Pepperl+Fuchs KFD2-EB2.R4A.B Redundant Power Feed Module

Pepperl+Fuchs KFD2-EB2.R4A.B Redundant Power Feed Module

Product Introduction

The Pepperl+Fuchs KFD2-EB2.R4A.B redundant power feed module secures your power supply architecture. This device connects directly to the Power Rail. It supports two independent input channels for true redundancy. Meanwhile, the module outputs a maximum current of 4A. You can use it in normal and hazardous environments thanks to its Ex nA nC IIC T4 rating.

Technical Specifications

Rated voltage: 20 ... 30 V DC.
Maximum rated operating voltage: Do not exceed the limit of devices plugged onto the Power Rail.
Power dissipation: ≤ 2.4 W.
Supply output current: 4 A max.
Connection terminals: Two independent feeds – terminals 11+ and 12-; additionally terminals 8+ and 9-.

Fault signal output: Relay output with NO (normally open) contact.
Contact loading capacity: 30 V AC at 2 A (cos φ ≥ 0.7); or 40 V DC at 2 A.
Energized delay: Approximately 20 ms.
De-energized delay: Approximately 20 ms.

Directive conformity (EMC): EN 61326-1:2013 for industrial locations.
EMC standard compliance: NE 21:2006.
Degree of protection (IEC 60529): IP20.

Hazardous Area Approvals

The KFD2-EB2.R4A.B carries multiple international certifications.

• ATEX: II 3G Ex nA nC IIC T4 (TUV 00 ATEX 1618 X).

• IECEx: Ex nA nC IIC T4 Gc (IECEx UL 16.0051X).

• FM approval: Class I, Division 2, Groups A, B, C, D; also Class I, Zone 2, IIC.

• UL approval: Same Div 2 and Zone 2 ratings.

• CSA approval: Class I, Division 2, Groups A, B, C, D; plus Zone 2, IIC.

Mechanical and Environmental Data

Ambient temperature range: -20 °C to 60 °C (-4 °F to 140 °F).
Degree of protection: IP20.
Mounting type: 35 mm DIN mounting rail per EN 60715:2001.
Dimensions: 2 x 11.9 x 11.5 cm (0.8 x 4.7 x 4.5 inches). Housing type B2.
Weight: 0.1 kg (0.22 lbs).

Installation Guidelines

First, mount the Pepperl+Fuchs KFD2-EB2.R4A.B on a standard 35 mm DIN rail. Then connect the primary power source to terminals 11+ and 12-. Next, connect the secondary (redundant) source to terminals 8+ and 9-.

For fault monitoring, wire the relay NO contact to your control system. Furthermore, ensure the total load does not exceed 4A continuous. The module automatically selects the higher input voltage. Finally, verify that no device on the Power Rail exceeds its maximum rated operating voltage.

Packaging List

• 1 x KFD2-EB2.R4A.B redundant power feed module

• 1 x Product label set

• 1 x Quick start guide (multi-language)

Note: Cables, DIN rail, and termination accessories are sold separately.

Shipping Information

Carriers: FedEx, UPS, DHL.
All shipments include tracking and basic insurance. Expedited options available upon request.

Frequently Asked Questions (FAQ)

1. What happens if one input supply fails on the KFD2-EB2.R4A.B?
The module automatically switches to the healthy input. There is no interruption to the output current. Additionally, the fault relay changes state to signal the failure.

2. Can I use this redundant power feed module in Zone 2 hazardous areas?
Yes. The Pepperl+Fuchs KFD2-EB2.R4A.B is approved for Zone 2 (Ex nA nC IIC T4). It also carries Class I Division 2 certifications from FM, UL, and CSA.

3. How do I reset the fault output after a power loss?
The relay resets automatically once both inputs are restored and stable. No manual reset is required. However, check your system logic for any latching alarms.

4. What is the maximum distance between the module and its power supply?
Keep cable runs as short as possible to avoid voltage drop. For 24V DC systems, we recommend a maximum distance of 30 meters using 1.5 mm² wire.

5. Does the KFD2-EB2.R4A.B work with non-Pepperl+Fuchs power supplies?
Yes, as long as each supply provides 20-30V DC regulated output. The module is polarity-sensitive. Therefore always double-check terminal connections: 11+ / 12- and 8+ / 9-.