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Product Overview

JR29 (T) Thermal Relay Switch (hereinafter referred to as thermal relay) is suitable AC electric power system with AC 50Hz, voltage to 660V, current of 0.1-500A. It is generally used for the protection of overload and phase failure of general AC motor in long-term or intermittent long-term. And it is often made up electromagnetic starters with CJX8 series AC contactors.
Products meet the GB14048.4 standard.

Model and Meaning

Normal working conditions and installation conditions

Ambient temperature: -5℃+40℃, the average value does not exceed +35°C in 24 hours.
Altitude: no more than 2000m.
Atmospheric conditions: The relative humidity does not exceed 50% at +40°C, and higher relative humidity may be allowed at lower temperatures. For example, 90% at 20°C, special measures should be taken for the occasional condensation due to temperature changes.
Pollution level: 3 levels.
Installation category: Class III.
Installation conditions: The inclination of the installation face and the vertical is not more than ±5°.
In addition to mounting screws, the relay can also use 35mm standard rail.
Shock vibration: The relay should be installed and used in places where there is no significant shaking, shock and vibration.
Transportation, Storage: The relay should not be subject to severe impact and vibration during transportation, and it must not be affected by rain or snow in transportation and storage. Relays are suitable for transport and storage at -25°C ~ +55°C, and at +70°C for short periods (in 24h).

Structure Feature

Internal structure: insert combination typederive or independent type, independent type can be derived from insert type; with phase failure and temperature compensation structure.
Installation operation: cut off test button of the normally closed contact, and has the action instructions, free tripping function; can convert manual reset (JR29-16), auto reset (JR29-85), current transformer (JR29-250/370); independent, insert and guide rails and other installation methods; setting current continuously adjustable.

Main Technical Parameters

Adjustable range of setting current

Model JR29-16 JR29-25 JR29-45 JR29-85 JR29-105 JR29-170 JR29-250 JR29-370
AC contactor CJX8-9~16 CJX8-9~25 CJX8-9~45 CJX8-9~85 CJX8-37~170 CJX8-65~170 CJX8-250 CJX8-370

The action characteristics when each phase load is balance (20℃)

Setting current multiplier 1.05 1.2 1.5 7.2
Action time >2h <2h <2min >5s
Test conditions Cold Heat Heat Cold

The action characteristics when each phase load is unbalance (20℃)

Current multiple Action time Test conditions
Any two phase Third phase
1 0.9 >2h Cold
1.15 0 <2h Heat

Trip Level: Level 10A: JR29-16, JR29-25, JR29-45
Level 10: JR29-85XJR29-105\JR29-17CKJR29-250XJR29-370

Adjustable range of setting current

Model JR29-16 JR29-25 JR29-45 JR29-85 JR29-105 JR29-170 JR29-250 JR29-370
Adjustable range of setting current (A) 0.11~0.16 0.1~0.16 0.28~0.4 6.0~10 27~42 90~130 100~160 100~160
0.14~0.21 0.16~0.25 0.35~0.52 8.0~14 36~52 110~160 160~250 160~250
0.19~0.29 0.25~0.4 0.45~0.63 12~20 45~63 140~200 250~400 250~400
0.27~0.4 0.4~0.63 0.55~0.83 17~29 57~82     310~500
0.35~0.52 0.63~1.0 0.7~1.0 25~40 70~105      
0.42~0.63 1.0~1.4 0.86~1.3 35~55 80~115      
0.55~0.83 1.3~1.8 1.1~1.6 45~70        
0.7~1.0 1.7~2.4 1.4~2.1 60~100        
0.9~1.3 2.2~3.1 1.8~2.5          
1.1~1.5 2.8~4 2.2~3.3          
1.3~1.8 3.5~5 2.8~4.0          
1.5~2.1 4.5~6.5 3.5~5.2          
1.7~2.4 6~8.5 4.5~6.3          
2.1~3.0 7.5~11 5.5~8.3          
2.7~4.0 10~14 7~10          
3.4~4.5 13~19 8.6~13          
4.0~6.0 18~25 11~16          
5.2~7.5 24~32 14~21          
6.3~9.0   18~27          
7.5~11   25~35          
9.0~13   30~45          
12~17.6              

Model JR29-16 JR29-25 JR29-45 JR29-85 JR29-105/170/250/370
Number of auxiliary contact 95-96 97-98 95-96 97-98 95-96 96-98 95-98 95-96 97-98 95-96 97-98
Auxiliary contact form Electrically separated 1 NO and 1 NC contact Electrically separated 1 NO and 1 NC contact Electrically separated 1 NO and 1 NC contact or electrically unseparated changeover contacts 1 NC contact with 1 NO or 1 NC contact Electrically separated 1 NO and 1 NC contact
Rated operational current AC-15 (A) 220V 3 3 1.7 3 1.7 1.7 3 2.5 3 1.7
380V 2 2 1.3 2 1.3 1.3 2 1.3 2 1.3
500V 1 1.5 1.0 1.5 - 1 1.5 0.8 1.5 -
Rated insulation voltage (V) 600 500 500 380 500 500 500 380
Conventional thermal current (A) 10 10 10 10 10 3 10 10 10 10 6
Reset type Manual Manual and Auto Manual and Auto Manual and Auto Manual and Auto

Length and cross section of the main circuit connecting wire

Rated current (A) Cross-section of conductor (mm²) Length of connecting wire
0<I≤8 1.0 1
8<I≤12 1.5 1
12<I≤20 2.5 1
20<I≤25 4.0 1
25<I≤32 6.0 1
32<I≤50 10 1
50<I≤65 16 1
65<I≤85 25 1
85<I≤115 35 1
115<I≤150 50 2
150<I≤175 70 2
175<I≤225 95 2
225<I≤250 120 2
250<I≤275 150 2
275<I≤350 185 2
350<I≤400 240 2

Outline and lnstallation Dimension


Wiring diagram of circuit principle

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