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Pepperl+Fuchs

Pepperl+Fuchs KCD2-STC-Ex1 SMART Transmitter Power Supply

SKU KCD2-STC-Ex1

In stock

12-month warranty
Free returns within 30 days

Manufacturer: Pepperl+Fuchs
Product No.: KCD2-STC-Ex1
Origin Germany
Product Type: Power Supply Modules
Payment: T/T, Western Union
Weight: 0.1 kg
Dimensions: 12.5 x 119 x 114 mm
Shipping port: Xiamen
Warranty: 12 months

Product Description

Description

The Pepperl+Fuchs KCD2-STC-Ex1 is a 1-channel intrinsically safe isolated barrier designed to power 2-wire SMART transmitters or interface with 2-wire SMART current sources in hazardous locations. Operating on a 24 V DC power supply via terminals or the Power Rail system, it transfers the analog 4 mA to 20 mA field signal across galvanic isolation to the safe area. The device maintains bi-directional digital signal transmission for protocols such as HART and BRAIN, permitting continuous remote parameterization and diagnostic communication with field instrumentation.

Featuring a compact 12.5 mm housing, the KCD2-STC-Ex1 incorporates selectable output modes—current source, current sink, or voltage output—configurable through onboard DIP switches. An internal 250 Ω resistor is accessible via specific terminal connections to establish necessary HART communication loop impedance when control side resistance is insufficient. Additionally, integrated test sockets within the terminals enable direct connection of HART communicators without disrupting loop wiring.

The module is certified up to SIL 2 (SC 3) per IEC/EN 61508 for functional safety applications. It provides galvanic isolation between input, output, and power circuits to ensure signal integrity and safe operations across Zone 0, Zone 1, Zone 2, and Division 1/2 environments.

Features

1-channel isolated barrier for 2-wire SMART transmitters and current sources.
Compact 12.5 mm housing width for high-density DIN rail mounting.
Selectable output modes via DIP switches: current source (4 mA ... 20 mA), current sink (4 mA ... 20 mA), or voltage output (1 V ... 5 V).
Supports bi-directional digital communication for HART and BRAIN protocols.
Integrated 250 Ω HART resistor available between terminals 6 and 8.
Front-panel test sockets built into terminals for HART communicator interface.
Power Rail compatible or terminal supply via 24 V DC.
Functional safety rated up to SIL 2 / SC 3 in accordance with IEC/EN 61508.

Applications

Galvanic isolation and signal conditioning between hazardous area transmitters and safe area control systems (DCS/PLC).
Powering 2-wire SMART process transmitters measuring pressure, level, temperature, or flow.
Interfacing current sources in hazardous locations with standard control system analog inputs.
SIL 2 safety-instrumented functions (SIF) requiring isolated analog input processing.

Technical Specifications

General

Parameter	Specification
Manufacturer	Pepperl+Fuchs
Model	KCD2-STC-Ex1
Signal Type	Analog input
Channels	1-channel
Functional Safety	SIL 2 / Systematic Capability SC 3 acc. to IEC/EN 61508

Supply

Parameter	Specification
Connection	Power Rail or terminals 9+, 10-
Rated Voltage Ur	19 ... 30 V DC
Ripple	<= 10 %
Rated Current Ir	<= 45 mA at 24 V and 20 mA source mode output
Power Dissipation	<= 800 mW
Power Consumption	<= 1.1 W

Input (Hazardous Area)

Parameter	Specification
Connection Side	Field side
Connection Terminals	1+, 2- ; 3+, 4-
Input Signal	4 ... 20 mA limited to approx. 26 mA
Open Circuit Voltage / Short-Circuit Current	Terminals 1+, 2-: 22 V / 26 mA
Voltage Drop	Terminals 3+, 4-: approx. 5 V
Available Voltage	Terminals 1+, 2-: >= 15 V at 20 mA ; >= 18 V at 4 mA

Output (Safe Area)

Parameter	Specification
Connection Side	Control side
Connection Terminals	Terminals 5-, 6+; terminals 5-, 8+ for HART resistor
Source Mode Load	0 ... 350 Ω
Output Signal Source Mode	4 ... 20 mA or 1 ... 5 V (internal resistor: 250 Ω, 0.1 %)
Output Signal Sink Mode	4 ... 20 mA, operating voltage 10 ... 30 V
Ripple	20 mV rms

Transfer Characteristics

Parameter	Specification
Deviation at 20 degC	< 0.1 % of full scale incl. non-linearity and hysteresis (source/sink 4 ... 20 mA)
Deviation at 20 degC (Voltage)	<= +- 0.2 % incl. non-linearity and hysteresis (source mode 1 ... 5 V)
Ambient Temperature Influence (Current)	< 2 uA/K (-20 ... 70 degC); < 4 uA/K (-40 ... -20 degC)
Ambient Temperature Influence (Voltage)	< 0.5 mV/K (-20 ... 70 degC); < 1 mV/K (-40 ... -20 degC)
Frequency Range	Field side into control side: 0 ... 3 kHz (-3 dB, 0.5 Vpp signal)
Frequency Range (Reverse)	Control side into field side: 0 ... 3 kHz (-3 dB, 0.5 Vpp signal)
Settling Time	<= 50 ms
Rise Time / Fall Time	<= 10 ms

Galvanic Isolation

Parameter	Specification
Input / Output	Basic insulation acc. to IEC/EN 61010-1, rated insulation voltage 300 Veff
Input / Power Supply	Reinforced insulation acc. to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output / Power Supply	Basic insulation acc. to IEC/EN 61010-1, rated insulation voltage 300 Veff
Ex Safety Isolation (Input/Output)	Safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Ex Safety Isolation (Input/Power)	Safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V

Mechanical & Environmental

Parameter	Specification
Degree of Protection	IP20
Connection Type	Screw terminals
Mass	Approx. 100 g
Dimensions (W x H x D)	12.5 x 119 x 114 mm (0.5 x 4.7 x 4.5 inch), housing type A2
Mounting	35 mm DIN mounting rail acc. to EN 60715:2001
Ambient Temperature	-40 ... 70 degC (-40 ... 158 degF)

Connections / Interfaces

Terminal	Function
1+	Field Input: 2-wire Transmitter (+)
2-	Field Input: 2-wire Transmitter (-)
3+	Field Input: Current Source (+)
4-	Field Input: Current Source (-)
5-	Control Output (-)
6+	Control Output (+)
8+	Control Output (+) with internal 250 Ω HART resistor
9+	Safe Area Power Supply 24 V DC (+)
10-	Safe Area Power Supply 24 V DC (-)

Installation Guidelines

Ensure the power supply is de-energized before mounting or terminating field wires.
Mount the module vertically on a standard 35 mm DIN rail in a clean, dry, pollution degree 2 environment.
For Zone 2 / Division 2 installations, place the device inside an enclosure providing at least IP54 protection.
Maintain strict physical separation between hazardous area blue field wiring and safe area non-intrinsically safe connections.
Wire 2-wire transmitters to terminals 1+ and 2-, or current sources to terminals 3+ and 4-.
Connect control system analog inputs across terminals 5- and 6+ (or 5- and 8+ if internal HART resistance is needed).
Provide 24 V DC power via terminals 9+ and 10- or directly through the Power Rail system.

Configuration Guidelines

The output operational mode is set via four DIP switches (S1, S2, S3, S4) located on the side of the housing:

Mode of Operation	S1	S2	S3	S4
Current source output 4 ... 20 mA (Default)	II	II	I	II
Voltage source output 1 ... 5 V	II	II	I	I
Current sink output 4 ... 20 mA	II	I	II	II

Note: Change DIP switch positions only when no explosive atmosphere is present.

Commissioning Recommendations

Verify that the front green PWR LED lights up, indicating correct 24 V DC power supply delivery.
Confirm field loop current using an external meter or HART communicator via the integrated test sockets on the terminals.
Validate HART or BRAIN signal pass-through between field device and host DCS/PLC.
For SIL 2 safety applications, record settings and execute full functional proof tests at scheduled operational intervals.

Compliance and Certifications

Certification / Standard	Details
ATEX (Intrinsic Safety)	CESI 06 ATEX 021 X: II (1)G [Ex ia Ga] IIC, II (1)D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I
ATEX (Zone 2)	CESI 19 ATEX 021 X: II 3G Ex ec IIC T4 Gc
IECEx	IECEx CES 06.0001X: [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I, Ex ec IIC T4 Gc
North America	FM 18 CA 0116 X, FM 19 US 0117 X, cULus E106378: Class I, Div 2, Groups A-D T4; Associated apparatus for Class I, II, III Div 1
CCC	2020322316001218: Ex ec [ia Ga] IIC T4 Gc, [Ex ia Da] IIIC
EMC Directive	2014/30/EU, EN 61326-1:2013, NE 21:2017, EN 61326-3-2:2018
ATEX Directive	2014/34/EU, EN IEC 60079-0, EN IEC 60079-11, EN IEC 60079-7

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

What is the primary function of the Pepperl+Fuchs KCD2-STC-Ex1?

The Pepperl+Fuchs KCD2-STC-Ex1 is a 1-channel intrinsically safe isolated barrier that supplies power to 2-wire SMART transmitters or interfaces with current sources in hazardous areas, transferring isolated 4-20 mA or 1-5 V signals to safe area control systems.

How are the output modes configured on the KCD2-STC-Ex1?

The module uses four side-mounted DIP switches to select between current source mode (4-20 mA), current sink mode (4-20 mA), or voltage source output mode (1-5 V).

Does the KCD2-STC-Ex1 support HART digital communication?

Yes, the device allows bi-directional HART and BRAIN communication signals to pass through. It also features an internal 250 ohm HART resistor accessible via terminal 8 and front test sockets for communicator connection.

What power supply options can be used with the KCD2-STC-Ex1?

The module operates on 19 to 30 V DC power, which can be supplied either through screw terminals 9+ and 10- or via the Pepperl+Fuchs Power Rail system.

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