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JR20 Thermal Overload Relay
  • JR20 Thermal Overload RelayJR20 Thermal Overload Relay

JR20 Thermal Overload Relay

JR20 Thermal Overload Relay are suitable for circuits with AC 50Hz, voltages up to 660V, and currents up to 630A, to protect against overload, phase failure and three phase unbalance of AC motor.

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Product Description

JR20 Thermal Overload Relay are suitable for circuits with AC 50Hz, voltages up to 660V, and currents up to 630A, to protect against overload, phase failure and three phase unbalance of AC motor.


JR20 Thermal Overload Relay Details


Application

JR20-10L series thermal overload relay are suitable for overload and phase-failure protection of AC motors with frequency of 50/60Hz, voltage up to 660V, current up to 0.16-630A under 8-hours duty or uninterrupted duty.

Functions provided by these relays are: Phase-failure protection, temperature compensation, ON/OFF indication, and manual/automatic reset.

Applicable Standards: National Standard: GB 14048, International Standards: IEC 60947-4-1

LR20- L, L shows installed as single units

The relays can be mounted onto contactors or installed as single units.


Operating Conditions

The altitude couldn t exceed 2000m.

Ambient temperature: -5 ~+55 degree centigrade and the average temperature no more than +35 degree centigrade in 24 hours.

Atmosphere: Comparative humidity no more than 50% at max +40 degree centigrade, and it may be higher at a lower temperature. The lowest average temperature no more than +20 degree centigrade in the wettest month.

The maximum average comparative humidity of this month could not exceed 90%, The change of temperature leading to dew on the product must be considered.

Class of pollution: Class 3.

The slope between installation surface and vertical surface could not exceed plus and minus 5 degree

Keeping away from explosive, corrosive and electric atomy.

Keeping dry.

The product should be used and installed at certain place without any shock, vibration etc.


Technical Data

Item


JR20-25L

JR20-63L

JR20-160L

JR20-630L

Rated operational current


25

63

160

630

Rated operational voltage


660

660

660

660

Phase-failure protection


Yes

Yes

Yes

Yes

Manual/Auto reset


Yes

Yes

Yes

Yes

Temperature compensation


Yes

Yes

Yes

Yes

Releasing indicator


Yes

Yes

Yes

Yes

Test button


Yes

Yes

Yes

Yes

Stop button


Yes

Yes

Yes

Yes

Auxiliary


1NO+1NC

1NO+1NC

1NO+1NC

1NO+1NC

NC 95-96

127V rated current A

4.3

4.3

4.3

4.3


220V rated current A

2.5

2.5

2.5

2.5


380V rated current A

1.5

1.5

1.5

1.5

NC 97-98

220V rated current A

1.6

1.6

1.6

1.6


380V rated current A

1.0

1.0

1.0

1.0

Mounting


as single unit

as single unit

as single unit

as single unit

Conductor
cross
section
(mm2)

Main circuit

Solid or stranded conductor

1.5~6.0

4.0~25

10~95

480A 2 x 150

Auxiliary
circuit

> 480A 2 x 185

Terminal screw

M5

M6

M8

M10

Solid or stranded conductor

1.0

1.0

1.0

1.0

Terminal screw

M3.5

M3.5

M3.5

M3.5


Protection Characteristics

Item

NO

Times the setting current


Release time

Test condition

Overload
protection

1

1.05


> 2h

Start from Cold status

2

1.2


< 2h

Start from Hot status right after item no. 1

3

1.5


< 2m

Start from Hot status right after item no. 1

4

7.2


2s< Tp< 10s

Start from Cold status

Phase - failure
protection


Any two phases

Another phase



5

1.0

0.9

> 2h

Start from Cold status

6

1.15

0

< 2h

Start from Hot status right after item no. 1

7

3pole 1.0


> 2h

Start from Cold status

8

2pole 1.32

1pole 0

< 2h

Start from Hot status right after item no. 1




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