JR28 Thermal Overload Relay

Overview

The VIOX JR28 series thermal overload relays are designed to protect AC motors from overload and phase failure. These relays offer comprehensive protection for motors operating at 50/60Hz frequency with voltages up to 690V and currents ranging from 0.1A to 93A.

Key Features

Wide Operating Range: Suitable for 50/60Hz, up to 690V AC
Versatile Current Protection: 0.1-93A range
Multiple Protection Functions: Overload and phase failure protection
Flexible Reset Options: Manual and automatic reset available
Temperature Compensation: Ensures reliable protection across various conditions
Status Indication: Clear ON/OFF status display
International Compliance: Meets IEC 60947-4-1 standards

Technical Specifications

Main circuit characteristics
Rated insulation voltage Ui	690V
Rated impulse withstand voltage Uimp	6kV
Tripping class	10A
Current setting range	0.4…0.63A
Conductors cross-section	1×1,5…10 mm²flexible cable without cable end 1×1…4 mm²flexible cable with cable end 1×1…6 mm²rigid cable without cable end
Tightening torque	1,85 N·m
Auxiliary contacts characteristics
Conventional thermal current	5A
Max power of the contactor coil	100VA at 24V AC 200VA at 48V AC 400VA at 110V AC 600VA at 220V AC 600VA at 380V AC 600VA at 600V AC
Short-circuit protection	fuse gG 5A
Conductors cross-section	1×1…2,5 mm²/2×1…2,5 mm²flexible cable without cable end 1×1…2,5 mm²/2×1…2,5 mm²flexible cable with cable end 1×1…2,5 mm²/2×1…2,5 mm²rigid cable without cable end
Tightening torque	1,2 N·m
Environmental characteristics
Degree of protection	IP2X
Operating temperature	-30°C…+55°C
Storage temperature	-60°C…+70°C

Test	Series No.	I/I_n		Operating time, T_p	Start condition
Overload protection	1	1,05		> 2h	Cold state
	2	1,2		< 2h	Heat state following the No.1 test
	3	1,5		< 4min	Heat state following the No.1 test
	4	7,2		2s<T_p≤10s	Cold state
Phase failure protection	5	any 2 phases	another phase	> 2h	Cold state
	5	1,0	0,9	> 2h	Cold state
	6	1,15	0	< 2h	Heat state following the No.5 test

Dimension

Model

Item	Code	Rated current(A)	Contactor
JR28-13	1301	0.1-0.16	CJX2-09 CJX2-12 CJX2-18 CJX2-25
	1302	0.16-0.25
	1303	0.25-0.4
	1304	0.4-0.63
	1305	0.63-1
	1306	1-1.6
	1307	1.6-2.5
	1308	2.5-4
	1310	4-6
	1312	5.5-8
	1314	7-10
	1316	9-13
	1321	12-18
	1322	17-25
	1353	23-32
JR28-23	2353	23-32	CJX2-32
JR28-23	2355	28-36	CJX2-32
JR28-33	3353	23-32	CJX2-40 CJX2-50 CJX2-65 CJX2-80 CJX2-95
	3355	30-40
	3357	37-50
	3359	48-65
	3361	55-70
	3363	63-80
	3365	80-93

Certifications

Applications

Ideal for motor protection in:

Industrial machinery
HVAC systems
Pumps and compressors
Conveyor systems
Manufacturing equipment
Process control systems
Material handling equipment

Benefits

Comprehensive motor protection against overload and phase failure
Flexible installation options for various control panel designs
Accurate protection with temperature compensation
Easy monitoring with clear status indication
Adaptable to different motor sizes with wide current range
Compliant with international safety standards
Suitable for continuous operation in industrial environments

Product Range

The JR28 series includes multiple models to accommodate different current ranges and contactor sizes. Please refer to the detailed specification chart for specific model information and compatibility with various contactors.

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