Product Short Description
Product Introduction
The GE CR224 is a 3‑phase thermal overload relay engineered to protect 3‑phase induction motors and electrical loads from overload, phase loss, and excessive temperature‑related damage. It integrates a thermal bimetal heating element and ambient‑compensated design (select models) to maintain consistent tripping characteristics across varying temperatures. The relay operates by heating the bimetal strip via motor current; overloads deflect the strip to trip the control circuit, disconnecting the contactor and stopping the motor. It offers field‑adjustable tripping current (±10%), auxiliary contact options (1NC or 1NO+1NC), and compatibility with NEMA‑rated contactors (Sizes 00–7). It meets UL 508, IEC 60947‑4‑1, and CE standards, delivering reliable protection in industrial automation, power distribution, and motor control centers with minimal maintenance downtime.
Description
Technical Specifications
| Parameter | Details |
|---|---|
| Brand | GE Industrial Solutions (General Electric) |
| Series | CR224 |
| Product Type | 3‑Phase Thermal Overload Relay |
| Size Categories | Size 1 (CR224C), Size 2 (CR224D), Size 3 (CR224E), Size 4 (CR224F), Size 5 (CR224G), Size 6 (CR224H), Size 7 (CR224J) |
| Rated Voltage (Ue) | 600V AC (max system voltage); 1000V AC (insulation voltage, Ui) |
| Phase | 3‑phase |
| Trip Current Adjustment | ±10% via front dial for fine‑tuning to motor full‑load current (FLA) |
| Current Ranges | Size 1: 9–13A; Size 2: 18–25A; Size 3: 23–32A; Size 4: 30–42A; Size 5: 40–56A; Size 6: 54–75A; Size 7: 70–100A (varies by submodel) |
| Auxiliary Contacts | 1NC (standard); 1NO+1NC (optional) |
| Reset Type | Manual (standard) or automatic (optional) |
| Ambient Compensation | Ambient‑compensated (red reset arm) or non‑compensated (black reset arm) |
| Operating Temperature | ‑40°C to +70°C |
| Storage Temperature | ‑55°C to +85°C |
| Mounting | Panel mount; side‑mount on NEMA contactors (Sizes 00–7) |
| Terminal Type | Power terminals: Screw‑clamp (Size 1: #8 AWG; Size 2: #4 AWG; Size 3: #1/0 AWG; Size 4: 2/0 AWG) |
| Control Terminals | Pressure‑type, max #12 AWG |
| Certifications | UL 508, IEC 60947‑4‑1, CE compliant |
| Weight | 1.0–1.2 kg (varies by size) |
| Dimensions | 120 mm × 85 mm × 65 mm (height × width × depth, typical for Size 3) |
Functional Features
- Field‑Adjustable Trip Current: ±10% dial adjustment eliminates heater replacement for minor FLA changes, reducing inventory and downtime.
- Ambient Compensation: Red reset arm models maintain consistent trip times from ‑40°C to +70°C; black reset arm models suit stable‑temperature environments.
- Auxiliary Contact Flexibility: 1NC or 1NO+1NC options enable remote alarm, status monitoring, and interlocking in control circuits.
- Welded Contact Check: Brown operator at the top allows quick verification of welded auxiliary contacts without disassembly.
- NEMA Contactor Compatibility: Direct side‑mount on NEMA Sizes 00–7 contactors for integrated motor control and protection.
- Dual Reset Options: Manual reset ensures safe restart after overloads; automatic reset for unattended systems (with time delay).
- Reliable Thermal Actuation: Bimetal strip design provides accurate, repeatable trip curves for Class 10 (10‑second trip at 6× FLA) protection.
- High Voltage Insulation: 1000V AC insulation voltage ensures safety in medium‑voltage control circuits.
- Easy Installation: Screw‑clamp terminals accept copper/aluminum cables; panel or contactor‑mount design simplifies integration.
- Global Compliance: UL, IEC, and CE certifications ensure performance in global industrial projects.
Application Scenarios
- Industrial Motor Protection: Protects 3‑phase induction motors in pumps, fans, compressors, and conveyors from overload and phase loss.
- Motor Control Centers (MCCs): Integrates with NEMA contactors in MCCs for centralized motor protection and control.
- Power Distribution: Guards feeder circuits in low‑voltage switchgear against overloads in factories and commercial buildings.
- Heating & Ventilation (HVAC): Protects large electric heaters, fan coils, and chiller compressors in industrial/commercial HVAC systems.
- Capacitor Bank Protection: Prevents overloads in power factor correction capacitor banks during switching or grid fluctuations.
- Marine & Offshore: Safeguards shipboard motors and auxiliary loads in salt spray and temperature‑extreme environments.
- Oil & Gas: Protects pumps, compressors, and process heaters in upstream/downstream facilities with harsh operating conditions.
- Renewable Energy Systems: Shields inverters and auxiliary motors in solar/wind installations from overloads during variable power output.
- Railway & Transportation: Guards traction motors and auxiliary systems in locomotives and rail vehicles against current surges.
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