The A-ISOMETER® of the IR420 series is designed to monitor the insulation resistance of AC control circuits (IT systems) 0…300 V. If the systems to be monitored include DC components, such as switched-mode power supplies or solenoid valves, the display and operating characteristics may be affected. The display and response values apply to pure AC systems. An external supply voltage allows de-energized systems to be monitored too.

The A-ISOMETERs® of the IR125Y series are designed to monitor the insulation resistance of unearthed DC control circuits (IT systems) DC 19.2…308 V. External supply voltage is not required.
In contrast to insulation monitoring device which evaluate the shift voltage for insulation fault detection, this series uses the active AMP measuring principle. This creates the possibility to detect and indicate both symmetrical and asymmetrical insulation faults.

The A-ISOMETER® of the IR425 series is designed to monitor the insulation resistance of unearthed AC/DC control circuits (IT systems) 0…300 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.

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

The A-ISOMETER® of the IR1575 series is designed to monitor the insulation resistance of unearthed main circuits (IT systems) AC, AC/DC 30…480 V resp. DC 0…480 V. The AMP measuring principle allows the Isometers to be used in systems with directly connected DC components. The IR1575 automatically adapts itself to the existing system leakage capacitances. An external supply voltage allows de-energized systems to be monitored too.

The A-ISOMETER® of the IRDH575 series monitors the insulation resistance of unearthed power supplies (IT systems). It is suitable for universal use in 3(N)AC, AC/DC and DC systems. AC systems may include extensive DC-supplied loads, such as converters or thyristor-controlled DC drives. The IRDH575, the insulation fault evaluators of the EDS4… series and the appropriate measuring current transformers can be combined to an insulation fault location system.

The special extra for increasing the reliability of your electrical installations In order to achieve high reliability and to avoid costly shut-down periods of electrical installations, it is necessary to recognize insulation faults at an early stage – before interruption to operation occurs. For this reason, unearthed systems (IT systems) with insulation monitoring are used for the power supply of essential electrical installations and loads. The A-ISOMETER® provides the necessary advance information. Fast localisation and elimination of insulation faults is required by DIN VDE 0100-410 (VDE 0100-410): 2007-06 chapter 411.6.3.1 and IEC 60364-4-41 chapter 413.1.5.4 "It is recommended that a first fault be eliminated with the shortest practivable delay". The EDS system is a modular system ideally suited for this task. There is a variety of application fields for EDS systems.


They are used for main circuits and control circuits for example in power plants, hospitals, shipbuilding, traffic engineering, industrial plants, paper industry, oil and natural gas industry, mining, open-cast mining, rolling mills, mechanical engineering, and in a lot of other sectors.


Example of application:

The insulation fault evaluator of the EDS460/490 series in combination with the A-ISOMETER® IRDH575 or the insulation fault test device PGH is designed to localize insulation faults in unearthed power supplies (IT systems). The test current signals generated by the insulation monitoring device IRDH575 or the insulation fault test device PGH are scanned by measuring current transformers and evaluated by the insulation fault evaluators.

The insulation fault evaluator of the EDS460/490 series in combination with the A-ISOMETER® IRDH575 or the insulation fault test device PGH is designed to localize insulation faults in unearthed power supplies (IT systems). The test current signals generated by the insulation monitoring device IRDH575 or the insulation fault test device PGH are scanned by measuring current transformers and evaluated by the insulation fault evaluators.

The insulation fault evaluator of the EDS460/490 series in combination with the A-ISOMETER® IRDH575 or the insulation fault test device PGH is designed to localize insulation faults in unearthed power supplies (IT systems). The test current signals generated by the insulation monitoring device IRDH575 or the insulation fault test device PGH are scanned by measuring current transformers and evaluated by the insulation fault evaluators.

The insulation fault evaluator of the EDS460/490 series in combination with the A-ISOMETER® IRDH575 or the insulation fault test device PGH is designed to localize insulation faults in unearthed power supplies (IT systems). The test current signals generated by the insulation monitoring device IRDH575 or the insulation fault test device PGH are scanned by measuring current transformers and evaluated by the insulation fault evaluators.

The IT system distribution cabinets of the TR-VITCF series supply electrical power to group 2 medical locations, e.g. intensive care units. For
• socket-outlet circuits for medical electrical equipment and
• operating theatre luminaires circuits and similar lighting
supplied with nominal voltages exceeding AC 25 V or DC 60 V, the protective measure “Protection by insulation monitoring with indication in the IT system” is mandatory.

The IT system distribution cabinet in the IPS-F series supply electrical power to group 2 medical locations. In such locations, according to the requirements of
• IEC 60364-7-710
for circuits supplying medical electrical Equipment and systems intended for life support, surgical applications and other electrical equipment located in the “patient environment”

The IT system distribution boards in the IPS series supply electrical power to group 2 medical locations.In such locations, according to the requirements of
• IEC 60364-7-710
for circuits supplying medical electrical equipment and systems intended for life support, surgical applications and other electrical equipment located in the “patient environment“

The universal remote alarm indicator and test combination MK2430 is intended for visual and audible indication of operating status and alarm messages from Bender systems such as EDS, RCMS and MEDICS. In MEDICS monitoring systems, the MK2430 meets the requirements of IEC 60364-7-710 in respect of test functions for IT system monitoring and messages from changeover modules.

The universal MK800 remote alarm indicator and test combination is used for
• indication and visualization of operating status and alarm messages;
• central operation and parameter setting of BMS bus devices;
• indication and visualization of operating status and alarm messages;
• displaying measured values and setting of response values for monitoring purposes
from Bender monitoring systems with BMS-bus capability, such as MEDICS, RCMS or EDS.

The factory-made modules of the UFC107E series are used to change over (t ≤ 0.5 s) between two supply sources (AV/SV resp. SV/UPS) and for IT system monitoring in medical locations. The UFC107E features an insulation fault location system to localize insulation faults in 6, 12, 18 or 24 outgoing circuits during operation. Each outgoing circuit has a two-pole circuit breaker. Status indication and alarm texts on the alarm indicator and operator units takes place via bus technology. The module is suitable for mounting onto all common DIN rail systems (equipment racks have to be provided by the customer).

The factory-made modules of the UMC107E series are used to change over (t ≤ 0.5 s) between two supply sources (AV/SV resp. SV/UPS) and for IT system monitoring in medical locations. Status indication and alarm texts on the alarm indicator and operator units takes place via BMS bus. The module is suitable for mounting onto all common DIN rail systems (equipment racks have to be provided by the customer).

The factory-made modules of the LFC107E series are used to monitor IT systems in medical locations. The LFC107E features an insulation fault location system to localize insulation faults in 6, 12, 18 or 24 outgoing circuits during operation. Each outgoing circuit has a two-pole circuit breaker. Status indication and alarm texts on the alarm indicator and operator units takes place via bus technology. The module is suitable for mounting onto all common DIN rail systems (equipment racks have to be provided by the customer).

The factory-made modules of the LTIC107 series are designed for monitoring single-phase (LTIC107E) or three-phase (LTIC107D) IT systems in medical locations. Status indication and alarm texts on the alarm indicator and operator units takes place via bus technology. The module is suitable for mounting onto all common DIN rail systems (equipment racks have to be provided by the customer).

The transformers of the ES710 series have reinforced insulation and comply with the requirements of IEC 61558-1 / DIN EN 61558-1 (VDE 0570-1) and IEC 61558-2-15 / DIN EN 61558-2-15 (VDE 0570-2-15).

The transformers of the ESL0107 series have reinforced insulation and comply with the requirements of IEC 61558-2 -6 / DIN EN 61558-2-6 (VDE 0570-1). The transformers are fitted with tapping points for fine-step voltage adaptation on the primary and secondary side and thus meet the requirements for power supplies of operating theatre luminaires in Group 2 rooms. The windings are galvanically isolated.

The protocol converter FTC470XET is designed to be used as Ethernet gateway with web server. It converts data from the BMS bus into TCP/IP protocol (Ethernet). In this way, data from BMS systems can be displayed on a personal computer via a web browser. Additional software need not to be installed.

The protocol converter FTC470XMB is designed to transmit data from the BMS bus to the Modbus RTU and vice versa. In this way, information from communication-capable Bender products, such as EDS, RCMS or MEDICS® systems can be integrated into a Modbus RTU system. Programming and adaptations on the Modbus RTU side have to be carried out by the user. In mode 1, up to 10 BMS-compatible Bender devices can be displayed with one FTC470XMB.

The AC and pulsed DC sensitive residual current monitor RCM420-D (Type A) is designed for fault and residual current monitoring in earthed power supply systems (TN and TT systems) where an alarm is to be activated in the event of a fault, but disconnection must be prevented.

The AC / DC sensitive residual current monitor RCMA420 is designed for monitoring earthed power supply systems (TN and TT systems) where DC fault currents or residual currents continuously greater than zero may occur. These are in particular loads containing six-pulse rectifiers or one way rectifiers with smoothing, such as converters, battery chargers, construction site equipment with frequency-controlled drives. Currents in single conductors can be monitored too.

The AC / DC sensitive residual current monitor RCMA423 is designed for monitoring earthed power supply systems (TN and TT systems) where smooth DC fault currents or residual currents continuously greater than zero may occur. These are in particular loads containing six-pulse rectifiers or two-pulse rectifiers with smoothing, such as converters, battery chargers, construction site equipment with frequency-controlled drives. Currents in single conductors can also be monitored by RCMA423.

The RCMS system consists of one or several RCMS460-D / -L or RCMS490-D / -L residual current evaluators, which are able to detect and evaluate fault, residual and operating currents in earthed power supplies via the associated measuring current transformers. The maximum voltage of the system to be monitored depends on the nominal insulation voltage of the measuring current transformers used in case of busbar systems, or on the cables or conductors that are routed through.

The RCMS system consists of one or several RCMS460-D / -L or RCMS490-D / -L residual current evaluators, which are able to detect and evaluate fault, residual and operating currents in earthed power supplies via the associated measuring current transformers. The maximum voltage of the system to be monitored depends on the nominal insulation voltage of the measuring current transformers used in case of busbar systems, or on the cables or conductors that are routed through.

The RCMS system consists of one or several RCMS460-D / -L or RCMS490-D / -L residual current evaluators, which are able to detect and evaluate fault, residual and operating currents in earthed power supplies via the associated measuring current transformers. The maximum voltage of the system to be monitored depends on the nominal insulation voltage of the measuring current transformers used in case of busbar systems, or on the cables or conductors that are routed through.

The RCMS system consists of one or several RCMS460-D / -L or RCMS490-D / -L residual current evaluators, which are able to detect and evaluate fault, residual and operating currents in earthed power supplies via the associated measuring current transformers. The maximum voltage of the system to be monitored depends on the nominal insulation voltage of the measuring current transformers used in case of busbar systems, or on the cables or conductors that are routed through.