Description
Product Overview
The c is a Size 6 3-pole AC contactor, originally manufactured by General Electric (GE) and now part of ABB legacy CR-series low voltage motor control product line. It is rated 540A, 400HP, equipped with a 480VAC operating coil. This heavy-duty contactor is designed for switching large three-phase induction motors, capacitors and other high-current industrial loads in motor control centers (MCC), serving as a core switching component for heavy motor starting and protection circuits.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | ABB (Legacy GE CR Series) |
| Part Number | CR305HH004BD1H |
| Device Type | 3-Pole AC Contactor, Size 6 |
| Rated Continuous Current | 540 A |
| Motor HP Rating | 400 HP @ 480VAC 3-phase |
| Coil Voltage | 480 VAC |
| Number of Poles | 3 Main Power Poles |
| Enclosure | Open type, mount inside MCC bucket or control cabinet |
| Operating Frequency | 50 / 60 Hz |
| Mechanical Life | 10,000,000 operations |
| Electrical Life (AC-3) | 1,000,000 operations |
| Ambient Operating Temp | -20°C ~ +60°C |
| Mounting | Panel / MCC bucket mounting |
| Standards Compliance | IEC / NEMA rated |
Key Features
- NEMA Size 6 heavy-duty contactor for large horsepower motor switching
- 480VAC coil provides reliable pull-in and hold operation for industrial control voltage
- Robust silver alloy main contacts built for repeated high-current make / break cycles
- Integral arc chutes for arc suppression under high current interruption
- Optional auxiliary contact add-ons for status feedback and interlock logic
- Suitable for AC-3 duty: motor starting and stopping under normal operating conditions
- Widely used as replacement spare for legacy GE MCC and motor starter assemblies
Installation & Test Notes
- Isolate all three-phase main power and control coil supply, perform lockout/tagout before installation or maintenance.
- Check contactor coil rating matches control circuit voltage (480VAC) before energizing.
- Torque main power terminal connections to specified value; loose terminals cause overheating.
- Verify proper alignment of moving armature and arc chute assembly; ensure no mechanical binding.
- Apply control voltage and test coil pull-in; check for chatter, abnormal noise or overheating.
- Perform continuity test on main poles and auxiliary contacts in energized / de-energized state.
- Inspect main contact wear periodically; replace contact assembly when pitting or erosion exceeds limits.
Application
Mainly deployed in industrial motor control centers, water treatment pumping stations, mining conveyors, large fan and compressor systems, refinery and chemical plant motor loads. Used for direct-on-line starting and stopping of large three-phase AC motors.
FAQ
Q: What NEMA size is CR305HH004BD1H? A: It is NEMA Size 6 contactor, rated for 400HP @480V three-phase motor loads.
Q: What coil voltage does this contactor use? A: The built-in coil is 480VAC 50/60Hz.
Q: Can this contactor be used for capacitor switching? A: It can be applied for capacitor bank switching, but must derate and confirm AC-6b duty rating and add surge protection as required.
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