Time relay MMR17-PDF-A230-108 is designed to protect loads (inductive motors) against voltage asymmetry and wrong phase rotation in 3 phase networks. If the assymetry voltage above the adjustable threshold 30…70V or wrong rotation lasts longer than detection time, the output relay is switched off. The relay can be recovered to normal operation if asymmetry drops below the threshold and the rotation is correct.
Time function available in the MMR17-PDF-A230-108 relay:
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Functions – MA (asymmetry) – Asymmetry monitoring. As soon as the asymmetry exceeds the value at the Uas – regulator, the set interval of the tripping delay (DELAY) begins. After the interval has expired the output relay R switches into off-position (yellow LED not illuminated). |
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Function – MS (sequence) – Phase sequence monitoring. When all the phases are connected in the correct sequence and the measured asymmetry is less than the set value, the output relay switches into on-position (yellow LED illuminated). When the phase sequence changes, the output relay switches into off‑position (yellow LED not illuminated). |
Connections
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Front Panel |
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| Version | MMR17-PDF-A230-108 |
|---|---|
| Output Circuit |
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| Contact arrangement | 1NO/NC |
| Rated switching current In | AC1 – 8A/250V AC DC1 – 8A/24V DC |
| Maximum continuous current | 8A |
| Switching load range AC1 | 2 000VA |
| Rated/maximum contact voltage | 250/400V AC |
| Contact resistance | ≤ 100mΩ |
| Maximum switching frequency |
600 cycles/h |
| Input Circuit |
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| Supply voltage Un | 3x 400/250V AC |
| Tolerance |
0,8…1,1Un (184…253V) |
| Phase power supply of control circuit | L1 |
| Rated consumption | ≤ 8VA |
| Rated frequency | 47…63Hz |
| Rated surge voltage | 1 000V |
| Insulation |
|
| Insulation rated voltage | 400V AC |
| Rated surge voltage | 4 000V (1,2/50μs) |
| Overvoltage category | III |
| Pollution degree |
2 |
| Dielectric strength input-output | 4 000V AC |
| Dielectric strength open contact | 1 000V AC |
| Measuring circuit |
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| Regulation asymmetry range Uasym |
30…70V |
| Functions | MA, MS |
| Setting accuracy |
≤ 5% |
| Repeatability | ≤ 2% |
| Time Module |
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| Time off delay |
Adjustable 1…6s |
| Recovery time |
1.2s |
| Reset time |
≤ 500ms |
| Timing accuracy |
20% |
| General data |
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| Electrical life AC1 at 1000VA resistive load |
≥ 150 000 |
| Mechanical life |
≥ 10 000 000 |
| Dimensions (L x W x H)/Weight |
90 x 17.5 x 66mm / 53g |
| Ambient temperature |
-20…+55°C |
| Storage temperature | -40…+70°C |
| IP rating | IP20 |
| Relative humidity |
85% |
| Shock resistance | 15g |
| Vibration Resistance | 0.35mm (10…55Hz) |
| LED indicator | 2 LED |
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Order by e-mail |
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MMR17-PDF-A230-108 |
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Declaration of conformity CE |
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It is used to secure loads (eg. motors) from the voltage unbalance, incorrect phase sequence or damage to the executive contactor’s contacts.
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