HHD11 Series protection relays monitor three-phase AC380V supply conditions for equipment that depends on correct phase order and stable voltage. HHD11-A focuses on phase sequence protection, while HHD11-C/D adds voltage and phase-failure monitoring functions.
Common Parameters
| Working Power Supply | Three-phase AC380V, 50Hz |
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| Display Mode | LED working status indication |
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| Contact Form | One set of NO and NC contacts |
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| Contact Capacity | 3A AC250V resistive load |
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| Dimensions | 24.5 × 85.5 × 90.5mm |
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| Installation Method | Screw mounting or 35mm DIN rail mounting |
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HHD11-A
| Protection Function | Phase sequence protection |
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| Application Note | Suitable for elevator power phase sequence protection and replacement of common elevator phase sequence protectors where ratings match |
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HHD11-C/D
| Protection Functions | Overvoltage, undervoltage, phase failure, phase sequence, voltage imbalance |
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| Adjustment | D version supports adjustable overvoltage and undervoltage thresholds |
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