Products Thermal Overload Relay KFR3H Series Thermal Overload Relay

KFR3H Series

Thermal Overload Relay

Focusing on mid-to-high-end power distribution market solutions

KFR3H series thermal overload relays are primarily used in AC 50Hz or 60Hz power systems with rated insulation voltage up to 690V and operating voltage up to 690V, providing current overload protection and phase failure protection. The product's setting current is adjustable (0.1A to 336A). The product features temperature compensation, operation indication, automatic and manual reset, and stop functions.

● Auto temperature compensation design adjusts parameters in response to ambient temperature changes, enhancing product reliability.
● The auxiliary contacts feature an independent design with 1 normally open (NO) and 1 normally closed (NC) contact, allowing control of two different power sources for convenient wiring.
● An easy-to-use toggle switch is fitted for selecting between manual and automatic reset.
Product Details
Suitable for
Product Features
● Auto temperature compensation design adjusts parameters in response to ambient temperature changes, enhancing product reliability. Snap-on installation for quick and easy mounting.
● The auxiliary contacts feature an independent design with 1 normally open (NO) and 1 normally closed (NC) contact, allowing control of two different power sources for convenient wiring.
● An easy-to-use toggle switch is fitted for selecting between manual and automatic reset.
Performance Features
● High Performance: precise current setting range allows accurate adjustment even at intermediate scale values. Extended current range accommodates various motor full-load amperage (FLA) requirements.
● High reliability: Providing overload protection and phase failure protection.
● Safety: Utilizing plastic material with the highest flame-retardant rating compliant with UL94 standard to maintain normal operating characteristics in high-temperature environments up to 50°C.
● Environmental protection: Using environmentally friendly recyclable materials compliant with RoHS requirements. Reducing power consumption to enhance energy efficiency, thereby contributing to environmental protection.
Operating and Installation Conditions
Technical Parameters
Industry Applications
Multiple breaking capacities for versatile applications
Special Applications

Suitable for demanding environments with high short-circuit currents, such

as large power plants and heavy industries.

Heavy Industry Sector

Suitable for high-performance applications with high short-circuit current requirements, such as industrial production lines, critical power equipment, and heavy industry sectors.

Construction Industry

Suitable for conventional applications with low short-circuit currents, such as residential buildings, schools, hospitals, infrastructure, and factory lighting distribution areas.

Inquire Now