1 Year Warranty
Description
Product Overview
CK85BA300 (GE CK85‑BA300, also known as CK85EA300) is a 3‑pole heavy‑duty AC contactor manufactured by GE (General Electric). Designed for switching large‑capacity AC motors and power‑circuit loads, it is widely used inside power‑plant auxiliary cabinets, pumping stations, metallurgical motor control centres and large‑scale industrial MCC cabinets. It controls start‑stop of high‑power three‑phase motors, heaters and transformer loads, and serves as critical maintenance spare for legacy GE‑configured industrial control systems.
Large‑power motor‑switching scenarios demand high‑current breaking‑capacity, anti‑weld performance and long mechanical endurance under frequent start‑stop cycles. CK85BA300 adopts robust main‑contact silver‑alloy material, with independent coil‑actuation system and auxiliary‑contact sets for status feedback to PLC/DCS systems. The modular main‑pole structure allows convenient on‑site replacement of contact kits during overhaul. Widely deployed as drop‑in replacement spare for existing MCC cabinets without modifying cabinet‑mounting holes or power‑cable wiring.
Technical Specifications
| Parameter name | Parameter value |
|---|---|
| Product model | CK85BA300 (alternative marking CK85EA300) |
| Manufacturer | GE General Electric |
| Product type | 3‑Pole AC main contactor |
| Rated operational current AC‑3 | 300 A |
| Rated operational voltage | Up to AC 690 V 50/60 Hz |
| Rated control coil voltage | Multiple options (110VAC / 230VAC / 400VAC) |
| Auxiliary contacts | Built‑in NO/NC auxiliary contacts for remote status feedback |
| Mechanical endurance | 10 million operations |
| Electrical endurance (AC‑3) | 1 million operations |
| Mounting method | Screw‑mount onto back‑plate inside MCC cabinet |
| Protection class | IP20 |
| Ambient operating temperature | ‑20 °C ~ +60 °C |
| Weight | Approx. 5.2 kg |
| Certifications | CE, UL‑listed, IEC‑60947‑1 / IEC‑60947‑4‑1 compliant |
Key Features and Advantages
heavy‑duty 300A high‑current switching capability: CK85BA300 supports AC‑3 300 A rated load, suitable for direct‑on‑line starting and running control of large‑size three‑phase asynchronous motors.
reliable silver‑alloy main contacts: High‑performance contact material resists arc ablation and contact‑welding during motor inrush‑current switching, extending service‑life under heavy‑load conditions.
configurable auxiliary‑contact sets: Auxiliary NO/NC contacts provide contactor ON/OFF status feedback signals to DCS/PLC systems for interlock‑logic and remote monitoring.
CK85BA300
modular‑main‑pole maintainable design: Main‑contact assemblies can be individually replaced during overhaul, no need to replace the whole contactor, reducing maintenance‑cost.
standard cabinet‑mount footprint: Unified mechanical installation dimensions; can directly replace aged CK85‑series contactors in existing MCC cabinets, without cabinet modification or reworking power‑cable terminals.
coil‑voltage must match field site: Multiple coil‑voltage variants exist; wrong coil‑voltage will result in failure to pull‑in or coil burnout during commissioning.
Application Fields
CK85BA300 is installed within motor‑control‑centre (MCC) cabinets for thermal‑power‑plant auxiliary systems, water‑treatment plants, mining sites, cement plants and large industrial factories.
It undertakes switching‑control for high‑power fans, circulating‑water pumps, compressors and large conveyor‑belt motors. Auxiliary‑contact signals feed back contactor status to DCS/PLC for interlock‑protection and remote monitoring.
During equipment overhaul and spare‑replacement projects, it replaces worn‑out CK85‑series contactors. Existing power‑cables, control‑wiring and cabinet mounting‑structure can be fully reused, shortening equipment downtime. It is a key spare‑part for plant‑maintenance‑workshops supporting legacy GE MCC assets.
Related Products
- CK85‑series contact replacement kit: Spare main‑contact sets for maintenance
- Coil assemblies: Replacement AC coil for CK85BA300 (multiple voltage options)
- MCC cabinet drawer unit: Installation housing for this contactor
- Overload relay: Thermal‑overload protection matched in series with CK85BA300 for motor‑over‑current protection
- PLC / DCS digital‑input module: Receives auxiliary‑contact status‑feedback signals
Installation and Maintenance
pre‑installation preparation: Completely power‑off upstream circuit before installing CK85BA300. Verify coil‑voltage matches site control‑supply voltage. Torque‑tighten main‑circuit power‑cable terminals according to specification; loose terminals will cause over‑heating. After mechanical installation, perform pull‑in / drop‑out test, confirm auxiliary‑contact signal status before putting motor‑circuit online.
maintenance recommendations: During unit outages, inspect main‑contact ablation condition, check terminal‑screw tightness. Replace contact kit when contacts are severely eroded. Do not hot‑swap under energised condition. This contactor can be field‑maintained by replacing contact‑kit and coil; defective complete unit can be returned to GE‑authorized repair‑centres.
Product Warranty & Support
Each CK85BA300 passes factory contact‑performance test, coil pull‑in test and high‑voltage withstand inspection before shipment. Standard equivalent warranty covers manufacturing defects for 12 months from delivery date. Spare‑part sourcing, remote‑technical guidance and SAT‑support services are available for spare‑replacement, loop‑check and fault‑diagnosis. Application‑engineers offer support for coil‑voltage selection and motor‑switching‑circuit troubleshooting. Long‑term spare‑parts inventory mitigates obsolescence risk for installed GE MCC assets.
