The IR420-D6W-1 is an offline insulation monitoring device from Bender, designed to monitor loads that are temporarily disconnected or permanently de‑energised. It is used for critical equipment such as fire pumps, elevator motors, emergency generators, and slide valve drives, continuously monitoring insulation resistance during shutdown periods to prevent insulation faults caused by moisture from tripping protective devices or damaging equipment upon restart.
The device complies with IEC 61557‑8 and is suitable for TN, TT and IT systems.
Technical Specifications
· Rated system voltage (Uₙ): offline (de‑energised loads)
· Supply voltage (Uₛ): DC 9.6…94 V / AC 16…72 V, 42…460 Hz
· Response value range (Rₐₙ₁ / Rₐₙ₂): 100 kΩ…10 MΩ (two independently adjustable thresholds)
· Response time (tₐₙ): ≤ 4 s (at R_F = 0.5 × Rₐₙ, Cₑ = 1 μF)
· Max. permissible system leakage capacitance (Cₑ): ≤ 10 μF
· Measuring voltage (Uₘ): ±12 V
· Max. measuring current (Iₘ): ≤ 10 μA
· Power consumption: ≤ 3 VA
· Alarm output: Two independent changeover contacts (SPDT), AC 250 V / 5 A
· Display: Multi‑function LCD display
· Protection class: Internal components IP30, terminals IP20
· Mounting: 35 mm DIN rail
· Operating temperature: –25 °C … +55 °C
· Standards compliance: IEC 61557‑8, DIN EN 61557‑8
· Order number: B91016415W (screw‑type terminals)
Key Features
· Continuous insulation monitoring of de‑energised loads
· Two independently adjustable alarm thresholds (100 kΩ…10 MΩ)
· ±12 V DC superimposed measuring voltage
· Automatic self‑test (on power‑up and every 24 hours thereafter)
· Selectable fault memory
· Built‑in TEST/RESET button on front panel; supports external push‑buttons for remote operation
Typical Applications
· Fire protection systems: fire pumps, automatic extinguishing system pumps
· Emergency equipment: emergency generators, emergency drives
· Industrial equipment: slide valve drives (gas, water, oil), hoist motors
· Marine applications: shipboard cranes, anchor chain drives
· Building facilities: elevator motors, smoke damper drives
· Insulation monitoring of de‑energised supply cables and conductors
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