The Pepperl+Fuchs KFD2-STC4-Ex2, also cataloged as the KFD2-STC4-Ex2 Smart Transmitter Power Supply, operates as a dedicated hardware component for galvanic isolation and intrinsically safe power supply to 2-wire SMART transmitters within hazardous area field networks.

Technical Performance Matrix

Intrinsic Safety and Isolation Parameters

The module incorporates certified intrinsically safe (Ex i) barriers designed to limit electrical energy delivered to hazardous location field devices. Galvanic isolation prevents ground loops and voltage spikes between the hazardous field circuits, power supply rail, and non-hazardous control system I/O. The internal current-limiting components maintain safety limits under fault conditions up to Ex ia IIC standards, preventing spark ignition in flammable gas or dust atmospheres.

Delivery Specifications

• Delivery time: 3-5 days when payment finish
• Fast dispatch via DHL, FEDEX, or UPS international freight
• Dispatched in heavy-duty anti-static industrial packaging with impact-resistant padding

Site Mounting and Electrical Wiring

DIN-Rail Assembly

• Mount vertically onto standard 35 mm DIN mounting rail (EN 60079-15) or integrate via Power Rail system.
• Maintain a minimum clear spacing of 50 mm above and below the module for natural thermal convection.

Field Wiring & Earthing

• Separate hazardous (Ex i) blue terminals from non-hazardous control terminals by at least 50 mm space distance or via partition plates.
• Connect field transmitter wiring using twisted-shielded cable pairs. Terminate cable shields to dedicated grounding points at the control cabinet entry ground bar.

Ordering Information

• Primary Order Reference: KFD2-STC4-Ex2
• Package Contents: 1x KFD2-STC4-Ex2 isolated transmitter power supply module, 1x terminal plug set, 1x quick setup instruction sheet.
• Optional Accessories: Power Rail UPR-03, Power Feed Module KFD2-EB2.

Technical Query Resolution

Q: Does the KFD2-STC4-Ex2 support bi-directional HART signal communication?

A: Yes, the unit transmits HART communication signals bidirectionally between the 4-20 mA SMART field transmitters and the control system terminals.

Q: What is the maximum voltage peak rating for the galvanic isolation barrier?

A: The safe galvanic isolation between field circuits and control/power circuits is rated for a peak voltage test value of 375 V according to EN 60079-11.

Q: Can the unit be powered directly from the standard terminal blocks instead of the Power Rail?

A: Yes, power can be supplied either via the Power Rail bus system or directly using screw/spring terminals 14+ and 15-.

Q: How does the channel density affect power distribution across adjacent modules?

A: The module dissipates a maximum of 1.8 W. When installing multiple units adjacently without spacing, verify total power dissipation within the enclosure to remain under the max operating limit of +60 deg C.