It operates on a root mean square value of a fundamental wave.

This relay uses the input voltage at the VT secondary side (P1-P2) as the relay control power source. When a rated volta

Because when an undervoltage is detected, b contact will be closed, if power supply (P1-P2) is lost, the contact is reta

This relay has a capacitor to operate in case of the lost power or at the maximum settling of an operation time. Because

That is described as below. (1) By laying ZCTs for two feeders having different loads, detected by one earth fault d

It is impossible. In Standard JIS C 4609, warranty is covered for combination of peripheral devices and relays. Therefor

The contact recovers automatically.

It is impossible. Because the type is to detect by ZCT in an ungrounded system, the sensitivity becomes very high.

Overload tolerance of an over current relay is 200 A, 1 second. Adjust CT ratio and others not to input more than 200 A.

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Protection Relays

Protection Relays - MELPRO-A Series(72)

MOC(13)
MGR(5)
MDG(8)
MUV(6)
COMMON(4)

FAQ within [ Protection Relays ]

21-30 of Total 36

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Detection of current

It operates on a root mean square value of a fundamental wave. More Details >>
- No：23710
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , MOC
Movement of contact

This relay uses the input voltage at the VT secondary side (P1-P2) as the relay control power source. When a rated voltage is input, b contact side of the co... More Details >>
- No：23733
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , MUV
About contact

Because when an undervoltage is detected, b contact will be closed, if power supply (P1-P2) is lost, the contact is retained. More Details >>
- No：23735
- Release Date：2018/09/19 17:16
- Update：2018/09/20 14:58
- Category： Protection Relays - MELPRO-A Series , MUV
Contact recovery delay after applying voltage

This relay has a capacitor to operate in case of the lost power or at the maximum settling of an operation time. Because this capacitor needs a time to be ch... More Details >>
- No：23734
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , MUV
Combination transformer

That is described as below. (1) By laying ZCTs for two feeders having different loads, detected by one earth fault directional relay. In this case, it i... More Details >>
- No：23724
- Release Date：2018/09/19 17:16
- Update：2018/09/20 14:23
- Category： Protection Relays - MELPRO-A Series , MDG
Combination with other companies' peripheral devices

It is impossible. In Standard JIS C 4609, warranty is covered for combination of peripheral devices and relays. Therefore, combination with other companies’ ... More Details >>
- No：23718
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , MDG
About contact

The contact recovers automatically. More Details >>
- No：23736
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , MUV
Scope of Application

It is impossible. Because the type is to detect by ZCT in an ungrounded system, the sensitivity becomes very high. More Details >>
- No：23727
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , MGR
Short-circuit detection

Overload tolerance of an over current relay is 200 A, 1 second. Adjust CT ratio and others not to input more than 200 A. More Details >>
- No：23711
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , MOC
Movement indicator

It operates. More Details >>
- No：23739
- Release Date：2018/09/19 17:16
- Category： Protection Relays - MELPRO-A Series , COMMON

21-30 of Total 36

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