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🔌 Motor Protection Relay Comparison Table
| Brand | Model | Voltage Range (Supply / Motor) | Temp Range (°C) | Relay Output | Monitoring Features | Notes |
|---|---|---|---|---|---|---|
| REFCOMP (KRIWAN) | RCX-A2 | AC100–250V / AC200–660V | –30 to +60 | AC250V 5A | PTC, phase sequence, phase loss, exhaust temp | Used in YORK, Dorin, Frascold, Hanbell |
| KRIWAN | INT69 | AC115–230V / AC200–690V | –30 to +70 | AC240V 2.5A | 1–9 PTC, AMS, phase monitoring, diagnostics | Multiple variants: INT69 Diagnose, INT69Y |
| BITZER | SE-B2 | AC208–240V / AC200–632V | –30 to +70 | AC250V 3A | 1–9 PTC, phase sequence, phase failure | Lockout after repeated faults |
| BOCK | MP10 (06913) | AC230V / AC250V Relay | –30 to +60 | AC250V 3A | Motor winding, discharge temp, LED indicators | Semi-hermetic compressors |
| HANBELL | HB-MP1 | AC115–240V / AC200–690V | –30 to +70 | AC240V 2.5A | PTC, phase sequence, phase failure, diagnostics | Reset delay logic, UL approved |
| HANBELL | JTX-A | AC220V / AC200–690V | –20 to +60 | AC250V 5A | LED status, phase monitoring | Compact and visual fault indication |
🧠 Key Insights
- KRIWAN INT69 series offers the most flexible diagnostics and sensor compatibility, ideal for advanced monitoring.
- BITZER SE-B2 and BOCK MP10 are tailored for reciprocating and semi-hermetic compressors with robust lockout logic.
- HANBELL HB-MP1 and JTX-A provide cost-effective protection with phase and temperature monitoring, suitable for chillers and screw compressors.
- REFCOMP RCX-A2 is widely adopted across European and Asian compressor brands, offering reliable baseline protection.
US 5766 
GB 4288 
CA 4018 
AU 3897 
IE 3132 
NZ 934 
BR 743 
SG 568 
