Permanent Over & Under Voltage Auxiliary
A permanent over voltage on the low voltage installation can occur due to accidental loss of neutral, faulty connection between phases (400Vac) instead of phase to neutral (230Vac) or presence of harmonics.
MZ209 & MZ214
Such permanent over voltage is different from transient over voltage, which is covered by surge protection device (SPD).
The permanent over voltage can result in :
The over voltage auxiliary, MZ209, and combined over- and under-voltage auxiliary, MZ214, causes automatic opening of the electrical circuit by tripping the associated protection device (MCB, RCCB, RCBO) if there is a permanent over or under voltage detected on the network.
The permanent over voltage can result in :
- Equipment failure
- Overheating (reduction in length of life of equipment)
- Electrical breakdown (risk of fire)
- Deterioration in safety and protection of users.
The over voltage auxiliary, MZ209, and combined over- and under-voltage auxiliary, MZ214, causes automatic opening of the electrical circuit by tripping the associated protection device (MCB, RCCB, RCBO) if there is a permanent over or under voltage detected on the network.
Features
- Trip when the voltage decreases or increases out of the correct working voltage.
- Prevents reclosing of the MCB/RCCB/RCBO until the voltage resumes to within the normal threshold.
- Only 1 module width.
- Need to connect only 2 wires to each auxiliary.
- Mechanical indicator on the front face when auxiliary is activated.
General Characteristics
MZ209
MZ214
