- Cost optimized design Economical separation for standard applications
- Only 60 mm installation depth, 11.2 mm wide Can be installed in economical standard terminal boxes
- Galvanic isolation across input and output Protection against erroneous measurements due to parasitic voltages or ground loops
- Protective Separation acc. to EN 61140 Protects service personnel and downstream devices against impermissibly high voltage
- No power supply required Saving costs since wiring is reduced and line influences are omitted
- 5 Years Warranty Defects occurring within 5 years from delivery date shall be remedied free of charge at our plant (carriage and insurance paid by sender)
 Datasheet |
| User Manual |
- Universal operation of Transmitters Energization and separation of field located 2-, 3- and 4-wire transmitters with current or voltage output
- Calibrated signal setting Input and output range can be set by using DIP switch – high precision without any further adjustment
- 3-Port isolation Protection against erroneous measurements due to parasitic voltages or ground loops
- Extremely slim design 6.2 mm slim housing for a simple and space saving DIN rail mounting
- Optional In-Rail-Bus mounting rail connector allows for fast and economical installation
- Protective Separation acc. to EN 61140 Protects service personnel and downstream devices against impermissibly high voltage
- 5 Years Warranty Defects occurring within 5 years from delivery date shall be remedied free of charge at our plant (carriage and insurance paid by sender)
| Datasheet |
| Ex and UL instructions |
| User Manual |
- Universal operation of SMART Transmitters Energization and separation of field located 2-, 3- and 4-wire transmitters
- Bidirectional HART transmission HART data transfer for repeater and isolator operation
- 3-Port isolation Protection against erroneous measurements due to parasitic voltages or ground loops
- Extremely slim design 6.2 mm slim housing for a simple and space saving installation
- Optional In-Rail-Bus mounting rail connector allows for fast and economical installation
- Protective Separation acc. to EN 61140 Protects service personnel and downstream devices against impermissibly high voltage
- 5 Years Warranty Defects occurring within 5 years from delivery date shall be remedied free of charge at our plant (carriage and insurance paid by sender)
| Datenblatt |
| Ex- und UL-Anweisungen |
| Bedienungsanleitung |
Power-Feed Isolators / Signal Feed-through Converters
A power-feed isolator supplies two- or multi-wire transmitters with the necessary power and at the same time provides galvanic isolation between the field side and the control side. This ensures clean isolation of process signals — typically 4 … 20 mA — and prevents interference, ground loops or potential shifts. Power-feed isolators are often implemented as compact DIN-rail modules, making them suitable for control panels where active sensors or transmitters must be powered and their signals reliably transmitted to controllers, indicators or DCS.
Questions & Answers on Power-Feed Isolators
What is a power-feed isolator?
A power-feed isolator is a device that supplies power to a sensor or transmitter and at the same time ensures galvanic separation between input and output circuits.
Which sensors or signals can be used with a power-feed isolator?
Typically sensors or transmitters with 4 … 20 mA output — including 2-, 3- or 4-wire transmitters — are powered and their output signals are transmitted galvanically isolated.
Why is galvanic isolation important in power-feed isolators?
Galvanic isolation prevents ground loops, potential differences and electromagnetic interference between field and control circuits, improving signal integrity and system reliability.
When is a power-feed isolator used instead of direct sensor supply?
Whenever the field side and the control side must remain electrically isolated — e.g., over long cable runs, with different ground potentials, or when noise immunity and safety are required.
How is the power-feed isolator supplied?
The isolator itself requires an auxiliary supply (commonly 24 V DC or a specified supply range) to power the transmitter and enable galvanically isolated signal forwarding.
Does a power-feed isolator affect signal quality?
No — a properly designed isolator transfers the measurement signal without distortion and with high precision, while protecting against interference and ground-loop effects.
How is wiring done in a control cabinet?
The isolator is mounted on a DIN rail. The sensor/transmitter is connected to the input side, and the isolated standardized output signal is routed to the control system or monitoring devices.
Can power-feed isolators support smart transmitters with HART communication?
Yes — certain isolators support active HART transmitters and preserve bidirectional HART communication across the galvanic barrier.
When is a power-feed isolator particularly useful?
Whenever active transmitters with power supply and galvanic isolation are required — for example in industrial process measurement and control systems, or when HART devices must be integrated reliably and interference-free.
What are the advantages of using a power-feed isolator?
They simplify installation by combining transmitter power supply and signal isolation, ensure galvanic isolation, reduce interference and facilitate modular DIN-rail cabinet designs.
Are there downsides or limitations to power-feed isolators?
The main drawback is the need for an auxiliary power supply. For simple passive sensors or basic current loops, a basic isolator or passive converter might be more cost-effective.
For which applications are power-feed isolators ideal?
They are ideal for industrial automation where active sensors or transmitters are used, galvanic isolation and signal integrity are required, and space-efficient DIN-rail solutions are desired.
How compact are typical power-feed isolators?
Many are designed with narrow housings suitable for DIN-rail mounting, requiring minimal space — beneficial for densely populated control cabinets.