36 23 – 32
JR28-36 30 – 36

JR28-93

Model Adjustable Range (A)
JR28-93 23 – 32
JR28-93 30 – 40
JR28-93 37 – 50
JR28-93 48 – 65
JR28-93 55 – 70
JR28-93 63 – 80
JR28-93 80 – 93

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