The HHD11 series protection relay is designed for three‑phase 380 V, 50 Hz motor control circuits. It detects phase loss, phase sequence errors, voltage imbalance, and over‑ or under‑voltage conditions, and disconnects the motor power to protect the equipment.
The manual covers wiring diagrams, installation methods (panel‑mount or DIN‑rail), adjustment of over‑/under‑voltage thresholds, delay settings, contact status, and troubleshooting. It also includes example application circuits and detailed specifications for each model variant (A, B, C, D). This manual is written in Chinese.
| Working power supply | Three‑phase 380 V, 50 Hz |
|---|---|
| Voltage imbalance threshold | 50 V–75 V between any two phases |
| Over‑voltage protection (HHD11‑C) | 445 V–465 V (non‑adjustable) |
| Under‑voltage protection (HHD11‑C) | 290 V–310 V (non‑adjustable) |
| Contact rating | 3 A at AC 220 V (resistive load) |
| Phase loss protection action time | 3 s–5 s |
It provides phase loss, phase sequence, three‑phase voltage imbalance, and over‑/under‑voltage protection for motor circuits.
Adjust the potentiometer knob on the panel to set the over‑voltage value slightly below the equipment’s maximum allowed voltage.
The contacts are rated for 3 A at AC 220 V (resistive load).
The phase loss protection action time is set between 3 seconds and 5 seconds.