Description

The ABB 07KT98C GJR5253100R028 is a high-performance thermal overload relay engineered for robust motor protection in industrial automation systems. As part of ABB’s renowned TA/THE series, this device safeguards three-phase AC motors against potentially damaging overloads, phase imbalances, and phase loss conditions. Its core function involves continuously monitoring motor current through integrated current transformers and triggering a mechanical trip mechanism when thresholds exceed safe operating limits. Designed for seamless integration with ABB contactors like the A-series, the ABB 07TT98C GJR5253100R028 combines precision thermal modeling with manual reset functionality to prevent premature motor failure and reduce unplanned downtime.

Positioned within ABB’s comprehensive motor management ecosystem, this relay delivers critical value through its adjustable current setting range (0.11–28A), enabling precise calibration for diverse motor sizes. Its compact DIN-rail mountable design optimizes panel space while maintaining accessibility for maintenance. The ABB 07KT98C GJR5253100R028 features visual trip indication, test/reset buttons, and auxiliary contacts for remote status monitoring – essential for predictive maintenance strategies. With certifications spanning global markets, this relay exemplifies ABB’s commitment to operational safety and equipment longevity in demanding industrial environments, making it a cornerstone of reliable motor control centers worldwide.

07KT98C GJR5253100R028 ABB

Technical Specifications

Parameter Name	Parameter Value
Product Model	07KT98C GJR5253100R028
Manufacturer	ABB
Product Type	Thermal Overload Relay
Rated Operational Current (Ie)	28 A
Setting Current Range	0.11–28 A (Continuously Adjustable)
Rated Insulation Voltage (Ui)	690 V AC
Utilization Category	AC-3 (Squirrel Cage Motors)
Trip Class	Class 10A (Standard)
Auxiliary Contacts	1 NO + 1 NC
Ambient Temperature Range	-25°C to +60°C
Mounting	DIN Rail (EN 60715)
Connection Type	Screw Clamp
Standards Compliance	IEC/EN 60947-4-1, UL 508, CE
Phase Loss Sensitivity	Yes (Built-in Detection)
Mechanical Life	> 2 Million Operations

Main Features and Advantages

Precision Motor Protection: The ABB 07KT98C GJR5253100R028 employs bimetallic thermal technology calibrated to IEC standards, ensuring accurate response to overloads and phase imbalances. Its Class 10A trip characteristic provides fast protection against locked-rotor currents while tolerating harmless starting surges. The relay’s phase-loss detection capability automatically disconnects motors during single-phasing events – a critical feature preventing insulation damage and winding burnout.

Operational Flexibility: With a wide current adjustment range (0.11–28A), this single relay covers multiple motor sizes, reducing inventory complexity. The rotary dial allows precise setting without tools, while the integrated test button enables safe functional verification. The ABB 07KT98C GJR5253100R028 supports both manual and automatic reset configurations, adaptable to diverse safety protocols. Its transparent cover provides instant visual trip indication (red flag) and protects settings from accidental changes.

Durability and Integration: Engineered for harsh environments, the relay operates reliably at temperatures from -25°C to +60°C and withstands 50g mechanical shock. Compatible with ABB A9–A300 contactors via direct mechanical coupling, it eliminates additional wiring. The screw-clamp terminals accommodate solid or stranded conductors up to 10mm², ensuring vibration-resistant connections. Auxiliary contacts (1NO+1NC) enable remote alarm signaling or interlocking circuits, enhancing system diagnostics. This combination of precision, adaptability, and ruggedness makes the ABB 07KT98C GJR5253100R028 an indispensable asset for mission-critical motor protection.

Application Field

The ABB 07KT98C GJR5253100R028 is deployed across industries where motor reliability directly impacts productivity and safety. In manufacturing, it protects conveyor drives, CNC machine tools, and packaging equipment from overloads caused by mechanical jams or bearing failures. Water/Wastewater treatment facilities utilize this relay for critical pumps and blowers, where phase imbalances from grid fluctuations could lead to catastrophic flooding or aeration failures.

HVAC systems rely on the ABB 07KT98C GJR5253100R028 to safeguard compressors and cooling tower fans, preventing costly downtime in commercial buildings and data centers. Within material handling, the relay ensures uninterrupted operation of crane hoists and automated guided vehicles (AGVs). Its IP20-rated enclosure suits control cabinet installations in food processing plants, where washdown-resistant motor starters prevent contamination-related shutdowns. For mining and cement industries, the relay’s vibration tolerance provides robust protection for crushers and kiln drives exposed to extreme mechanical stress. The ABB 07KT98C GJR5253100R028 also serves in renewable energy applications, such as solar tracker motors and biogas compressor protection, demonstrating its versatility across modern industrial ecosystems.

07KT98C GJR5253100R028 ABB

Related Products

ABB A30-30-10: Contactor designed for direct mechanical coupling with 07KT series relays, rated 30A.

ABB 1SBL182001R1000: Electronic overload relay offering advanced diagnostics and communication capabilities.

ABB GJR5253100R010: Lower-current variant (0.1–10A) of the same thermal relay series.

ABB OTDC-16: DIN-rail time delay accessory for coordinated motor restart sequencing.

ABB MS116: Motor starter combination unit integrating contactor and 07KT relay.

ABB 2CDS271001R0485: Auxiliary contact block for expanding relay signaling capacity.

ABB 1SFA616105R1100: Phase loss monitoring relay for upstream voltage protection.

ABB CM-ENS.13S: Energy monitoring module for power consumption tracking.