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Help CenterBender IRDH275B-435 Insulation Monitor – Continuous Insulation Monitoring for IT (unearthed) Power Systems
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Warranty period: 365 days
Delivery: 1 week for in-stock; no more than one month at the latest
Payment: 50% advance payment, full payment for delivery
Express options: FedEx, UPS, DHL
Continuous insulation monitoring (IT systems) – Detects insulation drop before it becomes a ground fault, helping avoid unexpected shutdown.
AC/DC and mixed systems – Monitors variable-speed drive systems, rectifiers, battery DC buses, and modern mixed networks reliably.
Two-step alarming (prewarning/alarm) – Adjustable response values with two relay outputs for staged maintenance actions.
Robust measurement principle – Bender’s AMP-style measuring method typically provides stable readings even with system leakage capacitance.
BMS (RS‑485) connectivity – Integrates with Bender’s BMS network and supports connection to insulation fault location systems (EDS) in many cases.
Self-monitoring and test/reset – On-device TEST/RESET functions and watchdogs improve diagnostic confidence.
Front-panel mounting – 96 × 96 mm format makes retrofits straightforward on standard control panel doors.
| Brand / Model | Bender IRDH275B-435 (Insulation Monitoring Device / ISOMETER) |
| HS Code | 9030.39 — Instruments for measuring/checking electrical quantities (no recording device) |
| Power Requirements | Wide-range supply, typically 85–264 V AC or 90–300 V DC |
| Dimensions & Weight | Front 96 × 96 mm; panel cut-out ~92 × 92 mm; depth approx. 75–100 mm; weight ~0.5 kg |
| Operating Temperature | -10 °C to +55 °C (typ.) |
| Signal I/O Types | 2× alarm relays (SPDT, prewarning/alarm), TEST/RESET input; measuring connection to system conductors and PE |
| Communication Interfaces | BMS (RS‑485) for Bender system integration; supports EDS insulation fault location connection in many cases |
| Installation Method | Panel-mounted (96 × 96 mm); optional DIN-rail with adapter where applicable |
| Typical System Types | Unearthed AC, DC, and AC/DC IT systems; higher voltages via matching Bender AGH coupling devices |
You might notice that the IRDH275B-435 fits best where uptime matters and selective fault location is desired:
Drives and automation panels in process plants (VFD-heavy AC networks)
Battery-backed DC buses, energy storage, and UPS-backed IT systems
Mining, marine, and rail applications using unearthed supplies
Power conversion skids, rectifiers, and PV inverters operating as IT networks
Laboratory and test benches where isolation monitoring is mandatory
Reliability – Stable measurement under system leakage capacitance and harmonic noise; fewer nuisance trips.
Compatibility – Works across AC/DC/mixed IT networks; integrates with Bender BMS and EDS for scalable fault location.
Cost savings – Early detection reduces downtime and helps plan maintenance when it’s least disruptive.
Drop-in retrofit – The 96 × 96 mm window is common; typically minimal panel rework.
Technical support – From parameter suggestions to bus integration tips, we can help speed up commissioning.
Panel and environment – Mount on a flat, ventilated control panel door; observe IP requirements; avoid condensation and vibration where possible.
Wiring – Connect measuring leads to the IT system conductors and PE as per Bender’s terminal diagram. Keep signal wiring short and separated from high-frequency drive cables.
System voltage – For higher nominal voltages, use the appropriate Bender AGH coupling device; this is a common oversight in upgrades.
Alarms – Set prewarning and alarm thresholds based on your insulation baseline; many sites start with a conservative prewarning to trend behavior first.
Routine checks – Run periodic TEST; verify relay actions; clean the front panel to keep the display/indicators readable. Firmware updates may be applicable in some variants—schedule during planned downtime.
Safety – De-energize circuits before terminal work. Follow lockout/tagout and local electrical codes.
CE marked; RoHS compliant; manufacturer operates under ISO 9001 quality management
UL/cUL compliance is typically available for this family; specific file numbers vary by variant
Manufacturer’s standard warranty policy applies; our supply warranty is 365 days as stated above
A quick note from a customer in a compressor plant: “After swapping to IRDH275, nuisance alarms disappeared and we finally caught a cable nick before it took down the line.” That seems to be the typical benefit—better signal, fewer surprises.
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