The IR420-D4-2 is an insulation monitoring device from Bender, designed for unearthed AC control circuits (IT systems). It continuously monitors the insulation resistance of AC 0…300 V systems and issues an alarm signal when the insulation value falls below a preset threshold, ensuring the safety of control circuits. DC components present in AC systems do not affect the device‘s response characteristics.
Technical Specifications
· Rated system voltage (Uₙ): AC 0…300 V, 42…460 Hz
· Supply voltage (Uₛ): AC/DC 70…300 V
· Response value range: 1 kΩ … 200 kΩ, two independently adjustable thresholds
· Maximum permissible system leakage capacitance: ≤ 20 μF
· Alarm relays: Two independent changeover contacts, AC 250 V / 5 A
· Connection type: Push-wire terminals
· Operating temperature: –10 °C … +55 °C
· Dimensions (W × H × D): 36 × 71 × 90 mm
· Weight: Approx. 150 g
· Standards compliance: IEC 61557‑8, DIN EN 61557‑8
· Order number: B71016405
Key Features
· AMP measuring principle – Uses Bender‘s AMP measuring technology; the device superimposes a pulsating measuring voltage onto the monitored IT system and detects ohmic insulation faults through a closed measuring circuit
· Two independently adjustable alarm response values – Response value range from 1 kΩ to 200 kΩ, allowing separate pre-warning and main alarm settings
· Multi‑function LCD display – Shows real‑time insulation resistance values, alarm information, and device parameters
· LED status indicators – Power On, Alarm 1, Alarm 2
· Connection monitoring – Continuously monitors measuring leads and earth connection status
· Built‑in self‑test – Continuously verifies internal measuring circuits; automatically alarms on fault detection
· External test and reset – Supports connection of external test and reset push‑buttons
· Selectable fault memory – When activated, alarm status remains until manually reset
· Adjustable response delay – Prevents nuisance alarms caused by system transients
· Password protection – Prevents unauthorised parameter changes
· Sealable transparent cover – Prevents unauthorised parameter modification
· De‑energised system monitoring – Monitors the system even when the main circuit is de‑energised
· Push‑wire terminals – Gas‑tight, vibration‑resistant connections requiring no regular screw tightening
Typical Applications
· Industrial control circuits
· Power plant automation
· Elevator systems
· Small AC IT systems
· AC auxiliary circuits
· Automation systems
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