Bender IRDH275B-427 Insulation Monitoring Device B91065105

The ISOMETER® of the IRDH275 series is designed to monitor the insulation resistance of unearthed main circuits (IT systems) AC, AC/DC 0…793 V resp. DC 0…650 V.

The AMPPlus measurement method meets the particular requirements of modern power supplies which often include rectifiers, converters, thyristor-controlled DC drives and directly connected DC components.

 In these systems often high leakage capacitances against earth occur due to interference suppression measures.

The IRDH275 automatically adapts itself to the existing system conditions.

Insulation monitoring for unearthed AC, AC/DC systems 0…793 V, DC 0…650 V

Nominal voltage extendable via coupling device

Two separately adjustable response values1 kΩ…10 MΩ

Rated insulation voltage :-  AC 800 V

Rated impulse voltage/pollution degree :- 8 kV/3

Nominal frequency fn :- 0,1…460 Hz

Nominal system voltage Un :- DC 0…650 V

Supply voltage US (also see nameplate) :- AC 19.2…55 V

Frequency range US :-  42…460 Hz

Supply voltage US :- DC 19.2…72 V

Power consumption :- ≤ 14 VA

Response value Ran1 :-  1 kΩ…10 MΩ

Measuring voltage Um:-  ≤ 50 V

Measuring current Im (at RF = 0 Ω) :-  ≤ 280 μA

Internal DC resistance Ri :- ≥ 180 kΩ

Operating uncertainty (1…20 kΩ) :- ± 1 kΩ/± 15 %

Operating uncertainty (1…10 MΩ) :-  ± 0.1 MΩ/± 15 %

Display range measured value :- 1 kΩ…10 MΩ

Cable length :- ≤ 1200 m

Terminating resistor  :- 120 Ω (0.5 W)

Rated contact voltage  :- AC 250 V/DC 300 V

Making capacity :- AC/DC 5 A

Breaking capacity  :- 2 A, AC 230 V, cos phi = 0.4 0.2 A, DC 220 V, L/R = 0.04 s

Contact rating at DC 24 V:-  ≥ 2 mA (50 mW)

Ambient temperature (during operation) :-  -10…+55 °C

Ambient temperature (during storage) :- -40…+70 °C

rigid/flexible:-  0.2…4 mm²/0.2…2.5 mm²

flexible with ferrules without/with plastic sleeve :-  0.25…2.5 mm²

Tightening torque :- 0.5 Nm

Conductor sizes (AWG) :- 24…12

Degree of protection, internal components :- IP30

Degree of protection, terminals :- IP20

Vibration resistance :-  1.6 mm/10…25 Hz 4 g/25…150 Hz

Ambient temperature (during operation) :-  -40…+70 °C

Storage temperature range :- - 40…+85 °C