Dold Insulation Monitoring Relay, SPDT, 0.8 → 1.1 V, DIN Rail

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£373.27

(exc. VAT)

£447.92

(inc. VAT)

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RS Stock No.:
240-9049
Mfr. Part No.:
AI898 DC24V 6kOhm UH=AC45-400Hz 230V
Brand:
Dold
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Brand

Dold

Monitoring Application

Insulation

Voltage Sensing Range

0.8 → 1.1 V

Contact Configuration

SPDT

Mounting Type

DIN Rail

Time Delay

0.4s

Series

AI 898

Operating Temperature Range

+60°C

Length

115mm

Height

77mm

Minimum Operating Temperature

-20°C

Dimensions

115 x 45 x 77mm

Maximum Operating Temperature

+60°C

Width

45mm

COO (Country of Origin):
DE

Insulation monitor for direct current networks, AI898


Fixed response time 6 kΩ
LED display for operational readiness and earth fault
1 changeover
Overall width 45 mm

The AI898 insulation monitor displays the insulation resistance of unearthed direct current networks to earth. It does not detect symmetrical earth faults. In practice, these faults are generally insignificant.
The AI898 works on the quiescent current principle, for example when the auxiliary voltage is applied to terminals A1 → A2 the output relay is activated and the "ON" LED indicates that the insulation resistance RAN is not less than the minimum value. If insulation resistance falls below the response value, the output relay drops, the "ON" LED goes out and the second LED for "Earth fault" lights up.
A bridge between terminals LT1 and LT2 (inserted as standard) allows the AI898 to be programmed for memory storage behaviour; remove the bridge to programme hysteresis behaviour. The bridge can be replaced with a delete key with an NC contact. A test key (PT) tests the functional efficiency of the device (as per VDE 0435).

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