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IRDH275  Digital ground fault monitor / ground detector

This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded AC systems, as well as the upcoming 2014 requirement of NEC 250.167(A) for ungrounded DC systems.

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Essential details：IRDH275  Digital ground fault monitor / ground detector

This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded AC systems, as well as the upcoming 2014 requirement of NEC 250.167(A) for ungrounded DC systems.
The IRDH275 monitors for ground faults in ungrounded single-phase AC, three-phase AC, and DC systems by monitoring the system’s insulation resistance. It may be connected to systems of up to 793 VAC / 650 VDC. Voltage coupler accessories extend this range. The AMP Plus measuring principle utilized by the IRDH275 meets the requirements of modern power systems, including pure DC systems, systems with rectifiers, and systems with variable frequency drives (VFDs). In systems with high leakage capacitances, the IRDH275 automatically adapts itself to ensure an accurate reading.
The IRDH275 features a digital display showing the system’s insulation resistance’in real-time. All settings are changed via the device’s built-in menu. The IRDH275 utilizes an external supply voltage for power, which allows deenergized systems to also be monitored.
For a panel mounted version, please refer to the IRDH375.

IRDH275B-435 

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IRDH275  Digital ground fault monitor / ground detector

When the insulation resistance from system to ground falls below the set response value, the alarm relays switch and the alarm LEDs activate. Two separately adjustable alarmcontacts can be set to a prewarning and main warning alarm. The measured value is indicated on the LCD display or an externally connectable measuring instrument. A latching setting (“fault memory”) allows the device to reset automatically or require a manual reset. An external and internal test/reset can be activated remotely or on the device. A comprehensive INFO menu displays additional information such as the system’s leakage capacitance.
The IRDH275 continuously monitors the equipment ground connection to ensure proper operation. The device’s easy-to-use onboard menu manages all settings via the detailed LCD screen.

• History memory with real-time clock to store up to 300 timestamped event records
• Galvanically isolated RS-485 interface (BMS protocol) for data exchange with other Bender devices and communication systems
• Standby contacts and RS-485 communication for operating multiple ground fault detectors in systems tied together with tiebreakers or interlocks
• Galvanically isolated analog output, 0(4 ) – 20 mA

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