Thermal Overload Relay JR28-25(LR2-D13)4-6A - KAYAMA

Technical Description

The Kayama JR28-25 (LR2-D13) Thermal Overload Relay is designed to protect electric motors against prolonged overload conditions.

Its stated adjustable current range is 4 to 6 A, and it should be selected and adjusted according to the rated current shown on the motor nameplate.

Technical Characteristics

• Brand: Kayama
• Model: JR28-25
• Reference: LR2-D13
• Type: Thermal overload relay
• Adjustable current range: 4 to 6 A
• Application: motor protection against prolonged overload
• Reset: manual and automatic
• Mounting: contactor coupling or DIN rail installation depending on version/accessory
• Stated material: thermoplastic
• Approximate height: 75 mm
• Approximate width: 45 mm
• Approximate depth: 70 mm
• Approximate weight: 200 g

Overload Protection

The JR28-25 detects conditions where the motor remains above the adjusted current for a sufficient period.

When the overload persists, the thermal mechanism trips and changes the state of the relay's auxiliary contacts.

Adjustable 4–6 A Range

The relay should be adjusted according to the motor rated current.

Motor power alone should not be used as the only selection criterion.

Manual and Automatic Reset

The product information states manual and automatic reset capability.

Automatic reset should only be used where the control and safety logic prevents hazardous unexpected restarting.

Short-Circuit Protection

The JR28-25 does not replace short-circuit protection.

Suitable circuit breakers, fuses or other protection devices remain necessary.

Trip Class

The exact trip class has not been confirmed.

The expression “industrial standard” does not technically define a trip class.

Contactor Compatibility

Compatibility with contactors must be confirmed according to terminal geometry, pole spacing, mounting system, frame size and electrical characteristics.

Dimensions

Approximate stated dimensions:

• Height: 75 mm
• Width: 45 mm
• Depth: 70 mm
• Weight: approximately 200 g

Enclosure Material

The enclosure is stated to be made of thermoplastic.

Specific polymer type, flammability class and thermal properties were not confirmed.

Installation and Safety

Installation should be performed by qualified personnel.

Before energizing, verify motor current, relay setting, contactor compatibility, short-circuit protection and wiring.

Registration Information

• Brand: Kayama
• Model: JR28-25
• Reference: LR2-D13
• Current range: 4–6 A
• Type: Thermal overload relay
• Reset: manual and automatic
• Material: thermoplastic
• Approximate dimensions: 75 × 45 × 70 mm
• Approximate weight: 200 g

Kayama Quality

The Kayama JR28-25 LR2-D13 4–6 A Thermal Overload Relay is part of Kayama's professional range for motor control and protection.