Features of Digital Motor Protection Relay
- Error in measurement ≤1%
- Three-phase monitoring for phase loss, current imbalance, undercurrent, overcurrent, locked rotor, and short circuit
- monitoring of overvoltage and undervoltage in one or two phases
- ground fault in the earth (should couple with ZCT)
- 1NO+1NC, distinct output connections
- LCD displaying the current status
- recording of the last three faults
Application of Digital Motor Protection Relay
- Used in motor system
- Monitor motor running status
- Protect the motor from damage such as overload, short circuit, over temperature, etc.
- Industrial production lines, mechanical equipment, power systems
Specification of Digital Motor Protection Relay
| Model |
MDB-301Z |
MDB-301F |
| Structure |
Integrative |
Separate |
| Mounting |
Panel mounting & Din rail |
Flush mounting |
| Power supply |
AC220V,AC380V,50/60Hz |
|
| Current range |
0.3-16A,3-160A,100-999A ***For 10-999A type,the relay should couple with external CT and set the CT ratio*** |
|
| Measurement error |
1% |
|
| Overcurrent delay |
definite time:0.5-60s; inverse time:1-5 trip class |
|
| Undercurrent threshold |
Same as overcurrent,delay 0.5-60s |
|
| Start-up delay |
0-200s |
|
| Locked-rotor threshold |
1.5-8 time of overcurrent,delay 3s |
|
| Short circuit threshold |
3-22 time of overcurrent,delay≤50ms |
|
| Current unbalance threshold |
10-50%,delay 5s |
|
| Phase loss delay |
2s |
|
| Ground fault threshold |
30mA-2.5A,delay 1s |
|
| Overvoltage threshold |
65-690V,delay 5s |
|
| Undervoltage threshold |
65-600V,delay 5s |
|
| Auto-reset time |
0.1-30minutes |
|
| Auto-reset count |
1-10 |
|
| Reset mode |
Manual / Auto /power cycle |
|
| Output contacts |
1NO+1NC |
|
| Contact capacity |
5A/AC220V,3A/AC380V(Resistive) |
|
| Dimensions (L x W x D) |
90×70×106.5mm |
91 x 47 mm(cut-out hole size) |
