MH Protection Relays

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About MTB Fault Indication System MTB, or Mechanical Trip Button is a fault indication system incorporated in advanced protection relaying for electrical power networks. The MTB does not require auxiliary supply to provide a fault indication. The MTB is designed to prevent power circuits from re-energising before a fault is completely rectified. This is an essential safety feature which protection relays using electrical latching mechanisms are not able to provide .

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Detection of very small current  Compact Construction  Suitable for MH Earth Leakage Relay  Operating temperature: -20°C … 65°C  Insulation Resistance: DC500V / 100MΩ min  Transformation ratio: 1,150 / 1 A  Current transformer as per IEC 60044-1  Leakage current range: 10mA … 30000mA  Internal Diameter: Ø35mm, Ø50mm, Ø70mm, Ø105mm, Ø140mm

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The EL 03D and EL 30D is a digital earth leakage relay for DIN rail mounting. The advanced design meets IEC60755 Type-A & AC operation to accurately deduce the leakage current level in network with high harmonics loads content. It provides real-time communication via Modbus-RTU protocol to Building Monitoring System / Energy Management System network and 2-Contacts Output to support traditional management system.

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